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Publications
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Articles
CGV Publications
Veröffentlichungen des CGV
2013 |
| Barmak, K., Eggeling, E., Kinderlehrer, D., Sharp, R., Ta'asan, S., Rollet, A.D. & Coffey, K., (2013), "Grain Growth and the Puzzle of its Stagnation in Thin Films: The Curious Tale of a Tail and an Ear", Progress in Materials Science, pp.195.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: The underlying cause of stagnation of grain growth in thin metallic films remains a puzzle. Here it is re-visited by means of detailed comparison of experiments and simulations, using a broad range of metrics that, in addition to grain size, includes the number of sides and the average side class of nearest neighbors. The experimental grain size data reported is large and comprises nearly 35,000 grains from 27 thin film samples of Al and Cu with thicknesses in the range of 25 to 158 nm. The size distributions for the Al and Cu films are remarkably similar to each other despite the many and significant differences in experimental conditions, which include sputtering target purity, substrate type, film thickness, deposition temperature, actual as well as homologous annealing temperatures, annealing time, absolute grain size, and the twin density within the grains. This similarity argues for a universal experimental grain size distribution, which for grain diameters is lognormal as found previously for thin films at stagnation. Comparison of the experimental grain size distribution with that for two dimensional grain growth simulations with isotropic boundary energy shows the distributions to differ in two regions, termed the "ear" and the "tail". It is shown that the excess small grains in the region of the "ear" are primarily the 3 and 4-sided grains, whereas the excess of large grains in the "tail" region are grains with more than 9 sides. The excesses in the ear and tail regions of the experimental distributions are necessarily balanced by a deficiency in the mid-sized grains with 6-8 sides. Five causes are examined to identify the puzzling difference between simulations with isotropic boundary energy and experiments. These are (i) driving forces other than grain boundary energy reduction, (ii) anisotropy of grain boundary energy, (iii) grain boundary grooving, (iv) solute drag and (v) triple junction drag. No single cause is seen to provide an explanation for the observed experimental behavior. However, it is speculated that a combination of causes that include the anisotropy of grain boundary energy will be needed to explain the experimental behavior. |
BibTeX:
@article{Barmak*13PMS,
author = {Barmak, Katayun and Eggeling, Eva and Kinderlehrer, David and Sharp, Richard and Ta'asan, S. and Rollet, Anthony D. and Coffey, Kevin},
title = {Grain Growth and the Puzzle of its Stagnation in Thin Films: The Curious Tale of a Tail and an Ear},
journal = {Progress in Materials Science},
year = {2013},
pages = {195},
doi = {http://dx.doi.org/10.1016/j.pmatsci.2013.03.004}
}
|
| Eggeling, E., Fellner, D.W., Halm, A. & Ullrich, T., (2013), "Optimization of an Autostereoscopic Display for a Driving Simulator", GRAPP 2013 - IVAPP 2013, pp.318-326, SciTePress, Portugal.
[Abstract] [BibTeX] [PDF] |
| Abstract: In this paper, we present an algorithm to optimize a 3D stereoscopic display based on parallax barriers for a driving simulator. The main purpose of the simulator is to enable user studies in reproducible laboratory conditions to test and evaluate driving assistance systems. The main idea of our optimization approach is to determine by numerical analysis the best pattern for an autostereoscopic display with the best image separation for each eye, integrated into a virtual reality environment. Our implementation uses a differential evolution algorithm, which is a parallel, direct search method based on evolution strategies, because it converges fast and is inherently parallel. This allows an execution on a network of computers. The resulting algorithm allows optimizing the display and its corresponding pattern, such that a single user in the simulator environment sees a stereoscopic image without being supported by special eye-wear. |
BibTeX:
@inproceedings{Eggeling*13GrappIvapp,
author = {Eggeling, Eva and Fellner, Dieter W. and Halm, Andreas and Ullrich, Torsten},
title = {Optimization of an Autostereoscopic Display for a Driving Simulator},
booktitle = {GRAPP 2013 - IVAPP 2013},
publisher = {SciTePress, Portugal},
year = {2013},
pages = {318-326}
}
|
| Eggeling, E., Fellner, D.W. & Ullrich, T., (2013), "Probability of Globality", World Academy of Science, Engineering and Technology, Vol.73, pp.483-487, WASET.
[Abstract] [BibTeX] [PDF] |
| Abstract: The objective of global optimization is to find the globally best solution of a model. Nonlinear models are ubiquitous in many applications and their solution often requires a global search approach; i.e. for a function $f$ from a set $A subset R^n$ to the real numbers, an element $x_0 in A$ is sought-after, such that $forall x in A : f(x_0) leq f(x)$. Depending on the field of application, the question whether a found solution $x_0$ is not only a local minimum but a global one is very important. This article presents a probabilistic approach to determine the probability of a solution being a global minimum. The approach is independent of the used global search method and only requires a limited, convex parameter domain $A$ as well as a Lipschitz continuous function $f$ whose Lipschitz constant is not needed to be known. |
BibTeX:
@inproceedings{Eggeling13*WASET,
author = {Eggeling, Eva and Fellner, Dieter W. and Ullrich, Torsten},
title = {Probability of Globality},
booktitle = {World Academy of Science, Engineering and Technology},
publisher = {WASET},
year = {2013},
volume = {73},
pages = {483-487}
}
|
| Pan, X., Schröttner, M., Havemann, S., Schiffer, T., Berndt, R., Hecher, M. & Fellner, D.W., (2013), "A Repository Infrastructure for Working with 3D Assets in Cultural Heritage", International Journal of Heritage in the Digital Era, Vol.2(1), pp.144-166.
[Abstract] [BibTeX] [PDF] |
| Abstract: The development of a European market for digital cultural heritage assets is impeded by the lack of a suitable digital marketplace, i.e., a commonly accepted exchange platform for digital assets. We have developed the technology for such a platform over the last two years: The 3D-COFORM Repository Infrastructure (RI) is a secure content management infrastructure for the distributed processing of large-volume datasets. Three of the key features of this system are (1) owners have complete control over their data, (2) binary data must have attached metadata, and (3) processing histories are documented. Our system can support the complete production pipeline for digital assets from data acquisition (photo, 3D scan) over processing (cleaning, whole filling) to interactive presentation and content delivery over the internet. In this paper we present the components of the system and their interplay. One particular focus of the software development was to make it as easy as possible toconnect client-side applications to the RI. Therefore we present the RIAPI in some detail and present several RI-enabled client-side applications that use it. |
BibTeX:
@article{Pan*13IJHDE,
author = {Pan, Xueming and Schröttner, Martin and Havemann, Sven and Schiffer, Thomas and Berndt, Rene and Hecher, Martin and Fellner, Dieter W.},
title = {A Repository Infrastructure for Working with 3D Assets in Cultural Heritage},
journal = {International Journal of Heritage in the Digital Era},
year = {2013},
volume = {2},
number = {1},
pages = {144-166}
}
|
| Peña Serna, S., Stork, A. & Fellner, D.W., (2013), "Embodiment Discrete Processing", Smart Product Engineering, pp.421-429, Springer, Berlin, Heidelberg, New York.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: The phases of the embodiment stage are sequentially conceived and in some domains even cyclic conceived. Nevertheless, there is no seamless integration between these, causing longer development processes, increment of time lags, loss of inertia, greater misunderstandings, and conflicts. Embodiment Discrete Processing enables the seamless integration of three building blocks. 1) Dynamic Discrete Representation: it is capable to concurrently handle the design and the analysis phases. 2) Dynamic Discrete Design: it deals with the needed modeling operations while keeping the consistency of the discrete shape. 3) Dynamic Discrete Analysis: it efficiently maps the dynamic changes of the shape within the design phase, while streamlining the interpretation processes. These integrated building blocks support the multidisciplinary work between designers and analysts, which was previously unusual. It creates a new understanding of what an integral processing is, whose phases were regarded as independent. Finally, it renders new opportunities toward a general purpose processing. |
BibTeX:
@inproceedings{PenaSerna*13LNPE,
author = {Peña Serna, Sebastian and Stork, André and Fellner, Dieter W.},
title = {Embodiment Discrete Processing},
booktitle = {Smart Product Engineering},
publisher = {Springer, Berlin, Heidelberg, New York},
year = {2013},
pages = {421-429},
doi = {http://dx.doi.org/10.1007/978-3-642-30817-8 41}
}
|
| Schwenk, K., Behr, J. & Fellner, D.W., (2013), "Filtering Noise in Progressive Stochastic Ray Tracing: Four Optimizations to Improve Speed and Robustness", The Visual Computer, Vol.29(5), pp.359-368.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present an improved version of a state-of-theart noise reduction technique for progressive stochastic rendering. Our additions make the method significantly faster at the cost of an acceptable loss in quality. Additionally, we improve the robustness of the method in the presence of difficult features like glossy reflection, caustics, and antialiased edges. We show with visual and numerical comparisons that our extensions improve the overall performance of the original approach and make it more broadly applicable. |
BibTeX:
@article{Schwenk*13VisComput,
author = {Schwenk, Karsten and Behr, Johannes and Fellner, Dieter W.},
title = {Filtering Noise in Progressive Stochastic Ray Tracing: Four Optimizations to Improve Speed and Robustness},
journal = {The Visual Computer},
year = {2013},
volume = {29},
number = {5},
pages = {359-368},
doi = {http://dx.doi.org/10.1007/s00371-012-0738-4}
}
|
| Ullrich, T., Schinko, C., Schiffer, T. & Fellner, D.W., (2013), "Procedural descriptions for analyzing digitized artifacts", Applied Geomatics, pp.to appear. |
| Abstract: Within the last few years, generative modeling techniques have gained attention especially in the context of cultural heritage. As a generative model describes a rather ideal object than a real one, generative techniques are a basis for object description and classification. This procedural knowledge differs from other kinds of knowledge, such as declarative knowledge, in a significant way: It is an algorithm, which reflects the way objects are designed. Consequently, generative models are not a replacement for established geometry descriptions (based on points, triangles, etc.) but a semantic enrichment. In combination with variance analysis techniques, generative descriptions can be used to validate reconstructions. Detailed mesh comparisons can reveal smallest changes and damages. These analysis and documentation tasks are needed not only in the context of cultural heritage but also in engineering and manufacturing. Our contribution to this problem is a work flow, which automatically combines generative/procedural descriptions with reconstructed artifacts and performs a nominal/actual value comparison. The reference surface is a procedural model whose accuracy and systematics describe the semantic properties of an object, whereas the actual object is a real-world data set (laser scan or photogrammetric reconstruction) without any additional semantic information. |
BibTeX:
@article{Ullrich*13AG,
author = {Torsten Ullrich and Christoph Schinko and Thomas Schiffer and Dieter W. Fellner },
title = {Procedural descriptions for analyzing digitized artifacts},
journal = {Applied Geomatics},
year = {2013},
pages = {to appear},
doi = {http://dx.doi.org/10.1007/s12518-013-0107-7}
}
|
| Weber, D., Bender, J., Schnös, M., Stork, A. & Fellner, D.W., (2013), "Efficient GPU Data Structures and Methods to Solve Sparse Linear Systems in Dynamics Applications", Computer Graphics Forum, Vol.32(1), pp.16-26.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present graphics processing unit (GPU) data structures and algorithms to efficiently solve sparse linear systems that are typically required in simulations of multi-body systems and deformable bodies. Thereby, we introduce an efficient sparse matrix data structure that can handle arbitrary sparsity patterns and outperforms current state-of-the-art implementations for sparse matrix vector multiplication. Moreover, an efficient method to construct global matrices on the GPU is presented where hundreds of thousands of individual element contributions are assembled in a few milliseconds. A finite-element-based method for the simulation of deformable solids as well as an impulse-based method for rigid bodies are introduced in order to demonstrate the advantages of the novel data structures and algorithms. These applications share the characteristic that a major computational effort consists of building and solving systems of linear equations in every time step. Our solving method results in a speed-up factor of up to 13 in comparison to other GPU methods. |
BibTeX:
@article{Weber*13CGF,
author = {Weber, Daniel and Bender, Jan and Schnös, Markus and Stork, André and Fellner, Dieter W.},
title = {Efficient GPU Data Structures and Methods to Solve Sparse Linear Systems in Dynamics Applications},
journal = {Computer Graphics Forum},
year = {2013},
volume = {32},
number = {1},
pages = {16-26},
doi = {http://dx.doi.org/10.1111/j.1467-8659.2012.03227.x}
}
|
2012 |
| Barmak, K., Eggeling, E., Emelianenko, M., Epshteyn, Y., Kinderlehrer, D., Ta'asan, S. & Sharp, R., (2012), "A first approach toward a Proper Generalized Decomposition", Discrete and continuous dynamical systems (Series A 30), Vol.715-716, pp.279-285. |
BibTeX:
@article{Barmak*12MCF,
author = {K. Barmak and E. Eggeling and M. Emelianenko and Y. Epshteyn and D. Kinderlehrer and S. Ta'asan and R. Sharp},
title = {A first approach toward a Proper Generalized Decomposition},
journal = {Discrete and continuous dynamical systems (Series A 30)},
year = {2012},
volume = {715-716},
pages = {279-285},
doi = {http://dx.doi.org/10.4028/www.scientific.net/MSF.715-716.279}
}
|
| Barmak, K., Eggeling, E., Sharp, R., Roberts, S., Shyu, T., Sun, T., Yao, B., Ta'asan, S., Kinderlehrer, D., Rollett, A.D. & Coffey, K., (2012), "Grain Growth and the Puzzle of its Stagnation in Thin Films: A Detailed Comparison of Experiments and Simulations", Materials Science Forum, Vol.715-716, pp.473-479. |
BibTeX:
@article{Barmak*12MSF,
author = {Katayun Barmak and Eva Eggeling and Richard Sharp and Scott Roberts and Terry Shyu and Tik Sun and Bo Yao and Shlomo Ta'asan and David Kinderlehrer and Anthony D. Rollett and Kevin Coffey},
title = {Grain Growth and the Puzzle of its Stagnation in Thin Films: A Detailed Comparison of Experiments and Simulations},
journal = {Materials Science Forum},
year = {2012},
volume = {715-716},
pages = {473-479},
doi = {http://dx.doi.org/10.4028/www.scientific.net/MSF.715-716.473}
}
|
| Barmak, K., Eggeling, E., Emelianenko, M., Epshteyn, Y., Kinderlehrer, D., Sharp, R. & Ta'asan, S., (2012), "Predictive Theory for the Grain Boundary Character Distribution", Materials Science Forum, Vol.715-716, pp.279-285. |
BibTeX:
@article{Barmak*12MSF-2,
author = {Barmak, Katayun and Eggeling, Eva and Emelianenko, Maria and Epshteyn, Yekaterina and Kinderlehrer, David and Sharp, Richard and Ta'asan, Shlomo},
title = {Predictive Theory for the Grain Boundary Character Distribution},
journal = {Materials Science Forum},
year = {2012},
volume = {715-716},
pages = {279-285},
doi = {http://dx.doi.org/10.4028/www.scientific.net/MSF.715-716.279}
}
|
| Bein, M., Peña Serna, S., Stork, A. & Fellner, D.W., (2012), "Completing Digital Cultural Heritage Objects by Sketching Subdivision Surfaces toward Restoration Planning", Progress in Cultural Heritage Preservation, Vol.7616, pp.301-309, Springer, Berlin, Heidelberg, New York. |
| Abstract: In the restoration planning process a curator evaluates the condition of a Cultural Heritage (CH) object and accordingly develops a set of hypotheses for improving it. This iterative process is complex, time consuming and requires many manual interventions. In this context, we propose interactive modeling techniques, based on subdivision surfaces, which can support the completion of CH objects toward restoration planning. The proposed technique starts with a scanned and incomplete object, represented by a triangle mesh, from which a subdivision surfaces can be generated. Based on the mixed representation, sketching techniques and modeling operations can be combined to extend and refine the subdivision surface, according to the curator's hypothesis. Thus, curators without rigorous modeling experience can directly create and manipulate surfaces in a similar way as they would do it on a piece of paper. We present the capabilities of the proposed technique on two interesting CH objects. |
BibTeX:
@inproceedings{Bein*12lncs,
author = {Bein, Matthias and Peña Serna, Sebastian and Stork, André and Fellner, Dieter W.},
title = {Completing Digital Cultural Heritage Objects by Sketching Subdivision Surfaces toward Restoration Planning},
booktitle = {Progress in Cultural Heritage Preservation},
publisher = {Springer, Berlin, Heidelberg, New York},
year = {2012},
volume = {7616},
pages = {301-309},
doi = {http://dx.doi.org/10.1007/978-3-642-34234-9_30}
}
|
| Bender, J., Kuijper, A., Fellner, D.W. & Guérin, E. (ed.) (2012), "VRIPHYS 12: 9th Workshop in Virtual Reality Interactions and Physical Simulations", Eurographics Association, Goslar. |
BibTeX:
@proceedings{Bender*12VRIPHYS,,
editor = {Bender, Jan and Kuijper, Arjan and Fellner, Dieter W. and Guérin, Eric},
title = {VRIPHYS 12: 9th Workshop in Virtual Reality Interactions and Physical Simulations},
publisher = {Eurographics Association, Goslar},
year = {2012}
}
|
| Berndt, R., Schinko, C., Krispel, U., Settgast, V., Havemann, S., Eggeling, E. & Fellner, D.W., (2012), "Ring's Anatomy -- Parametric Design of Wedding Rings", CONTENT 2012, pp.72-78, Xpert Publishing Services, Wilmington, USA.
[Abstract] [BibTeX] [PDF] |
| Abstract: We present a use case that demonstrates the effectiveness of procedural shape modeling for mass customization of consumer products. We show a metadesign that is composed of a few well-defined procedural shape building blocks. It can generate a large variety of shapes and covers most of a design space defined by a collection of exemplars, in our case wedding rings. We describe the process of model abstraction for the shape space spanned by these shapes, arguing that the same is possible for other shape design spaces as well. |
BibTeX:
@inproceedings{Berndt*12content,
author = {René Berndt and Christoph Schinko and Ulrich Krispel and Volker Settgast and Sven Havemann and Eva Eggeling and Dieter W. Fellner},
title = {Ring's Anatomy -- Parametric Design of Wedding Rings},
booktitle = {CONTENT 2012},
publisher = {Xpert Publishing Services, Wilmington, USA},
year = {2012},
pages = {72-78}
}
|
| Berndt, R., Blümel, I., Sens, I., Clausen, M., Damm, D., Klein, R., Thomas, V., Wessel, R., Diet, Jü., Fellner, D.W. & Scherer, M., (2012), "PROBADO -- A Digital Library System for Heterogeneous Non-textual Documents", Eleed Journal, Vol.8(1), pp.5 p.
[BibTeX] [PDF] |
BibTeX:
@article{Berndt*12eleed,
author = {Berndt, René and Blümel, Ina and Sens, Irina and Clausen, Michael and Damm, David and Klein, Reinhard and Thomas, Verena and Wessel, Raoul and Diet, Jürgen and Fellner, Dieter W. and Scherer, Maximilian },
title = {PROBADO -- A Digital Library System for Heterogeneous Non-textual Documents},
journal = {Eleed Journal},
year = {2012},
volume = {8},
number = {1},
pages = {5 p},
note = {available from http://nbn-resolving.de/urn:nbn:de:0009-5-32740}
}
|
| Bremm, S., Heß, M., Landesberger, T. v. & Fellner, D.W., (2012), "PCDC -- On the Highway to Data. A Tool for the Fast Generation of Large Synthetic Data Sets", EuroVA 2012, pp.7-11, Eurographics Association, Goslar.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: In this paper, we present Parallel Coordinates for Data Creation (PCDC), a new visual-interactive method for the fast generation of labeled multidimensional data sets. Multivariate data need to be analyzed in various domains such as finance, biology or medicine using complex data mining techniques. For the evaluation or presentation of the techniques, e.g., for assessing their sensitivity to specific data properties, test data need to be generated. PCDC allows for a fast and intuitive creation of multivariate data with several classes. It is based on interactive definition of data regions and data distributions in a parallel coordinates view. It offers a quick definition of data regions over several dimensions in one interface. Moreover, the users can directly see the outcome of their settings in the same view without the need for switching between data generation and output visualization. Our tool enables also an easy adjustment of the data generation parameters for creating additional similar datasets. |
BibTeX:
@inproceedings{Bremm*12EuroVA,
author = {Bremm, Sebastian and Heß, Martin and Landesberger, Tatiana von and Fellner, Dieter W.},
title = {PCDC -- On the Highway to Data. A Tool for the Fast Generation of Large Synthetic Data Sets},
booktitle = {EuroVA 2012},
publisher = {Eurographics Association, Goslar},
year = {2012},
pages = {7-11},
doi = {http://dx.doi.org/10.2312/PE/EuroVAST/EuroVA12/007-011}
}
|
| Brix, T., Fellner, D.W., Krämer, B.J. & Schrader, T., (2012), "Workshop: Centers of Excellence for Research Information -- Digital Text and Data Centers for Science and Open Research", Eleed Journal, Vol.8(1), pp.2 p.
[BibTeX] [PDF] |
BibTeX:
@article{Brix*12eleed,
author = {Brix, T. and Fellner, Dieter W. and Krämer, Berndt J. and Schrader, T. },
title = {Workshop: Centers of Excellence for Research Information -- Digital Text and Data Centers for Science and Open Research},
journal = {Eleed Journal},
year = {2012},
volume = {8},
number = {1},
pages = {2 p},
note = {available from http://nbn-resolving.de/urn:nbn:de:0009-5-32732}
}
|
| Fellner, D.W., Baier, K., Dürre, S., Melanie, Bornemann, H. & Mentel, K. (ed.) (2012), "Jahresbericht 2011: Fraunhofer-Institut für Graphische Datenverarbeitung IGD", Fraunhofer-Institut für Graphische Datenverarbeitung (IGD). |
BibTeX:
@book{Fellner*12ar-igd,,
editor = {Fellner, Dieter W. and Baier, Konrad and Dürre, Steffen and Melanie and Bornemann, Heidrun and Mentel, Katrin},
title = {Jahresbericht 2011: Fraunhofer-Institut für Graphische Datenverarbeitung IGD},
publisher = {Fraunhofer-Institut für Graphische Datenverarbeitung (IGD)},
year = {2012},
note = {58 S.}
}
|
| Fellner, D.W., (2012), "Informatik und Open Access -- von der idealistischen Sicht zum umsetzbaren oldenen Weg", Informatik Spektrum, Vol.35(4), pp.250-252.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Der erweiterte Vorstand der GI zeichnet regelmäßig im Informatik-Spektrum für eine Kolumne verantwortlich, in der aktuelle Themen der Informatik zur Diskussion gestellt werden. Die Texte eröffnen Perspektiven auf aktuelle Fragen, die Informatiker und Informatikerinnen betreffen. Im vorliegenden Heft betrachtet Prof. Fellner, Mitglied des erweiterten Vorstands der GI, Open Access im Kontext des wissenschaftlichen Publizierens. |
BibTeX:
@article{Fellner12infspect,
author = {Dieter W. Fellner},
title = {Informatik und Open Access -- von der idealistischen Sicht zum umsetzbaren oldenen Weg},
journal = {Informatik Spektrum},
year = {2012},
volume = {35},
number = {4},
pages = {250-252},
doi = {http://dx.doi.org/10.1007/s00287-012-0632-5}
}
|
| Franke, T., Olbrich, M. & Fellner, D.W., (2012), "A Flexible Approach to Gesture Recognition and Interaction in X3D", Proceedings Web3D 2012, pp.171-174, ACM Press, New York.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: With the appearance of natural interaction devices such as the Microsoft Kinect or Asus Xtion PRO cameras, a whole new range of interaction modes have been opened up to developers. Tracking frameworks can make use of the additional depth image or skeleton tracking capabilities to recognize gestures. A popular example of one such implementation is the NITE framework from PrimeSense, which enables fine grained gesture recognition. However, recognized gestures come with additional information such as velocity, angle or accuracy, which are not encapsulated in a standardized format and therefore cannot be integrated into X3D in a meaningful way. In this paper, we propose a flexible way to inject gesture based meta data into X3D applications to enable fine grained interaction. We also discuss how to recognize these gestures if the underlying framework provides no mechanism to do so. |
BibTeX:
@inproceedings{Franke*12web3D,
author = {Franke, Tobias and Olbrich, Manuel and Fellner, Dieter W.},
title = {A Flexible Approach to Gesture Recognition and Interaction in X3D},
booktitle = {Proceedings Web3D 2012},
publisher = {ACM Press, New York},
year = {2012},
pages = {171-174},
doi = {http://dx.doi.org/10.1145/2338714.2338743}
}
|
| Franke, T. & Fellner, D.W., (2012), "A Scalable Framework for Image-based Material Representations", Proceedings Web3D 2012, pp.83-91, ACM Press, New York.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Complex material-light interaction is modeled mathematically in its most basic form through the 4D BRDF or the 6D spatially varying BRDF. To alleviate the overhead of calculating correct shading with a complex BRDF consisting of many parameters, many methods resort to textures as containers for BRDF information. The most common among them is the Bidirectional Texture Function, where a set of base textures of the material under different illumination and viewing conditions is stored and used as a lookup table at runtime. A wide variety of compression algorithms have been proposed, which usually differ only in some basis notation. Also, several other schemes aside from the BTF exist that make use of multiple textures as containers for surface appearance data, which either compress the surface transfer function or the response in change of luminance with a suitable basis function. We propose a common container for image-based material descriptors, the Image Material node for X3D, with a common interface to unify these different implementations and make them accessible to the X3D developer. We also introduce a new texturing node, the PolynomialTextureMap, which can display Polynomial Texture Map binary container as regular static texture or work in conjunction with an ImageMaterial appearance to unfold its full potential. |
BibTeX:
@inproceedings{Franke-Fellner*12web3D,
author = {Franke, Tobias and Fellner, Dieter W.},
title = {A Scalable Framework for Image-based Material Representations},
booktitle = {Proceedings Web3D 2012},
publisher = {ACM Press, New York},
year = {2012},
pages = {83-91},
doi = {http://dx.doi.org/10.1145/2338714.2338727}
}
|
| Halm, A., Eggeling, E. & Fellner, D.W., Linsen, L., Hagen, H., Hamann, B. & Hege, H.-C. (ed.) (2012), "Embedding Biomolecular Information in a Scene Graph System", Visualization in Medicine and Life Sciences II, pp.249-264, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present the Bio Scene Graph (BioSG) for visualization of biomolecular structures based on the scene graph system OpenSG. The hierarchical model of primary, secondary and tertiary structures of molecules used in the organic chemistry is mapped to a graph of nodes when loading molecular files. We show that using BioSG, displaying molecules can be integrated in other applications, for example in medical applications. Additionally, existing algorithms and programs can be easily adapted to display the results with BioSG. |
BibTeX:
@incollection{Halm*12vmls,
author = {Andreas Halm and Eva Eggeling and Dieter W. Fellner},
editor = {Lars Linsen and Hans Hagen and Bernd Hamann and Hans-Christian Hege},
title = {Embedding Biomolecular Information in a Scene Graph System},
booktitle = {Visualization in Medicine and Life Sciences II},
publisher = {Springer},
year = {2012},
pages = {249-264},
doi = {http://dx.doi.org/10.1007/978-3-642-21608-4_14}
}
|
| Havemann, S., Ullrich, T. & Fellner, D., Maybury, M. (ed.) (2012), "The Meaning of Shape and Some Techniques to Extract It", Multimedia Information Extraction: Advances in Video, Audio, and Imagery Analysis for Search, Data Mining, Surveillance, and Authoring, pp.81-98, Wiley-IEEE Computer Society Press.
[Abstract] [BibTeX] [PDF] |
| Abstract: This chapter aims at highlighting some of the fundamental but maybe less obvious limitations of current methods for representing and processing 3D shape, and suggests some possible solutions. We introduce semantic enrichment as central concept relating the subjective nature of interpretation to the objective of classification. Besides a survey on more traditional approaches for extracting semantics from shape (e.g., structural recognition), we also present more far-fetching generative approaches. Their contribution is twofold: A scalable solution for model-based production of new models, and information extraction from existing models by means of automated fitting procedures. We illustrate these concepts with two very active and extremely challenging application domains, urban reconstruction and cultural heritage. |
BibTeX:
@incollection{Havemann*12mmie,
author = {Sven Havemann and Torsten Ullrich and Dieter Fellner},
editor = {Mark Maybury},
title = {The Meaning of Shape and Some Techniques to Extract It},
booktitle = {Multimedia Information Extraction: Advances in Video, Audio, and Imagery Analysis for Search, Data Mining, Surveillance, and Authoring},
publisher = {Wiley-IEEE Computer Society Press},
year = {2012},
pages = {81-98}
}
|
| Havemann, S., Baker, D., Bentkowska-Kafel, A. & Denard, H. (ed.) (2012), "Intricacies and Potentials of Collecting Paradata in the 3D Modelling Workflow", Paradata. Intellectual Transparency in Historical Visualization, pp.154-162, Ashgate.
[Abstract] [BibTeX] [PDF] |
| Abstract: A 3D artefact is supposed to be a faithful recording and documentation of reality. However, unlike taking a photograph, the creation of a 3D artefact is not only a matter of activating a sensor that takes samples of reality, e.g., pixel colours arranged in a regular grid. Instead of being a simple measurement, the 3D modelling workflow takes the measured raw data (3D acquisition) and transforms and combines them through a number of processing steps. They typically involve a number of sophisticated geometric algorithms, some of which are outlined below. This qualifies indeed for the name 3D modelling: 3D artefact creation is much more than just 3D acquisition. In many cases, in particular when high-quality results are requested, the human is also in the loop. Highly skilled and trained 3D operators fill holes in the models, remove scanning deficiencies, and use interactive tools to optimize the surface quality. The great problem with this approach is the loss of authenticity: with the finished 3D artefact it is no longer possible to clearly distinguish between measured data and data that are 'invented' by 3D modelling algorithms. Furthermore, current 3D technology has some inherent limitations that make it principally impossible to collect, along the modelling process, the paradata that would allow assessment of the authenticity of datasets on the basis of individual triangles. It is argued here that a new type of 3D technology is required: a set of algorithms, data structures, and policies that are respected and implemented by all software tools used in the 3D modelling tool chain. Some essential requirements are formulated, and in some cases interesting new ways are indicated how these requirements could be implemented to obtain practical solutions to the problem of collecting paradata during the creation of 3D artefacts. |
BibTeX:
@incollection{Havemann10paradata,
author = {Sven Havemann},
editor = {Drew Baker and Anna Bentkowska-Kafel and Hugh Denard},
title = {Intricacies and Potentials of Collecting Paradata in the 3D Modelling Workflow},
booktitle = {Paradata. Intellectual Transparency in Historical Visualization},
publisher = {Ashgate},
year = {2012},
pages = {154-162}
}
|
| Hecher, M., Möstl, R., Eggeling, E., Derler, C. & Fellner, D.W., Baptista, A.A., Linde, P., Lavesson, N. & de Brito, M.A. (ed.) (2012), "'Tangible Culture' -- Designing Virtual Exhibitions on Multi-Touch Devices", Social Shaping of Digital Publishing: Exploring the Interplay Between Culture and Technology, ELPUB 2012, pp.104-113, IOS Press.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Cultural heritage institutions such as galleries, museums and libraries increasingly use digital media to present artifacts to their audience and enable them to immerse themselves in a cultural virtual world. With the application eXhibition: editor3D museum curators and editors have a software tool at hand to interactively plan and visualize exhibitions. In this paper we present an extension to the application that enhances the workflow when designing exhibitions. By introducing multi-touch technology to the graphical user interfaces the designing phase of an exhibition is efficiently simplified, especially for non-technical users. Furthermore, multi-touch technology offers a novel way of collaborative work to be integrated into a decision making process. A flexible export system allows to store created exhibitions in various formats to display them on websites, mobile devices or custom viewers. E.g. the widespread 3D scene standard Extensible 3D (X3D) is one of the export formats and we use it to directly incorporate a realtime preview of the exhibition in the authoring process. The combination of the tangible user interfaces with the realtime preview gives curators and exhibition planers a capable tool for efficiently presenting cultural heritage in electronic media. |
BibTeX:
@inproceedings{Hecher*12elpub,
author = {Hecher, Martin and Möstl, Robert and Eggeling, Eva and Derler, Christian and Fellner, Dieter W.},
editor = {Ana Alice Baptista and Peter Linde and Niklas Lavesson and Miguel Abrunhosa de Brito},
title = {'Tangible Culture' -- Designing Virtual Exhibitions on Multi-Touch Devices},
booktitle = {Social Shaping of Digital Publishing: Exploring the Interplay Between Culture and Technology, ELPUB 2012},
publisher = {IOS Press},
year = {2012},
pages = {104-113},
doi = {http://dx.doi.org/10.3233/978-1-61499-065-9-104}
}
|
| Hecher, M., Möstl, R., Eggeling, E. & Derler, C., Schenk, M. (ed.) (2012), "angible Culture-- Designing Virtual Exhibitions on Multi-Touch Devices", 15. IFF-Wissenschaftstage 2012. 'Digitales Engineering zum Planen, Testen und Betreiben technischer Systeme' , pp.237-243, Fraunhofer Verlag. |
BibTeX:
@inproceedings{Hecher*12iff,
author = {Hecher, Martin and Möstl, Robert and Eggeling, Eva and Derler, Christian},
editor = {Schenk, Michael},
title = {angible Culture-- Designing Virtual Exhibitions on Multi-Touch Devices},
booktitle = {15. IFF-Wissenschaftstage 2012. 'Digitales Engineering zum Planen, Testen und Betreiben technischer Systeme' },
publisher = {Fraunhofer Verlag},
year = {2012},
pages = {237-243}
}
|
| Kuijper, A., Sourin, A. & Fellner, D.W. (ed.) (2012), "2012 International Conference on Cyberworlds. Proceedings", IEEE Computer Society Conference Publishing Services (CPS), Los Alamitos, Calif.. |
| Abstract: Created intentionally or spontaneously, cyberworlds are information spaces and communities that immensely augment the way we interact, participate in business and receive information throughout the world. Cyberworlds seriously impact our lives and the evolution of the world economy by taking such forms as social networking services, 3D shared virtual communities and massively multiplayer online role-playing games. Cyberworlds 2012 was held 25-27 September 2012 and was organized by Fraunhofer IGD and TU Darmstadt, Germany, in cooperation with EUROGRAPHICS Association and supported by the IFIP Workgroup Computer Graphics and Virtual Worlds. |
BibTeX:
@proceedings{Kuijper*2012CW,,
editor = {Kuijper, Arjan and Sourin, Alexei and Fellner, Dieter W.},
title = {2012 International Conference on Cyberworlds. Proceedings},
publisher = {IEEE Computer Society Conference Publishing Services (CPS), Los Alamitos, Calif.},
year = {2012},
note = {available from http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=6336442},
doi = {http://dx.doi.org/10.1109/CW.2012.59}
}
|
| Landesberger, T. v., Schreck, T., Fellner, D.W. & Kohlhammer, Jö., (2012), "Visual Search and Analysis in Complex Information Spaces -- Approaches and Research Challenges", Expanding the Frontiers of Visual Analytics and Visualization, pp.45-67, Springer, Berlin, Heidelberg, New York. |
| Abstract: One of the central motivations for visual analytics research is the so-called information overload - implying the challenge for human users in understanding and making decisions in presence of too much information [37]. Visual-interactive systems, integrated with automatic data analysis techniques, can help in making use of such large data sets [35]. Visual Analytics solutions not only need to cope with data volumes that are large on the nominal scale, but also with data that show high complexity. Important characteristics of complex data are that the data items are difficult to compare in a meaningful way based on the raw data. Also, the data items may be composed of different base data types, giving rise to multiple analytical perspectives. Example data types include research data compound of several base data types, multimedia data composed of different media modalities, etc. In this paper, we discuss the role of data complexity for visual analysis and search, and identify implications for designing respective visual analytics applications. We first introduce a data complexity model, and present current example visual analysis approaches based on it, for a selected number of complex data types. We also outline important research challenges for visual search and analysis we deem important. |
BibTeX:
@incollection{Landesberger*12efvav,
author = {Landesberger, Tatiana von and Schreck, Tobias and Fellner, Dieter W. and Kohlhammer, Jörn},
title = {Visual Search and Analysis in Complex Information Spaces -- Approaches and Research Challenges},
booktitle = {Expanding the Frontiers of Visual Analytics and Visualization},
publisher = {Springer, Berlin, Heidelberg, New York},
year = {2012},
pages = {45-67},
doi = {http://dx.doi.org/10.1007/978-1-4471-2804-5 4}
}
|
| Pan, X., Schiffer, T., Schröttner, M., Berndt, R., Hecher, M., Havemann, S. & Fellner, D.W., (2012), "An Enhanced Distributed Repository for Working with 3D Assets in Cultural Heritage", Progress in Cultural Heritage Preservation, Vol.7616, pp.349-358, Springer, Berlin, Heidelberg, New York.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: The development of a European market for digital cultural heritage assets is impeded by the lack of a suitable marketplace, i.e., a commonly accepted distributed exchange platform for digital assets. We have developed such a platform over the last two years, a centralized content management system with distributed storage capability and semantic query functionality. It supports the complete pipeline from data acquisition (photo, 3D scan) over processing (cleaning, hole filling) to interactive presentation, and allows collecting a complete process description (paradata) alongside. In this paper we present the components of the system and explain their interplay. Furthermore, we present and explain which functional components, from transactions to permission management, are needed to operate the system. Finally, we prove the suitability of the API and present a few software applications that use it. |
BibTeX:
@inproceedings{Pan*12lncs,
author = {Pan, Xueming and Schiffer, Thomas and Schröttner, Martin and Berndt, Rene and Hecher, Martin and Havemann, Sven and Fellner, Dieter W.},
title = {An Enhanced Distributed Repository for Working with 3D Assets in Cultural Heritage},
booktitle = {Progress in Cultural Heritage Preservation},
publisher = {Springer, Berlin, Heidelberg, New York},
year = {2012},
volume = {7616},
pages = {349-358},
doi = {http://dx.doi.org/10.1007/978-3-642-34234-9_35}
}
|
| Pan, X., Schiffer, T., Hecher, M., Havemann, S., Berndt, R., Fellner, D.W. & Schröttner, M., (2012), "A Scalable Repository Infrastructure for CH Digital Object Management", Proceedings of the VSMM 2012, pp.219-226, IEEE.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: In recent decades, researchers of archaeological 3D digitalization found that the collection and archive of processing intermediate data are extremely tiresome tasks. They need large of man power and material resources, even though, mistakes can be raised and break the whole working chain. The traditional documentation of digitalization process is also a pending challenge, although, the ISO standard CIDOC-CRM (ISO 21127:2006) has been introduced to the archaeologists and museum professionals since years, but there are still some obvious gaps between practice and theory: (1) How to connect the discrete archaeologists, museums, CH research institutions, and the public? (2) How to ensure the integrity of whole digitalization process and simplify the process? (3) How to maximize the usability of the public digital objects in CH community? (4) How to long term preserve the huge amount of datasets? (5) How to present and disseminate the digital object to the public? This paper presents an operational and optimal infrastructure that realizes not only a distributed storage system, but also a content management system. This infrastructure works as a backbone of whole digitalization process, provides a complete solution suite for archaeologists, museum professionals, museum visitors, and IT technicians. |
BibTeX:
@inproceedings{Pan*12vsmm,
author = {Pan, Xueming and Schiffer, Thomas and Hecher, Martin and Havemann, Sven and Berndt, René and Fellner, Dieter W. and Schröttner, Martin},
title = {A Scalable Repository Infrastructure for CH Digital Object Management},
booktitle = {Proceedings of the VSMM 2012},
publisher = {IEEE},
year = {2012},
pages = {219-226},
doi = {http://dx.doi.org/10.1109/VSMM.2012.6365928}
}
|
| Peter, C. & Urban, B., Dill, J., Earnshaw, R., Kasik, D., Vince, J. & Wong, P. (ed.) (2012), "Emotion in Human-Computer Interaction", Expanding the Frontiers of Visual Analytics and Visualization Expanding the Frontiers of Visual Analytics and Visualization, pp.239-262, Springer. |
| Abstract: Affect and emotion are probably the most important facets of our lives. They make our lives worth living by enabling us to enjoy experiences, to value the behavior of others and helping us to make decisions more easily. They enforce or fade out the memory of distinct events and make some of them unique in the sequence of episodes that we undergo each day. But also, they function as a modulator of information when interacting with other people and play an essential role in fine-tuning our communication. The ability to express and understand emotional signs can hence be considered vital for interacting with human beings. Leveraging the power of emotion recognition to enhance technology seems obligatory when designing technology for people. This chapter introduces the physiological background of emotion recognition, describes the general approach to detecting emotion using physiological sensors, and gives two examples of affective applications. |
BibTeX:
@incollection{Peterurban*12springer,
author = {C. Peter and B. Urban},
editor = {J. Dill and R. Earnshaw and D. Kasik and J. Vince and P.C. Wong},
title = {Emotion in Human-Computer Interaction},
booktitle = {Expanding the Frontiers of Visual Analytics and Visualization Expanding the Frontiers of Visual Analytics and Visualization},
publisher = {Springer},
year = {2012},
pages = {239-262},
doi = {http://dx.doi.org/10.1007/978-1-4471-2804-5_14}
}
|
| Riemenschneider, H., Krispel, U., Thaller, W., Donoser, M., Havemann, S., Fellner, D.W. & Bischof, H., (2012), "Irregular lattices for complex shape grammar facade parsing", IEEE Conference on Computer Vision and Pattern Recognition (CVPR), pp.1640-1647, IEEE.
[Abstract] [BibTeX] [PDF] |
| Abstract: High quality urban reconstruction requires more than multi-view reconstruction and local optimization. The structure of facades depends on the general layout, which has to be optimized as a global task. Shape grammars are an established method to express hierarchical spatial relationships, and are therefore suited as constraint of representation for semantic facade interpretation. Usually the inference is carried out using numerical approximations, or specifically tuned to a hard-coded grammar scheme. Existing methods inspired by classical grammar parsing are not practical on real-world images due to their prohibitively high complexity. This work provides feasible generic facade reconstruction by combining low-level classifiers with mid-level object detectors to infer an irregular lattice. The irregular lattice preserves the logical structure of the facade while reducing the search space to a manageable size. Furthermore, we introduce a method for handling symmetry and repetition within the grammar. We show competitive results on two datasets, namely the Paris2010 and the GT50. The former includes only Hausmannian, while the latter includes Baroque, Classicism, Historism, Renaissance, and Art Nouveau architectural styles. |
BibTeX:
@inproceedings{Riemenschneider*12cvpr,
author = {Riemenschneider, Hayko and Krispel, Ulrich and Thaller, Wolfgang and Donoser, Michael and Havemann, Sven and Fellner, Dieter W. and Bischof, Horst},
title = {Irregular lattices for complex shape grammar facade parsing},
booktitle = {IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
publisher = {IEEE},
year = {2012},
pages = {1640-1647}
}
|
| Schiffer, T. & und M. Demuth, F.A., (2012), "Computing Convex Quadrangulations", Discrete Applied Mathematics, pp.648-656. |
BibTeX:
@article{Schiffer*12DAM,
author = {T. Schiffer and F. Aurenhammer und M. Demuth},
title = {Computing Convex Quadrangulations},
journal = {Discrete Applied Mathematics},
year = {2012},
pages = {648-656},
doi = {http://dx.doi.org/10.1016/j.dam.2011.11.002}
}
|
| Schinko, C., Ullrich, T. & Dieter W., F., (2012), "Minimally Invasive Interpreter Construction", COMPUTATION TOOLS 2012, pp.38-44, Xpert Publishing Services, Wilmington, USA.
[Abstract] [BibTeX] [PDF] |
| Abstract: Scripting languages are easy to use and very popular in various contexts. Their simplicity reduces a user's threshold of inhibitions to start programming -- especially, if the user is not a computer science expert. As a consequence, our generative modeling framework Euclides for non-expert users is based on a JavaScript dialect. It consists of a JavaScript compiler including a front-end (lexer, parser, etc.) and backends for several platforms. In order to reduce our users' development times and for fast feedback, we integrated an interactive interpreter based on the already existing compiler. Instead of writing large proportions of new code, whose behavior has to be consistent with the already existing compiler, we used a minimally invasive solution, which allows us to reuse most parts of the compiler's front- and back-end. |
BibTeX:
@inproceedings{Schinko*12CT,
author = {Schinko, Christoph and Ullrich, Torsten and Dieter W., Fellner},
title = {Minimally Invasive Interpreter Construction},
booktitle = {COMPUTATION TOOLS 2012},
publisher = {Xpert Publishing Services, Wilmington, USA},
year = {2012},
pages = {38-44}
}
|
| Schröttner, M., Havemann, S., Theodoridou, M., Doerr, M. & Fellner, D.W., (2012), "A Generic Approach for Generating Cultural Heritage Metadata", Progress in Cultural Heritage Preservation, Vol.7616, pp.231-240, Springer, Berlin, Heidelberg, New York.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Rich metadata is crucial for the documentation and retrieval of 3D datasets in cultural heritage. Generating metadata is expensive as it is a very time consuming semi-manual process. The exponential increase of digital assets requires novel approaches for the mass generation of metadata. We present an approach that is generic, minimizes user assistance, and is customizable for different metadata schemes and storage formats as it is based on generic forms. It scales well and was tested with a large database of digital CH objects. |
BibTeX:
@inproceedings{Schroettner*12lncs,
author = {Schröttner, Martin and Havemann, Sven and Theodoridou, Maria and Doerr, Martin and Fellner, Dieter W.},
title = {A Generic Approach for Generating Cultural Heritage Metadata},
booktitle = {Progress in Cultural Heritage Preservation},
publisher = {Springer, Berlin, Heidelberg, New York},
year = {2012},
volume = {7616},
pages = {231-240},
doi = {http://dx.doi.org/10.1007/978-3-642-34234-9_23}
}
|
| Schwenk, K., Kuijper, A., Behr, J. & Fellner, D.W., (2012), "Practical Noise Reduction for Progressive Stochastic Ray Tracing with Perceptual Control", IEEE Computer Graphics and Applications, Vol.32(6), pp.46-55.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: A proposed method reduces noise in stochastic ray tracing for interactive progressive rendering. The method accumulates high-variance light paths in a separate buffer, which is filtered by a high-quality edge-preserving filter. Then, this method adds a combination of the noisy unfiltered samples and the less noisy (but biased) filtered samples to the low-variance samples to form the final image. A novel per-pixel blending operator combines both contributions in a way that respects a user-defined threshold on perceived noise. This method can provide fast, reliable previews, even in the presence of complex features such as specular surfaces and high-frequency textures. At the same time, it's consistent in that the bias due to filtering vanishes in the limit. |
BibTeX:
@article{Schwenk*12CGA,
author = {Schwenk, Karsten and Kuijper, Arjan and Behr, Johannes and Fellner, Dieter W.},
title = {Practical Noise Reduction for Progressive Stochastic Ray Tracing with Perceptual Control},
journal = {IEEE Computer Graphics and Applications},
year = {2012},
volume = {32},
number = {6},
pages = {46-55},
doi = {http://dx.doi.org/10.1109/MCG.2012.30}
}
|
| Settgast, V., Eggeling, E. & Fellner, D.W., Schenk, M. (ed.) (2012), "The Preparation of 3D-Content for Interactive Visualization", 15. IFF-Wissenschaftstage 2012, 'Digitales Engineering zum Planen, Testen und Betreiben technischer Systeme', Vol.9, pp.187-192, Fraunhofer Verlag, Stuttgart.
[BibTeX] [PDF] |
BibTeX:
@inproceedings{Settgast*12iff,
author = {Settgast, Volker and Eggeling, Eva and Fellner, Dieter W.},
editor = {Schenk, Michael},
title = {The Preparation of 3D-Content for Interactive Visualization},
booktitle = {15. IFF-Wissenschaftstage 2012, 'Digitales Engineering zum Planen, Testen und Betreiben technischer Systeme'},
publisher = {Fraunhofer Verlag, Stuttgart},
year = {2012},
volume = {9},
pages = {187-192}
}
|
| Settgast, V., Lancelle, M., Bauer, D. & Fellner, D.W., Geiger, C., Herder, J. & Vierjahn, T. (ed.) (2012), "Hands-Free Navigation in Immersive Environments for the Evaluation of the Effectiveness of Indoor Navigation Systems", Virtuelle und Erweiterte Realität : 9. Workshop der GI-Fachgruppe VR/AR, pp.107-118, Herzogenrath : Shaker.
[Abstract] [BibTeX] [PDF] |
| Abstract: While navigation systems for cars are in widespread use, only recently, indoor navigation systems based on smartphone apps became technically feasible. Hence tools in order to plan and evaluate particular designs of information provision are needed. Since tests in real infrastructures are costly and environmental conditions cannot be held constant, one must resort to virtual infrastructures. In this paper we present a hands-free navigation in such virtual worlds using the Microsoft Kinect in our four-sided Definitely Affordable Virtual Environment (DAVE). We designed and implemented navigation controls using the user's gestures and postures as the input to the controls. The installation of expensive and bulky hardware like treadmills is avoided while still giving the user a good impression of the distance she has travelled in virtual space. An advantage in comparison to approaches using head mounted augmented reality is that the DAVE allows the users to interact withtheir smartphone. Thus the effects of different indoor navigation systems can be evaluated already in the planning phase using the resulting system. |
BibTeX:
@inproceedings{Settgast*12VRAR,
author = {Settgast, Volker and Lancelle, Marcel and Bauer, Dietmar and Fellner, Dieter W.},
editor = {Christian Geiger and Jens Herder and Tom Vierjahn},
title = {Hands-Free Navigation in Immersive Environments for the Evaluation of the Effectiveness of Indoor Navigation Systems},
booktitle = {Virtuelle und Erweiterte Realität : 9. Workshop der GI-Fachgruppe VR/AR},
publisher = {Herzogenrath : Shaker},
year = {2012},
pages = {107-118}
}
|
| Stork, A. & Fellner, D.W., (2012), "3D-COFORM -- Tools and Expertise for 3D Collection Formation", Proceedings EVA 2012, pp.35-49, Gesellschaft zur Förderung angewandter Informatik e.V., Berlin. |
| Abstract: 3D-COFORM has the overall aim to make 3D documentation the standard approach in cultural heritage institutions for collection formation and management. 3D-COFORM is addressing the whole life cycle of digital 3D objects (also called 3D documents) spanning the whole chain from acquisition to processing, and from semantic enrichment to modeling and high-quality presentation -- all that on the basis of an integrated repository infrastructure. The paper will give an overview of 3D-COFORM and present its current results and contributions. |
BibTeX:
@inproceedings{Stork-Fellner*12EVA,
author = {Stork, André and Fellner, Dieter W.},
title = {3D-COFORM -- Tools and Expertise for 3D Collection Formation},
booktitle = {Proceedings EVA 2012},
publisher = {Gesellschaft zur Förderung angewandter Informatik e.V., Berlin},
year = {2012},
pages = {35-49}
}
|
| Thaller, W., Krispel, U., Havemann, S. & Fellner, D., Ullrich, T. & Lorenz, P. (ed.) (2012), "Implicit Nested Repetition in Dataflow for Procedural Modeling", COMPUTATION TOOLS 2012, pp.45-50, IARIA.
[Abstract] [BibTeX] [PDF] |
| Abstract: Creating 3D content requires a lot of expert knowledge and is often a very time consuming task. Procedural modeling can simplify this process for several application domains. However, creating procedural descriptions is still a complicated task. Graph based visual programming languages can ease the creation workflow, however direct manipulation of procedural 3D content rather than of a visual program is desirable as it resembles established techniques in 3D modeling. In this paper, we present a dataflow language that features a novel approach to handling loops in the context of direct interactive manipulation of procedural 3D models and show compilation techniques to translate it to traditional languages used in procedural modeling. |
BibTeX:
@inproceedings{Thaller*12CT,
author = {W. Thaller and U. Krispel and S. Havemann and D. Fellner},
editor = {T. Ullrich and P. Lorenz},
title = {Implicit Nested Repetition in Dataflow for Procedural Modeling},
booktitle = {COMPUTATION TOOLS 2012},
publisher = {IARIA},
year = {2012},
pages = {45-50}
}
|
| Weber, D., Peña Serna, S., Stork, A. & Fellner, D.W., (2012), "Schnelle Strömungsberechnungen mit GPU: Rapid CFD für die frühe konzeptionelle Designphase", Digital Engineering Magazin, Vol.15(5), pp.44-47.
[Abstract] [BibTeX] [PDF] |
| Abstract: Eine neue Tragfläche entsteht am Computer. Ist ihr Auftrieb tatsächlich besser als bei den herkömmlichen? Eine Computersimulation kann hierüber Aufschluss geben. Konventionelle Simulationen liefern die gewünschten Ergebnisse gewöhnlich erst nach mehreren Stunden oder Tagen. Erst anschließend können Modifikationen an der Geometrie vorgenommen werden, um die Eigenschaften zu verbessern. Ein neues Verfahren liefert nun die ersten Simulationsergebnisse bereits in Echtzeit. Es nutzt die Prozessoren der Grafikkarten (Graphics Processing Unit- GPU) für die notwendigen Berechnungen. |
BibTeX:
@article{Weber*12DEM,
author = {Weber, Daniel and Peña Serna, Sebastian and Stork, André and Fellner, Dieter W.},
title = {Schnelle Strömungsberechnungen mit GPU: Rapid CFD für die frühe konzeptionelle Designphase},
journal = {Digital Engineering Magazin},
year = {2012},
volume = {15},
number = {5},
pages = {44-47}
}
|
| Weber, D., Peña Serna, S., Stork, A. & Fellner, D.W., (2012), "Rapid CFD für die frühe konzeptionelle Design Phase", NAFEMS Online Magazin, Vol.21(1), pp.70-79. |
| Abstract: Ein wichtiger Teil des Produktentwicklungszyklus ist die Optimierung der strömungs- oder strukturmechanischen Eigenschaften einer Komponente, die normalerweise in einem iterativen und sehr aufwändigen Prozess stattfindet. Neben der Modifikation, Vereinfachung und des Vernetzens der Bauteilgeometrie, kann die Simulation mitunter Stunden bis Tage dauern. In frühen konzeptionellen Designphasen müssen verschiedene Materialparameter sowie unterschiedliche Geometrien ausprobiert und verglichen werden, um zu einem für das spätere Produkt optimalen Design zu gelangen. Dieser zeitaufwändige Prozess begrenzt deutlich die Anzahl der Möglichkeiten, die analysiert werden können. In dieser Arbeit wird das Framework 'Rapid CFD' vorgestellt, das es ermöglicht, schnelle Strömungssimulationen für die frühe konzeptionelle Designphase einzusetzen. Um eine solche Geschwindigkeit zu erreichen, wird die Berechnung und Visualisierung von zweidimensionalen Strömungen in Echtzeit kombiniert. Das ermöglicht die interaktive Modifikation von Parametern und Randbedingungen und damit eine schnelle Analyse und Bewertung von unterschiedlichen Geometrien und eine frühzeitige Optimierung eines Bauteils. Das Framework führt alle Berechnungen auf der Graphikkarte (graphics processing unit -- GPU) aus und vermeidet damit das aufwändige Kopieren zwischen CPU- und GPU-Hauptspeicher. Die Berechnungen werden auf einem Standard-Desktop PC ausgeführt, sodass die Simulationsergebnisse im Graphikkartenspeicher bleiben und direkt zur Visualisierung verwendet werden können. Für die Modellierung der Geometrie werden B-Splines verwendet, damit Benutzer lokal die Form durch einzelne Kontrollpunkte modifizieren können. Die Diskretisierung wird ebenfalls auf der GPU ausgeführt. Die Berechnung eines einzelnen Zeitschritts auch für Millionen von Unbekannten wird in Bruchteilen von Sekunden durchgeführt. Die intuitive geometrische Manipulation in Kombination mit der unmittelbaren Visualisierung der Simulationsgrößen wie Druck und Geschwindigkeit ermöglichen die direkte Analyse des Einflusses von Geometrie- und Parameteränderungen. Obwohl diese neuartige Simulationstechnik noch nicht die hohe Präzision konventioneller Simulationen erreicht, ermöglicht diese Technik die Beobachtung von Trends und Tendenzen. |
BibTeX:
@article{Weber*12nafems,
author = {Weber, Daniel and Peña Serna, Sebastian and Stork, André and Fellner, Dieter W.},
title = {Rapid CFD für die frühe konzeptionelle Design Phase},
journal = {NAFEMS Online Magazin},
year = {2012},
volume = {21},
number = {1},
pages = {70-79}
}
|
| Zmugg, R., Krispel, U., Thaller, W., Havemann, S., Pszeida, M. & Fellner, D.W., (2012), "A New Approach for Interactive Procedural Modelling in Cultural Heritage", Proceedings of the 40th Conference of Computer Applications and Quantitative Methods in Archaeology. |
BibTeX:
@inproceedings{zmugg*12CAA,
author = {René Zmugg and Ulrich Krispel and Wolfgang Thaller and Sven Havemann and Martin Pszeida and Dieter W. Fellner},
title = {A New Approach for Interactive Procedural Modelling in Cultural Heritage},
booktitle = {Proceedings of the 40th Conference of Computer Applications and Quantitative Methods in Archaeology},
year = {2012},
note = {to appear}
}
|
| Zmugg, R., Thaller, W., Hecher, M., Schiffer, T., Havemann, S. & Fellner, D.W., (2012), "Authoring Animated Interactive 3D Museum Exhibits using a Digital Repository", VAST 2012, pp.73-80, Eurographics Association, Goslar.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present the prototype of a software system to streamline the serial production of simple interactive 3D animations for the display in museum exhibitions. We propose dividing the authoring process in two phases, a designer phase and a curator phase. The designer creates a set of configurable 3D scene templates that fit with the look of the physical exhibition while the curator inserts 3D models and configures the scene templates; the finished scenes are uploaded to 3D kiosks in the museum. Distinguishing features of our system are the tight integration with an asset repository and the simplified scene graph authoring. We demonstrate the usefulness with a few examples. |
BibTeX:
@inproceedings{Zmugg*12VAST,
author = {Zmugg, René and Thaller, Wolfgang and Hecher, Martin and Schiffer, Thomas and Havemann, Sven and Fellner, Dieter W.},
title = {Authoring Animated Interactive 3D Museum Exhibits using a Digital Repository},
booktitle = {VAST 2012},
publisher = {Eurographics Association, Goslar},
year = {2012},
pages = {73-80},
doi = {http://dx.doi.org/10.2312/VAST/VAST12/073-080}
}
|
2011 |
| Augsdörfer, U.H., Dodgson, N.A. & Sabin, M.A., (2011), "Artifact analysis on B-splines, box-splines and other surfaces defined by quadrilateral polyhedra", Computer Aided Geometric Design, Vol.28(3), pp.177-197, Elsevier Science Publishers B. V..
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: When using NURBS or subdivision surfaces as a design tool in engineering applications, designers face certain challenges. One of these is the presence of artifacts. An artifact is a feature of the surface that cannot be avoided by movement of control points by the designer. This implies that the surface contains spatial frequencies greater than one cycle per two control points. These are seen as ripples in the surface and are found in NURBS and subdivision surfaces and potentially in all surfaces specified in terms of polyhedrons of control points. Ideally, this difference between designer intent and what emerges as a surface should be eliminated. The first step to achieving this is by understanding and quantifying the artifact observed in the surface. We present methods for analysing the magnitude of artifacts in a surface defined by a quadrilateral control mesh. We use the subdivision process as a tool for analysis. Our results provide a measure of surface artifacts with respect to initial control point sampling for all B-Splines, quadrilateral box-spline surfaces and regular regions of subdivision surfaces. We use four subdivision schemes as working examples: the three box-spline subdivision schemes, Catmull-Clark (cubic B-spline), 4-3, 4-8; and Kobbelt's interpolating scheme. |
BibTeX:
@article{Augsdoerfer*11cagd,
author = {Ursula H. Augsdörfer and Neil A. Dodgson and Malcolm A. Sabin},
title = {Artifact analysis on B-splines, box-splines and other surfaces defined by quadrilateral polyhedra},
journal = {Computer Aided Geometric Design},
publisher = {Elsevier Science Publishers B. V.},
year = {2011},
volume = {28},
number = {3},
pages = {177-197},
doi = {http://dx.doi.org/10.1016/j.cagd.2010.04.002}
}
|
| Augsdörfer, U.H., Dodgson, N.A. & Sabin, M.A., (2011), "Artifact analysis on triangular box-splines and subdivision surfaces defined by triangular polyhedra", Computer Aided Geometric Design, Vol.28(3), pp.198-211, Elsevier Science Publishers B. V..
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Surface artifacts are features in a surface which cannot be avoided by movement of control points. They are present in B-splines, box splines and subdivision surfaces. We showed how the subdivision process can be used as a tool to analyse artifacts in surfaces defined by quadrilateral polyhedra (Sabin et al., 2005; Augsdorfer et al., 2011). In this paper we are utilising the subdivision process to develop a generic expression which can be employed to determine the magnitude of artifacts in surfaces defined by any regular triangular polyhedra. We demonstrate the method by analysing box-splines and regular regions of subdivision surfaces based on triangular meshes: Loop subdivision, Butterfly subdivision and a novel interpolating scheme with two smoothing stages. We compare our results for surfaces defined by triangular polyhedra to those for surfaces defined by quadrilateral polyhedra. |
BibTeX:
@article{Augsdoerfer*11cagd2,
author = {Ursula H. Augsdörfer and Neil A. Dodgson and Malcolm A. Sabin},
title = {Artifact analysis on triangular box-splines and subdivision surfaces defined by triangular polyhedra},
journal = {Computer Aided Geometric Design},
publisher = {Elsevier Science Publishers B. V.},
year = {2011},
volume = {28},
number = {3},
pages = {198-211},
doi = {http://dx.doi.org/10.1016/j.cagd.2011.01.003}
}
|
| Barmak, K., Eggeling, E., Emelianenko, M., Epshteyn, Y., Kinderlehrer, D., Sharp, R. & Ta'asan, S., (2011), "An entropy based theory of the grain boundary character distribution", Discrete and continuous dynamical systems (Series A 30), pp.427-454.
[Abstract] [BibTeX] [PDF] |
| Abstract: Cellular networks are ubiquitous in nature. They exhibit behavior on many different length and time scales and are generally metastable. Most technologically useful materials are polycrystalline microstructures composed of a myriad of small monocrystalline grains separated by grain boundaries. The energetics and connectivity of the grain boundary network plays a crucial role in determining the properties of a material across a wide range of scales. A central problem in materials science is to develop technologies capable of producing an arrangement of grains -- a texture -- appropriate for a desired set of material properties. Here we discuss the role of energy in texture development, measured by a character distribution. We derive an entropy based theory based on mass transport and a Kantorovich-Rubinstein-Wasserstein metric to suggest that, to first approximation, this distribution behaves like the solution to a Fokker-Planck Equation. |
BibTeX:
@article{Barmak*11dcds-a,
author = {K. Barmak and E. Eggeling and M. Emelianenko and Y. Epshteyn and D. Kinderlehrer and R. Sharp and S. Ta'asan},
title = {An entropy based theory of the grain boundary character distribution},
journal = {Discrete and continuous dynamical systems (Series A 30)},
year = {2011},
pages = {427-454}
}
|
| Barmak, K., Eggeling, E., Emelianenko, M., Epshteyn, Y., Kinderlehrer, D., Sharp, R. & Ta'asan, S., (2011), "Critical events, entropy, and the grain boundary character distribution", Phys. Rev. B, Vol.83, pp.134117, American Physical Society.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Mesoscale experiment and simulation permit harvesting information about both geometric features and texture in polycrystals. The grain boundary character distribution (GBCD) is an empirical distribution of the relative length [in two dimensions (2D)] or area (in 3D) of an interface with a given lattice misorientation and normal. During the growth process, an initially random distribution of boundary types reaches a steady state that is strongly correlated to the interfacial energy density. In simulation, it is found that if the given energy density depends only on lattice misorientation, then the steady-state GBCD and the energy are related by a Boltzmann distribution. This is among the simplest nonrandom distributions, corresponding to independent trials with respect to the energy. In this paper, we derive an entropy-based theory that suggests that the evolution of the GBCD satisfies a Fokker-Planck equation, an equation whose stationary state is a Boltzmann distribution. Cellular structures coarsen according to a local evolution law, curvature-driven growth, and are limited by space-filling constraints. The interaction between the evolution law and the constraints is governed primarily by the force balance at triple junctions, the natural boundary condition associated with curvature-driven growth, and determines a dissipation relation. A simplified coarsening model is introduced that is driven by the boundary conditions and reflects the network level dissipation relation of the grain growth system. It resembles an ensemble of inertia-free spring-mass dashpots. Application is made of the recent characterization of Fokker-Planck kinetics as a gradient flow for a free energy in deriving the theory. The theory predicts the results of large-scale two-dimensional simulations and is consistent with experiment. |
BibTeX:
@article{Barmak*11physRevB,
author = {Barmak, K. and Eggeling, E. and Emelianenko, M. and Epshteyn, Y. and Kinderlehrer, D. and Sharp, R. and Ta'asan, S.},
title = {Critical events, entropy, and the grain boundary character distribution},
journal = {Phys. Rev. B},
publisher = {American Physical Society},
year = {2011},
volume = {83},
pages = {134117},
doi = {http://dx.doi.org/10.1103/PhysRevB.83.134117}
}
|
| Bein, M., Fellner, D.W. & Stork, A., (2011), "Genetic B-Spline Approximation on Combined B-Reps", The Visual Computer, Vol.27(6-8), pp.485-494.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present a genetic algorithm for approximating densely sampled curves with uniform cubic B-Splines suitable for Combined B-reps. A feature of this representation is altering the continuity property of the B-Spline at any knot, allowing combining freeform curves and polygonal parts within one representation. Naturally there is a trade-off between different approximation properties like accuracy and the number of control points needed. Our algorithm creates very accurate B-Splines with few control points, as shown in Fig. 1. Since the approximation problem is highly nonlinear, we approach it with genetic methods, leading to better results compared to classical gradient based methods. Parallelization and adapted evolution strategies are used to create results very fast. |
BibTeX:
@article{Bein*11cgi,
author = {Bein, Matthias and Fellner, Dieter W. and Stork, André},
title = {Genetic B-Spline Approximation on Combined B-Reps},
journal = {The Visual Computer},
year = {2011},
volume = {27},
number = {6-8},
pages = {485-494},
doi = {http://dx.doi.org/10.1007/s00371-011-0592-9}
}
|
| Berndt, R., Griesbaum, J., Mandl, T. & Womser-Hacker, C. (ed.) (2011), "3D-Modelle in bibliothekarischen Angeboten", Information und Wissen: global, sozial und frei?, Vol.58, pp.498-499. |
BibTeX:
@inproceedings{Berndt11isi,
author = {René Berndt},
editor = {J. Griesbaum and T. Mandl and C. Womser-Hacker},
title = {3D-Modelle in bibliothekarischen Angeboten},
booktitle = {Information und Wissen: global, sozial und frei?},
year = {2011},
volume = {58},
pages = {498-499}
}
|
| Bhatti, N. & Fellner, D.W., Dogru, A.H. & Bicer, V. (ed.) (2011), "Visual Semantic Analysis to Support Semi-Automatic Modeling of Semantic Service Descriptions", Modern Software Engineering Concepts and Practices: Advanced Approaches, pp.151-195, IGI Global.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: The service-oriented architecture has become one of the most popular approaches for distributed business applications. A new trend service ecosystem is merging, where service providers can augment their core services by using business service delivery-related available functionalities like distribution and delivery. The semantic service description of services for the business service delivery will become a bottleneck in the service ecosystem. In this chapter, the Visual Semantic Analysis approach is presented to support semi-automatic modeling of semantic service description by combining machine learning and interactive visualization techniques. Furthermore, two application scenarios from the project THESEUS-TEXO (funded by German federal ministry of economics and technology) are presented as evaluation of the Visual Semantic Analysis approach. |
BibTeX:
@incollection{Bhatti-Fellner11,
author = {Nadeem Bhatti and Dieter W. Fellner},
editor = {Ali H. Dogru and Veli Bicer},
title = {Visual Semantic Analysis to Support Semi-Automatic Modeling of Semantic Service Descriptions},
booktitle = {Modern Software Engineering Concepts and Practices: Advanced Approaches},
publisher = {IGI Global},
year = {2011},
pages = {151-195},
doi = {http://dx.doi.org/10.4018/978-1-60960-215-4.ch007}
}
|
| Bieber, G., Haescher, M., Peter, C., Aehnelt, M., Richter, C. & Gohlke, H., (2011), "Handsfree Interaction mittels Handgelenkssensoren für mobile Assistenzsysteme", 6. Kongress Multimediatechnik Wismar 2011, pp.34-40, Hochschule Wismar.
[BibTeX] [PDF] |
BibTeX:
@inproceedings{Bieber*11aal,
author = {Gerald Bieber and Marian Haescher and Christian Peter and Mario Aehnelt and Claas Richter and Holger Gohlke},
title = {Handsfree Interaction mittels Handgelenkssensoren für mobile Assistenzsysteme},
booktitle = {6. Kongress Multimediatechnik Wismar 2011},
publisher = {Hochschule Wismar},
year = {2011},
pages = {34-40},
note = {extended abstract}
}
|
| Bieber, G., Luthardt, A., Peter, C. & Urban, B., (2011), "The hearing trousers pocket -- activity recognition by alternative sensors", Association for Computing Machinery (ACM): The 4th ACM International Conference on PErvasive Technologies Related to Assistive Environments : PETRA 2011, pp.123-128, ACM.
[Abstract] [BibTeX] [PDF] |
| Abstract: In daily life, mobile phones accompany the user permanently and are worn often in the front pocket of the trousers. The sensors included in today's mobile phones can hence be used for ubiquitous assistance. For instance, the acceleration sensor could be used for analysis of the person's bodily activity, or the microphone can be used to analyze the environmental noise levels. A possible sensor fusion provides additional and assured environmental and context information. This work presents new methods of activity recognition by acceleration and sound sensors by means of sensors included in commercially available smart phones during everyday life. We could identify that sounds provide valuable additional information on a user's situation that allow to better asses a person's current context. |
BibTeX:
@inproceedings{Bieber*11petra,
author = {Bieber, G. and Luthardt, A. and Peter, C. and Urban, B.},
title = {The hearing trousers pocket -- activity recognition by alternative sensors},
booktitle = {Association for Computing Machinery (ACM): The 4th ACM International Conference on PErvasive Technologies Related to Assistive Environments : PETRA 2011},
publisher = {ACM},
year = {2011},
pages = {123-128}
}
|
| Binotto, A., Pereira, C.E., Kuijper, A., Stork, A. & Fellner, D.W., (2011), "An Effective Dynamic Scheduling Runtime and Tuning System for Heterogeneous Multi and Many-Core Desktop Platforms", Proceedings 2011 IEEE International Conference on High Performance Computing and Communications, pp.78-85, IEEE Computer Society Conference Publishing Services (CPS), Los Alamitos, Calif..
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: A personal computer can be considered as a one-node heterogeneous cluster that simultaneously processes several application tasks. It can be composed by, for example, asymmetric CPU and GPUs. This way, a high-performance heterogeneous platform is built on a desktop for data intensive engineering calculations. In our perspective, a workload distribution over the Processing Units (PUs) plays a key role in such systems. This issue presents challenges since the cost of a task at a PU is non-deterministic and can be affected by parameters not known a priori. This paper presents a context-aware runtime and tuning system based on a compromise between reducing the execution time of engineering applications - due to appropriate dynamic scheduling - and the cost of computing such scheduling applied on a platform composed of CPU and GPUs. Results obtained in experimental case studies are encouraging and a performance gain of 21.77 percent was achieved in comparison to the static assignment of all tasks to the GPU. |
BibTeX:
@inproceedings{Binotto*11hpcc,
author = {Binotto, Alecio and Pereira, Carlos Eduardo and Kuijper, Arjan and Stork, André and Fellner, Dieter W.},
title = {An Effective Dynamic Scheduling Runtime and Tuning System for Heterogeneous Multi and Many-Core Desktop Platforms},
booktitle = {Proceedings 2011 IEEE International Conference on High Performance Computing and Communications},
publisher = {IEEE Computer Society Conference Publishing Services (CPS), Los Alamitos, Calif.},
year = {2011},
pages = {78-85},
doi = {http://dx.doi.org/10.1109/HPCC.2011.20}
}
|
| Breuel, F., Berndt, R., Ullrich, T., Eggeling, E. & Fellner, D.W., Tonta, Y., Al, U., Erdogan, P.L. & Baptista, A.A. (ed.) (2011), "Mate in 3D -- Publishing Interactive Content in PDF3D", Publishing in the Networked World: Transforming the Nature of Communication, pp.110-119, Hacettepe University Department of Information Management. |
BibTeX:
@inproceedings{Breuel*11elpub,
author = {Frank Breuel and René Berndt and Torsten Ullrich and Eva Eggeling and D.~W. Fellner},
editor = {Yasar Tonta and Umut Al and Phyllis Lepon Erdogan and Ana Alice Baptista},
title = {Mate in 3D -- Publishing Interactive Content in PDF3D},
booktitle = {Publishing in the Networked World: Transforming the Nature of Communication},
publisher = {Hacettepe University Department of Information Management},
year = {2011},
pages = {110-119}
}
|
| Burkhardt, D., Nazemi, K., Stab, C., Breyer, M., Wichert, R. & Fellner, D.W., (2011), "Natürliche Gesteninteraktion mit Beschleunigungssensorbasierten Eingabegeräten in unterstützenden Umgebungen", Ambient Assisted Living, pp.10, VDE-Verl., Berlin u.a.. |
| Abstract: Die Verwendung von modernen Interaktionsmethoden und Geräten erlaubte eine natürlichere und intuitive Interaktion. Gegenwärtig haben lediglich die Smartphones und Spielekonsolen großen Absatz, welche eine gestenbasierte Interaktion unterstützen. Dies geht einher, dass solche Geräte nicht nur von technisch versierten Konsumenten gekauft werden. Die Interaktion mit solchen Geräten gestaltet sich so einfach, dass oftmals auch ältere Personen mit diesen spielen oder arbeiten. Insbesondere ältere Personen sind häufig gehandicapt, so haben sie oftmals Probleme kleinere Text zu lesen, wie sie häufig auf Fernbedienungen gedruckt sind. Ebenso neigen sie dazu, schnell überfordert zu sein, so dass gerade größere technische Systeme keine Hilfe sind. Wenn die Geräte mit Gesten steuerbar sind, sind die genannten Probleme oftmals vermeidbar. Um aber eine intuitive und einfache Gesteninteraktion zu ermöglichen, müssen entsprechend verständliche und nachvollziehbare Gesten unterstützt werden. Aus diesem Grund versuchen wir in diesem Paper intuitive Gesten für gängige Interaktionsszenarien an computerbasierten Systemen für den Einsatz in unterstützenden Umgebungen zu identifizieren. Im Rahmen der Evaluation sollen die Probanden hierfür ihre bevorzugten Gesten für die verschiedenen Interaktionsszenarien einbringen. Auf Grundlage der Ergebnisse kann später ein intuitiv bedienbares System, unter Verwendung eines beschleunigungssensorbasierten Geräts, entwickelt werden, mit welchem die Nutzer auf intuitive Weise kommunizieren können. Using modern interaction methods and devices provides a more natural and intuitive interaction. Currently, only mobile phones and game consoles which are supporting such gesture-based interactions have good payment-rates. This comes along, that such devices will bought not only by the traditional technical experienced consumers. The interaction with such devices becomes so easy, that also older people playing or working with them. Especially older people have more handicaps, so for them it is hard to read small text, like they are used as description to buttons on remote controls for televisions. They also become fast overstrained, so that bigger technical systems are no help for them. If it is possible to interact with gestures, all these problems can be avoided. But to allow an intuitive and easy gesture interaction, gestures have to be supported, which are easy to understand. Because of that fact, in this paper we tried to identify intuitive gestures for common interaction scenarios on computer-based systems for uses in ambient assisted environment. In this evaluation, the users should commit their opinion of intuitive gestures for different presented scenarios/tasks. Basing on these results, intuitively useable systems can be developed, so that users are able to communicate with technical systems on more intuitive level with accelerometer-based devices. |
BibTeX:
@inproceedings{Burkhardt*11aal,
author = {Burkhardt, Dirk and Nazemi, Kawa and Stab, Christian and Breyer, Matthias and Wichert, Reiner and Fellner, Dieter W.},
title = {Natürliche Gesteninteraktion mit Beschleunigungssensorbasierten Eingabegeräten in unterstützenden Umgebungen},
booktitle = {Ambient Assisted Living},
publisher = {VDE-Verl., Berlin u.a.},
year = {2011},
pages = {10}
}
|
| Fellner, D.W., Baier, K., Klingelmeyer, M., Bornemann, H. & Mentel, K. (ed.) (2011), "Jahresbericht 2010: Fraunhofer-Institut für Graphische Datenverarbeitung IGD", Fraunhofer-Institut für Graphische Datenverarbeitung (IGD). |
BibTeX:
@book{Fellner*11ar-igd,,
editor = {Fellner, Dieter W. and Baier, Konrad and Klingelmeyer, Melanie and Bornemann, Heidrun and Mentel, Katrin},
title = {Jahresbericht 2010: Fraunhofer-Institut für Graphische Datenverarbeitung IGD},
publisher = {Fraunhofer-Institut für Graphische Datenverarbeitung (IGD)},
year = {2011},
note = {58 S.}
}
|
| Fellner, D.W., Havemann, S., Beckmann, P. & Pan, X., (2011), "Practical 3D reconstruction of cultural heritage artefacts from photographs -- potentials and issues", VAR. Virtual Archaeology Review [online], Vol.2(4), pp.95-103.
[Abstract] [BibTeX] [PDF] |
| Abstract: A new technology is on the rise that allows the 3D-reconstruction of Cultural Heritage objects from image sequences taken by ordinary digital cameras. We describe the first experiments we made as early adopters in a community-funded research project whose goal is to develop it into a standard CH technology. The paper describes in detail a step-by-step procedure that can be reproduced using free tools by any CH professional. We also give a critical assessment of the workflow and describe several ideas for developing it further into an automatic procedure for 3D reconstruction from images. |
BibTeX:
@article{Fellner*11var,
author = {Fellner, Dieter W. and Havemann, Sven and Beckmann, Philipp and Pan, Xueming},
title = {Practical 3D reconstruction of cultural heritage artefacts from photographs -- potentials and issues},
journal = {VAR. Virtual Archaeology Review [online]},
year = {2011},
volume = {2},
number = {4},
pages = {95-103}
}
|
| Fellner, D.W. & Schaub, J. (ed.) (2011), "Selected Readings in Computer Graphics 2010", Fraunhofer IGD, Darmstadt. |
| Abstract: The Fraunhofer Institute for Computer Graphics Research IGD with offices in Darmstadt as well as in Rostock, Singapore, and Graz, the partner institutes at the respective universities, the Interactive Graphics Systems Group of Technische Universität Darmstadt, the Computergraphics and Communication Group of the Institute of Computer Science at Rostock University, Nanyang Technological University (NTU), Singapore, and the Visual Computing Cluster of Excellence of Graz University of Technology, cooperate closely within projects and research and development in the field of Computer Graphics. The "Selected Readings in Computer Graphics 2010" consist of 45 articles selected from a total of 186 scientific publications contributed by all these institutions. All articles previously appeared in various scientific books, journals, conferences and workshops, and are reprinted with permission of the respective copyright holders. The publications had to undergo a thorough review process by internationally leading experts and established technical societies. Therefore, the Selected Readings should give a fairly good and detailed overview of the scientific developments in Computer Graphics in the year 2010. They are published by Professor Dieter W. Fellner, the director of Fraunhofer Institute for Computer Graphics Research IGD in Darmstadt, at the same time professor at the Department of Computer Science at Technische Universität Darmstadt, and professor at the Faculty of Computer Science at Graz University of Technology. |
BibTeX:
@book{Fellner-Schaub11sr,,
editor = {Fellner, Dieter W. and Schaub, Jutta},
title = {Selected Readings in Computer Graphics 2010},
publisher = {Fraunhofer IGD, Darmstadt},
year = {2011}
}
|
| Havemann, S., Beckmann, P., Pan, X. & Fellner, D.W., (2011), "Practical 3D Reconstruction of Cultural Heritage Artefacts from Photographs -- Potentials and Issues", VAR. Virtual Archaeology Review [online], Vol.2(4), pp.95-103.
[BibTeX] [PDF] |
BibTeX:
@article{Havemann*10arq,
author = {Sven Havemann and Philipp Beckmann and Xueming Pan and Dieter W. Fellner},
title = {Practical 3D Reconstruction of Cultural Heritage Artefacts from Photographs -- Potentials and Issues},
journal = {VAR. Virtual Archaeology Review [online]},
year = {2011},
volume = {2},
number = {4},
pages = {95-103},
note = {Proc. ARQUEOLOGICA 2.0, Alfredo Grande and Victor Lopez-Menchero, eds. }
}
|
| Havemann, S. & Fellner, D.W., Calude, C.S., Rozenberg, G. & Salomaa, A. (ed.) (2011), "Towards a New Shape Description Paradigm Using the Generative Modeling Language", Rainbow of Computer Science, Vol.6570, pp.200-214, Springer, Berlin, Heidelberg, New York.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: A procedural description of a three-dimensional shape has undeniable advantages over conventional descriptions that are all based on the exhaustive enumeration paradigm. Although it is a true generalization, a procedural description of a given shape class is not always easy to obtain. The main problem is that procedural descriptions are typically Turing-complete, which makes 3D shape design formally (and practically) a programming task. We describe an approach that circumvents this problem, is efficient, extensible, and conceptually simple. We demonstrate the broad applicability with a number of examples from different domains and sketch possible future applications. But we also discuss some practical and theoretical limitations of the generative paradigm. |
BibTeX:
@incollection{Havemann-Fellner11,
author = {Havemann, Sven and Fellner, Dieter W.},
editor = {Cristian S. Calude and Grzegorz Rozenberg and Arto Salomaa},
title = {Towards a New Shape Description Paradigm Using the Generative Modeling Language},
booktitle = {Rainbow of Computer Science},
publisher = {Springer, Berlin, Heidelberg, New York},
year = {2011},
volume = {6570},
pages = {200-214},
doi = {http://dx.doi.org/10.1007/978-3-642-19391-0_15}
}
|
| Hecher, M., Möstl, R., Eggeling, E., Derler, C. & Fellner, D.W., (2011), "'Tangible Culture' -- Designing Virtual Exhibitions on Multi-Touch Devices", Ercim News, Vol.86, pp.21-22, ERCIM EEIG.
[Abstract] [BibTeX] [PDF] |
| Abstract: Extracting and archiving information from digital images of documents is one of the goals of the project AMMIRA (multispectral acquisition, enhancing, indexing and retrieval of artifacts), led by Tea- Sas, a service firm based in Catanzaro, Italy, with the collaboration of two Italian research teams, the Institute of Information Science and Technologies of CNR in Pisa, and the Department of Mechanical Engineering of the University of Calabria in Cosenza. AMMIRA is supported by European funding, through the Italian regional program for integrated support to enterprises. |
BibTeX:
@inproceedings{Hecher*11ercim,
author = {Hecher, Martin and Möstl, Robert and Eggeling, Eva and Derler, Christian and Fellner, Dieter W.},
title = {'Tangible Culture' -- Designing Virtual Exhibitions on Multi-Touch Devices},
booktitle = {Ercim News},
publisher = {ERCIM EEIG},
year = {2011},
volume = {86},
pages = {21-22},
note = {short article overview of Hecher*12elpub}
}
|
| Huff, R., Gierlinger, T., Kuijper, A., Stork, A. & Fellner, D.W., (2011), "A Comparison of xPU Platforms Exemplified with Ray Tracing Algorithms", XIII Symposium on Virtual Reality, pp.1-8, IEEE Computer Society Conference Publishing Services (CPS), Los Alamitos, Calif..
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Over the years, faster hardware -- with higher clock rates -- has been the usual way to improve computing times in computer graphics. Aside from highly costly parallel solutions only affordable by big industries -- like the movie industry --, there was no alternative available to desktop users. Nevertheless, this scenario is dramatically changing with the introduction of more and more parallelism in current desktop PCs. Multi-core CPUs are a common basis in current PCs and the power of modern GPUs -- which have been multi-core for a long time now -- is getting unveiled to developers. nVidia's CUDA is a powerful weapon to explore GPUs parallelism. Yet, its specific target -- nVidia graphic cards only -- does not provide any solution to other parallel hardware present. OpenCL is a new royalty-free cross-platform intended to be portable across different hardware manufacturers or even different platforms. In this paper we focus on a comparison of advantages and disadvantages of xPU platforms with OpenCL and CUDA in terms of time efficiency. As an example application we use ray tracing algorithms. Three kinds of ray tracers have to be developed in order to conduct a fair comparison: one is CPU based, while the other two are GPU based -- using CUDA and OpenCL, respectively. At the end, a comparison is done between them and results are presented and analyzed showing that the CUDA implementation has the best frame rate, but is very closely followed by the OpenCL implementation. Visually, results are identical, showing the high potential of OpenCL as an alternative for CUDA with identical performance. |
BibTeX:
@inproceedings{Huff*11vr,
author = {Huff, Rafael and Gierlinger, Thomas and Kuijper, Arjan and Stork, André and Fellner, Dieter W.},
title = {A Comparison of xPU Platforms Exemplified with Ray Tracing Algorithms},
booktitle = {XIII Symposium on Virtual Reality},
publisher = {IEEE Computer Society Conference Publishing Services (CPS), Los Alamitos, Calif.},
year = {2011},
pages = {1-8},
doi = {http://dx.doi.org/10.1109/SVR.2011.18}
}
|
| Jung, Y., Kuijper, A., Fellner, D.W., Kipp, M., Miksatko, J., Gratch, J. & Thalmann, D., John, N. & Wyvill, B. (ed.) (2011), "Believable Virtual Characters in Human-Computer Dialogs", Eurographics 2011. State of the Art Reports (STARs), pp.75-100, Eurographics Association.
[Abstract] [BibTeX] [PDF] |
| Abstract: For many application areas, where a task is most naturally represented by talking or where standard input devices are difficult to use or not available at all, virtual characters can be well suited as an intuitive man-machineinterface due to their inherent ability to simulate verbal as well as nonverbal communicative behavior. This type of interface is made possible with the help of multimodal dialog systems, which extend common speech dialog systems with additional modalities just like in human-human interaction. Multimodal dialog systems consist at least of an auditive and graphical component, and communication is based on speech and nonverbal communication alike. However, employing virtual characters as personal and believable dialog partners in multimodal dialogs entails several challenges, because this requires not only a reliable and consistent motion and dialog behavior but also regarding nonverbal communication and affective components. Besides modeling the 'mind' andcreating intelligent communication behavior on the encoding side, which is an active field of research in artificial intelligence, the visual representation of a character including its perceivable behavior, from a decoding perspective, such as facial expressions and gestures, belongs to the domain of computer graphics and likewise implicates many open issues concerning natural communication. Therefore, in this report we give a comprehensive overview how to go from communication models to actual animation and rendering. |
BibTeX:
@inproceedings{Jung*11eg,
author = {Yvonne Jung and Arjan Kuijper and Dieter W. Fellner and Michael Kipp and Jan Miksatko and Jonathan Gratch and Daniel Thalmann},
editor = {N. John and B. Wyvill},
title = {Believable Virtual Characters in Human-Computer Dialogs},
booktitle = {Eurographics 2011. State of the Art Reports (STARs)},
publisher = {Eurographics Association},
year = {2011},
pages = {75-100}
}
|
| Lancelle, M. & Fellner, D.W., (2011), "Smooth Transitions for Large Scale Changes in Multi-Resolution Images", 16th International Workshop on Vision, Modeling, and Visualization (VMV), pp.81-87.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Today's super zoom cameras offer a large optical zoom range of over 30x. It is easy to take a wide angle photograph of the scene together with a few zoomed in high resolution crops. Only little work has been done to appropriately display the high resolution photo as an inset. Usually, to hide the resolution transition, alpha blending is used. Visible transition boundaries or ghosting artifacts may result. In this paper we introduce a different, novel approach to overcome these problems. Across the transition, we gradually attenuate the maximum image frequency. We achieve this with a Gaussian blur with an exponentially increasing standard deviation. |
BibTeX:
@inproceedings{Lancelle-Fellner11VMV,
author = {Marcel Lancelle and Dieter W. Fellner},
title = {Smooth Transitions for Large Scale Changes in Multi-Resolution Images},
booktitle = {16th International Workshop on Vision, Modeling, and Visualization (VMV)},
year = {2011},
pages = {81-87},
doi = {http://dx.doi.org/10.2312/PE/VMV/VMV11/081-087}
}
|
| Lancelle, M. & Fellner, D.W., (2011), "Soft Edge and Soft Corner Blending", Workshop Virtuelle & Erweiterte Realität (VR/AR), pp.63-71.
[Abstract] [BibTeX] [PDF] |
| Abstract: We address artifacts at corners in soft edge blend masks for tiled projector arrays. We compare existing and novel modifications of the commonly used weighting function and analyze the first order discontinuities of the resulting blend masks. In practice, e.g. when the projector lamps are not equally bright or with rear projection screens, these discontinuities may lead to visible artifacts. By using first order continuous weighting functions, we achieve significantly smoother results compared to commonly used blend masks. |
BibTeX:
@inproceedings{Lancelle-Fellner11vrar,
author = {Lancelle, Marcel and Fellner, Dieter W.},
title = {Soft Edge and Soft Corner Blending},
booktitle = {Workshop Virtuelle & Erweiterte Realität (VR/AR)},
year = {2011},
pages = {63-71}
}
|
| Lancelle, M., (2011), "Visual Computing in Virtual Environments".
[Abstract] [BibTeX] [PDF] |
| Abstract: This thesis covers research on new and alternative ways of interaction with computers. Virtual Reality and multi touch setups are discussed with a focus on three dimensional rendering and photographic applications in the field of Computer Graphics. Virtual Reality (VR) and Virtual Environments (VE) were once thought to be the future interface to computers. However, a lot of problems prevent an everyday use. This work shows solutions to some of the problems and discusses remaining issues. Hardware for Virtual Reality is diverse and many new devices are still being developed. An overview on historic and current devices and VE setups is given and our setups are described. The DAVE, an immersive projection room, and the HEyeWall Graz, a large high resolution display with multi touch input are presented. Available processing power and in some parts rapidly decreasing prices lead to a continuous change of the best choice of hardware. A major influence of this choice is the application. VR and multi touch setups often require sensing or tracking the user, optical tracking being a common choice. Hardware and software of an optical 3D marker tracking and an optical multi touch system are explained. The Davelib, a software framework for rendering 3D models in Virtual Environments is presented. It allows to easily port existing 3D applications to immersive setups with stereoscopic rendering and head tracking. Display calibration and rendering issues that are special to VR setups are explained. User interfaces for navigation and manipulation are described, focusing on interaction techniques for the DAVE and for multi touch screens. Intuitive methods are shown that are easy to learn and use, even for computer illiterates. Exemplary applications demonstrate the potential of immersive and non-immersive setups, showing which applications can most benefit from Virtual Environments. Also, some image processing applications in the area of computational photography are explained, that help to better depict the captured scene. |
BibTeX:
@phdthesis{Lancelle11:Phd,
author = {Lancelle, Marcel},
title = {Visual Computing in Virtual Environments},
school = {TU Graz, Diss., 2011},
year = {2011},
note = {228 p.}
}
|
| Landesberger, T. v., Kuijper, A., Schreck, T., Kohlhammer, Jö., van Wijk, J., Fekete, J.-D. & Fellner, D.W., (2011), "Visual Analysis of Large Graphs: State-of-the-Art and Future Research Challenges", Computer Graphics Forum, Vol.30(6), pp.1719-1749.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: The analysis of large graphs plays a prominent role in various fields of research and is relevant in many important application areas. Effective visual analysis of graphs requires appropriate visual presentations in combination with respective user interaction facilities and algorithmic graph analysis methods. How to design appropriate graph analysis systems depends on many factors, including the type of graph describing the data, the analytical task at hand and the applicability of graph analysis methods. The most recent surveys of graph visualization and navigation techniques cover techniques that had been introduced until 2000 or concentrate only on graph layouts published until 2002. Recently, new techniques have been developed covering a broader range of graph types, such as timevarying graphs. Also, in accordance with ever growing amounts of graph-structured data becoming available, the inclusion of algorithmic graph analysis and interaction techniques becomes increasingly important. In this State-of-the-Art Report, we survey available techniques for the visual analysis of large graphs. Our review first considers graph visualization techniques according to the type of graphs supported. The visualization techniques form the basis for the presentation of interaction approaches suitable for visual graph exploration. As an important component of visual graph analysis, we discuss various graph algorithmic aspects useful for the different stages of the visual graph analysis process. We also present main open research challenges in this field. |
BibTeX:
@article{Landesberger*11cgf,
author = {Landesberger, Tatiana von and Kuijper, Arjan and Schreck, Tobias and Kohlhammer, Jörn and van Wijk, Jarke and Fekete, Jean-Daniel and Fellner, Dieter W.},
title = {Visual Analysis of Large Graphs: State-of-the-Art and Future Research Challenges},
journal = {Computer Graphics Forum},
year = {2011},
volume = {30},
number = {6},
pages = {1719-1749},
doi = {http://dx.doi.org/10.1111/j.1467-8659.2011.01898.x}
}
|
| Nazemi, K., Burkhardt, D., Stab, C., Breyer, M., Wichert, R. & Fellner, D.W., (2011), "Natural Gesture Interaction with Accelerometer-based Devices in Ambient Assisted Environments", Ambient Assisted Living, pp.75-90, Springer Science and Business Media, Berlin.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Using modern interaction methods and devices provides a more natural and intuitive interaction. Currently, only mobile phones and game consoles which are supporting such gesture-based interactions have good payment-rates. This comes along, that such devices will bought not only by the traditional technical experienced consumers. The interaction with such devices becomes so easy, that also older people playing or working with them. Especially older people have more handicaps, so for them it is hard to read small text, like they are used as description to buttons on remote controls for televisions. They also become fast overstrained, so that bigger technical systems are no help for them. If it is possible to interact with gestures, all these problems can be avoided. But to allow an intuitive and easy gesture interaction, gestures have to be supported, which are easy to understand. Because of that fact, in this paper we tried to identify intuitive gestures for common interaction scenarios on computer-based systems for uses in ambient assisted environment. In this evaluation, the users should commit their opinion of intuitive gestures for different presented scenarios/tasks. Basing on these results, intuitively useable systems can be developed, so that users are able to communicate with technical systems on more intuitive level with accelerometer-based devices. |
BibTeX:
@inproceedings{Nazemi*10aal,
author = {Nazemi, Kawa and Burkhardt, Dirk and Stab, Christian and Breyer, Matthias and Wichert, Reiner and Fellner, Dieter W.},
title = {Natural Gesture Interaction with Accelerometer-based Devices in Ambient Assisted Environments},
booktitle = {Ambient Assisted Living},
publisher = {Springer Science and Business Media, Berlin},
year = {2011},
pages = {75-90},
doi = {http://dx.doi.org/10.1007/978-3-642-18167-2_6}
}
|
| Peña Serna, S., Stork, A. & Fellner, D.W., (2011), "Interactive Exploration of Design Variations", A World of Engineering Simulation: Industrial Needs, Best Practice, Visions for the Future, pp.18, NAFEMS, Glasgow.
[Abstract] [BibTeX] [PDF] |
| Abstract: The digital exploration of design variations is a key procedure in the embodiment phase of engineering design, in order to efficiently develop optimal solutions. This procedure requires the combination of modeling and simulation capabilities, enabling the engineer to assess the physical and functional behaviors of the proposed solution. Nowadays, this procedure is performed by means of iterating between designers and analysts with their corresponding tools and demanding reciprocal understanding between them. This is nonetheless a very time consuming activity with the currently available tools and technology, even the advance Computer Aided Design (CAD) systems, which can cope with almost any modeling requirement and which presently provide direct connection (i.e. meshing) to analysis modules for models with limited complexity, cannot deal with the interactive exploration of design variations. Moreover, the promising isogeometric analysis, which aims to simulate 3D NURBS representations also requires special transformations (i.e. meshing), which do not allow for interactive exploration of design variations. On the other side, the Computer Aided Engineering (CAE) systems offering morphing support, are only able to explore restricted variations, since large variations or deformations of the model involves expensive remeshing processes. In order to overcome the above mentioned issues and to enable a fully interactive exploration of design variations within an analysis environment, we enhance the simulating model with a high level representation for interacting with semantic features rather than with single elements, we perform combined morphing techniques with local mesh modification for preserving the stability of the numerical model during large variations, and we decouple the storage of the linear system entries and the sequential matrixvector multiplication for getting the solution, in order to permit the update of local entries of the matrix representing the local mesh modifications without the need of a rebuild of the entire system. Our methodology allows the engineers to independently and interactively explore conceptual design variations without restrictions. Hence, the investigation and understanding of the influence of different design features can easily and fast be evaluated and the development of optimal solutions for the design requirements can closely be fulfilled. |
BibTeX:
@inproceedings{Pena*11nwc,
author = {Peña Serna, Sebastian and Stork, André and Fellner, Dieter W.},
title = {Interactive Exploration of Design Variations},
booktitle = {A World of Engineering Simulation: Industrial Needs, Best Practice, Visions for the Future},
publisher = {NAFEMS, Glasgow},
year = {2011},
pages = {18}
}
|
| Peña Serna, S., Stork, A. & Fellner, D.W., (2011), "Considerations toward a Dynamic Mesh Data Structure", SIGRAD 2011, pp.83-90, Linköping University Electronic Press, Linköping. |
| Abstract: The use of 3D shapes in different domains such as in engineering, entertainment, cultural heritage or medicine, is essential for representing 3D physical reality. Regardless of whether the 3D shapes are representing physically or digitally born objects, meshes are a versatile and common representation for the 3D reality. Nonetheless, the mesh generation process does not always produce qualitative results, thus incomplete, non-orientable or non-manifold meshes frequently are the input for the domain application. The domain application itself also demands special requirements, e.g. an engineering simulation requires a volumetric mesh either tetrahedral or hexahedral, while a cultural heritage color enhancement uses a triangular or quadrangular mesh, or in both cases even hybrid meshes. Moreover, the processes applied on the meshes (e.g. modeling, simulation, visualization) need to support some operations, such as querying neighboring information or enabling dynamic changes of geometry and topology. These operations need to be robust, hence the neighboring information can be consistently updated, during the dynamic changes. Dealing with this mesh diversity usually requires dedicated data structures for performing in the given domain application. This paper compiles the considerations toward designing a data structure for dynamic meshes in a generic and robust manner, despite the type and the quality of the input mesh. These aspects enable a flexible representation of 3D shapes toward general purpose geometry processing for dynamic meshes in 2D and 3D. |
BibTeX:
@inproceedings{Pena*11sigrad,
author = {Peña Serna, Sebastian and Stork, André and Fellner, Dieter. W.},
title = {Considerations toward a Dynamic Mesh Data Structure},
booktitle = {SIGRAD 2011},
publisher = {Linköping University Electronic Press, Linköping},
year = {2011},
pages = {83-90}
}
|
| Pfister, H.-R., Wollstädter, S. & Peter, C., (2011), "Affective Responses to System Messages in Human-Computer-Interaction: Effects of Modality and Message Type", Interacting with Computers, Vol.23, pp.372-383.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Affective responses of users to system messages in human-computer interaction are a key to study user satisfaction. However, little is known about the particular affective patterns elicited by various types of system messages. In this experimental study we examined if and how different system messages, presented in different modalities, influence users' affective responses. Three types of messages, input requests, status notifications, and error messages, were presented either as text or speech, and either alone or in combination with icons or sounds, while users worked on several typical computer tasks. Affective responses following system messages were assessed employing a multi-modal approach, using subjective rating scales as well as physiological measures. Results show that affective responses vary systematically depending on the type of message, and that spoken messages generally elicit more positive affect than written messages. Implications on how to enhance usersatisfaction by appropriate message design are discussed. |
BibTeX:
@article{Pfister*11,
author = {Pfister, H.-R. and Wollstädter, S. and Peter, C. },
title = {Affective Responses to System Messages in Human-Computer-Interaction: Effects of Modality and Message Type},
journal = {Interacting with Computers},
year = {2011},
volume = {23},
pages = {372-383},
doi = {http://dx.doi.org/10.1016/j.intcom.2011.05.006}
}
|
| Roth, P.M., Settgast, V., Widhalm, P., Lancelle, M., Birchbauer, J., Brändle, N., Havemann, S. & Bischof, H., (2011), "Next-Generation 3D Visualization for Visual Surveillance", 2011 8th IEEE International Conference on Advanced Video and Signal-Based Surveillancei (AVSS), pp.6.
[Abstract] [BibTeX] [PDF] |
| Abstract: Existing visual surveillance systems typically require that a human operator observes video streams from different cameras. Since, due to the ever increasing number of cameras, this becomes more and more infeasible, automatic systems are required. However, such systems can often not cope with complex scenes and are not reliable enough. Thus, in this paper, we present a novel combination between automatic visual surveillance systems and interactive visualization methods. Our novel visualization takes advantage of a high resolution display and given 3D information to focus the operator's attention to interesting/critical areas of the observed area. This is realized by embedding the results of automatic scene analysis techniques into the visualization. By providing different visualization modes, the user can easily switch between the different modes and can select the mode which provides most information. The system is demonstrated for a real setup on a campus of an university. |
BibTeX:
@inproceedings{Roth*11avss,
author = {Roth, Peter M. and Settgast, Volker and Widhalm, Peter and Lancelle, Marcel and Birchbauer, Josef and Brändle, Norbert and Havemann, Sven and Bischof, Horst},
title = {Next-Generation 3D Visualization for Visual Surveillance},
booktitle = {2011 8th IEEE International Conference on Advanced Video and Signal-Based Surveillancei (AVSS)},
year = {2011},
pages = {6}
}
|
| Schiffer, T., Schinko, C., Ullrich, T. & Fellner, D.W., (2011), "Real-World Geometry and Generative Knowledge", Ercim News, Vol.86. |
BibTeX:
@article{Schiffer*11ercim,
author = {Schiffer, Thomas and Schinko, Christoph and Ullrich, Torsten and Fellner, Dieter W.},
title = {Real-World Geometry and Generative Knowledge},
journal = {Ercim News},
year = {2011},
volume = {86}
}
|
| Schinko, C., Strobl, M., Ullrich, T. & Fellner, D.W., (2011), "Scripting Technology for Generative Modeling", International Journal on Advances in Software, Vol.4(3-4), pp.308-326.
[Abstract] [BibTeX] [PDF] |
| Abstract: In the context of computer graphics, a generative model is the description of a three-dimensional shape: Each class of objects is represented by one algorithm M. Furthermore, each described object is a set of high-level parameters x, which reproduces the object, if an interpreter evaluates M(x). This procedural knowledge differs from other kinds of knowledge, such as declarative knowledge, in a significant way. Generative models are designed by programming. In order to make generative modeling accessible to non-computer scientists, we created a generative modeling framework based on the easy-to-use scripting language JavaScript (JS). Furthermore, we did not implement yet another interpreter, but a JS-translator and compiler. As a consequence, our framework can translate generative models from JavaScript to various platforms. In this paper we present an overview of Euclides and quintessential examples of supported platforms: Java, Differential Java, and GML. Java is a target language, because all frontend and framework components are written in Java making it easier to be embedded in an integrated development environment. The Differential Java backend can compute derivatives of functions, which is a necessary task in many applications of scientific computing, e.g., validating reconstruction and fitting results of laser scanned surfaces. The postfix notation of GML is very similar to that of Adobes Postscript. It allows the creation of high-level shape operators from low-level shape operators. The GML serves as a platform for a number of applications because it is extensible and comes with an integrated visualization engine. This innovative meta-modeler concept allows a user to export generative models to other platforms without losing its main feature -- the procedural paradigm. In contrast to other modelers, the source code does not need to be interpreted or unfolded, it is translated. Therefore, it can still be a very compact representation of a complex model. |
BibTeX:
@article{Schinko*11ijas,
author = {Schinko, Christoph and Strobl, Martin and Ullrich, Torsten and Fellner, Dieter W.},
title = {Scripting Technology for Generative Modeling},
journal = {International Journal on Advances in Software},
year = {2011},
volume = {4},
number = {3-4},
pages = {308-326}
}
|
| Schinko, C., Ullrich, T. & Fellner, D., (2011), "Simple and Efficient Normal Encoding with Error Bounds", Theory and Practice of Computer Graphics, pp.63-66, Eurographics.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Normal maps and bump maps are commonly used techniques to make 3D scenes more realistic. Consequently, the efficient storage of normal vectors is an important task in computer graphics. This work presents a fast, lossy compression/decompression algorithm for arbitrary resolutions. The complete source code is listed in the appendix and is ready to use. |
BibTeX:
@inproceedings{Schinko*11tpcg,
author = {Christoph Schinko and Torsten Ullrich and Dieter Fellner},
title = {Simple and Efficient Normal Encoding with Error Bounds},
booktitle = {Theory and Practice of Computer Graphics},
publisher = {Eurographics},
year = {2011},
pages = {63-66},
doi = {http://dx.doi.org/10.2312/LocalChapterEvents/TPCG/TPCG11/063-065}
}
|
| Schröder, M., Pirker, H., Lamolle, M., Burkhardt, F., Peter, C. & Zovato, E., Petta, P., Cowie, R. & Pelachaud, C. (ed.) (2011), "Representing emotions and related states in technological systems", Emotion-Oriented Systems - The Humaine Handbook, pp.367-386, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: In many cases when technological systems are to operate on emotions and related states, they need to represent these states. Existing representations are limited to application-specific solutions that fall short of representing the full range of concepts that have been identified as relevant in the scientific literature. The present chapter presents a broad conceptual view on the possibility to create a generic representation of emotions that can be used in many contexts and for many purposes. Potential use cases and resulting requirements are identified and compared to the scientific literature on emotions. Options for the practical realisation of an Emotion Markup Language are discussed in the light of the requirement to extend the language to different emotion concepts and vocabularies, and ontologies are investigated as a means to provide limited "mapping" mechanisms between different emotion representations. |
BibTeX:
@incollection{Schroeder*11,
author = {Schröder, M. and Pirker, H. and Lamolle, M. and Burkhardt, F. and Peter, C. and Zovato, E},
editor = {Petta, P. and Cowie, R. and Pelachaud, C. },
title = {Representing emotions and related states in technological systems},
booktitle = {Emotion-Oriented Systems - The Humaine Handbook},
publisher = {Springer},
year = {2011},
pages = {367-386},
doi = {http://dx.doi.org/10.1007/978-3-642-15184-2_19}
}
|
| Schröder, M., Baggia, P., Burkhardt, F., Pelachaud, C., Peter, C. & Zovato, E., (2011), "EmotionML -- an upcoming standard for representing emotions and related states", Proc. Affective Computing and Intelligent Interaction, Vol.6975, pp.316-325, Springer.
[Abstract] [BibTeX] [PDF] |
| Abstract: The present paper describes the specification of Emotion Markup Language (EmotionML) 1.0, which is undergoing standardisation at the World Wide Web Consortium (W3C). The language aims to strike a balance between practical applicability and scientific wellfoundedness. We briefly review the history of the process leading to the standardisation of EmotionML. We describe the syntax of EmotionML as well as the vocabularies that are made available to describe emotions in terms of categories, dimensions, appraisals and/or action tendencies. The paper concludes with a number of relevant aspects of emotion that are not covered by the current specification. |
BibTeX:
@inproceedings{Schroeder*11lncs,
author = {Marc Schröder and Paolo Baggia and Felix Burkhardt and Catherine Pelachaud and Christian Peter and Enrico Zovato},
title = {EmotionML -- an upcoming standard for representing emotions and related states},
booktitle = {Proc. Affective Computing and Intelligent Interaction},
publisher = {Springer},
year = {2011},
volume = {6975},
pages = {316-325}
}
|
| Schröder, M., Baggia, P., Burkhardt, F., Pelachaud, C., Peter, C. & Zovato, E., (2011), "Emotion Markup Language (EmotionML) 1.0 ". |
| Abstract: As the web is becoming ubiquitous, interactive, and multimodal, technology needs to deal increasingly with human factors, including emotions. The specification of Emotion Markup Language 1.0 aims to strike a balance between practical applicability and scientific well-foundedness. The language is conceived as a 'plug-in' language suitable for use in three different areas: (1) manual annotation of data; (2) automatic recognition of emotion-related states from user behavior; and (3) generation of emotion-related system behavior. |
BibTeX:
@techreport{Schroeder*11TR,
author = {M. Schröder and P. Baggia and F. Burkhardt and C. Pelachaud and Christian Peter and E. Zovato},
title = {Emotion Markup Language (EmotionML) 1.0 },
year = {2011},
note = {http://www.w3.org/TR/emotionml/}
}
|
| Schröder, M., Pelachaud, C., Ashimura, K., Baggia, P., Burkhardt, F., Oltramari, A., Peter, C. & Zovato, E., (2011), "Vocabularies for EmotionML". |
| Abstract: This document provides a list of emotion vocabularies that can be used with EmotionML to represent emotions and related states. EmotionML provides mechanisms to represent emotions in terms of scientifically valid descriptors: categories, dimensions, appraisals, and action tendencies. Given the lack of agreement in the community, EmotionML does not provide a single vocabulary of emotion terms, but gives users a choice to select the most suitable emotion vocabulary in their annotations. In order to promote interoperability, publicly defined vocabularies should be used where possible and reasonable from the point of view of the target application. The present document provides a number of emotion vocabularies that can be used for this purpose. |
BibTeX:
@techreport{Schroeder*11TR2,
author = {Schröder, M. and Pelachaud, C. and Ashimura, K. and Baggia, P. and Burkhardt, F. and Oltramari, A. and Peter, C. and Zovato, E.},
title = {Vocabularies for EmotionML},
year = {2011},
note = {http://www.w3.org/TR/emotion-voc/}
}
|
| Schwenk, K., Behr, J. & Fellner, D.W., (2011), "An Error Bound for Decoupled Visibility with Application to Relighting", Eurographics 2011. Short Papers, pp.25-28, Eurographics Association.
[Abstract] [BibTeX] [PDF] |
| Abstract: Monte Carlo estimation of direct lighting is often dominated by visibility queries. If an error is tolerable, the calculations can be sped up by using a simple scalar occlusion factor per light source to attenuate radiance, thus decoupling the expensive estimation of visibility from the comparatively cheap sampling of unshadowed radiance and BRDF. In this paper we analyze the error associated with this approximation and derive an upper bound. We demonstrate in a simple relighting application how our result can be used to reduce noise by introducing a controlled error if a reliable estimate of the visibility is already available. |
BibTeX:
@inproceedings{Schwenk*11EG,
author = {Schwenk, Karsten and Behr, Johannes and Fellner, Dieter W.},
title = {An Error Bound for Decoupled Visibility with Application to Relighting},
booktitle = {Eurographics 2011. Short Papers},
publisher = {Eurographics Association},
year = {2011},
pages = {25-28}
}
|
| Schwenk, K., Behr, J. & Fellner, D.W., (2011), "CommonVolumeShader: Simple and Portable Specification of Volumetric Light Transport in X3D", Proceedings Web3D 2011, pp.39-44, ACM Press, New York.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: A new technology is on the rise that allows the 3D-reconstruction of Cultural Heritage objects from image sequences taken by ordinary digital cameras. We describe the first experiments we made as early adopters in a community-funded research project whose goal is to develop it into a standard CH technology. The paper describes in detail a step-by-step procedure that can be reproduced using free tools by any CH professional. We also give a critical assessment of the workflow and describe several ideas for developing it further into an automatic procedure for 3D reconstruction from images. |
BibTeX:
@inproceedings{Schwenk*11web3d,
author = {Schwenk, Karsten and Behr, Johannes and Fellner, Dieter W.},
title = {CommonVolumeShader: Simple and Portable Specification of Volumetric Light Transport in X3D},
booktitle = {Proceedings Web3D 2011},
publisher = {ACM Press, New York},
year = {2011},
pages = {39-44},
doi = {http://dx.doi.org/10.1145/2010425.2010432}
}
|
| Thaller, W., Krispel, U., Havemann, S., Redi, I., Redi, A. & Fellner, D., Remondino, F. & El-Hakim, S. (ed.) (2011), "Developing Parametric Building Models - the GANDIS Use Case", Proceedings of the 4th ISPRS International Workshop 3D-ARCH 2011, ISPRS.
[Abstract] [BibTeX] [PDF] |
| Abstract: In the course of a project related to green building design, we have created a group of eight parametric building models that can be manipulated interactively with respect to dimensions, number of floors, and a few other parameters. We report on the commonalities and differences between the models and the abstractions that we were able to identify. |
BibTeX:
@inproceedings{Thaller*10gandis,
author = {Wolfgang Thaller and Ulrich Krispel and Sven Havemann and Ivan Redi and Andrea Redi and Dieter Fellner},
editor = {Fabio Remondino and Sabry El-Hakim},
title = {Developing Parametric Building Models - the GANDIS Use Case},
booktitle = {Proceedings of the 4th ISPRS International Workshop 3D-ARCH 2011},
publisher = {ISPRS},
year = {2011}
}
|
| Tzompanaki, K., Doerr, M., Theodoridou, M. & Havemann, S., (2011), "3D-COFORM: A Large-Scale Digital Production Environment", Ercim News, Vol.86, pp.18-19.
[Abstract] [BibTeX] [PDF] |
| Abstract: The systematic large-scale production of digital scientific objects, such as 3D models, requires much more infrastructure than a classical digital archive connected to a workflow manager. The size of the data to be handled, the distribution of expertise, acquisition and production sites, and the complexity of the processes involved require an innovative integrated environment that combines content management and information retrieval (IR) services with a centralized knowledge management in order to monitor, manage and document processes and products in a flexible manner. |
BibTeX:
@article{Tzompanaki*11Ercim,
author = {Tzompanaki, Katerina and Doerr, Martin and Theodoridou, Maria and Havemann, Sven},
title = {3D-COFORM: A Large-Scale Digital Production Environment},
journal = {Ercim News},
year = {2011},
volume = {86},
pages = {18-19},
note = {European Research Consortium for Informatics and Mathematics}
}
|
| Ullrich, T., Schiffer, T., Schinko, C. & Fellner, D.W., (2011), "Variance Analysis and Comparison in Computer-Aided Design", Proceedings of the 4th ISPRS International Workshop 3D-ARCH 2011, pp.5.
[Abstract] [BibTeX] [PDF] |
| Abstract: The need to analyze and visualize differences of very similar objects arises in many research areas: mesh compression, scan alignment, nominal/actual value comparison, quality management, and surface reconstruction to name a few. In computer graphics, for example, differences of surfaces are used for analyzing mesh processing algorithms such as mesh compression. They are also used to validate reconstruction and fitting results of laser scanned surfaces. As laser scanning has become very important for the acquisition and preservation of artifacts, scanned representations are used for documentation as well as analysis of ancient objects. Detailed mesh comparisons can reveal smallest changes and damages. These analysis and documentation tasks are needed not only in the context of cultural heritage but also in engineering and manufacturing. Differences of surfaces are analyzed to check the quality of productions. Our contribution to this problem is a workflow, which compares a reference / nominal surface with an actual, laser-scanned data set. The reference surface is a procedural model whose accuracy and systematics describe the semantic properties of an object; whereas the laser-scanned object is a real-world data set without any additional semantic information. |
BibTeX:
@inproceedings{Ullrich*11arch3d,
author = {Ullrich, Torsten and Schiffer, Thomas and Schinko, Christoph and Fellner, Dieter W.},
title = {Variance Analysis and Comparison in Computer-Aided Design},
booktitle = {Proceedings of the 4th ISPRS International Workshop 3D-ARCH 2011},
year = {2011},
pages = {5}
}
|
| Ullrich, T. & Fellner, D.W., Laga, H., Schreck, T., Ferreira, A., Godil, A., Pratikakis, I. & Veltkamp, R. (ed.) (2011), "Generative Object Definition and Semantic Recognition", 3D Object Retrieval 2011, Eurographics Symposium Proceedings, pp.1-8, Eurographics Association.
[Abstract] [BibTeX] [PDF] |
| Abstract: What is the difference between a cup and a door? These kinds of questions have to be answered in the context of digital libraries. This semantic information, which describes an object on a high, abstract level, is needed in order to provide digital library services such as indexing, markup and retrieval. In this paper we present a new approach to encode and to extract such semantic information. We use generative modeling techniques to describe a class of objects: each class is represented by one algorithm; and each object is one set of high-level parameters, which reproduces the object if passed to the algorithm. Furthermore, the algorithm is annotated with semantic information, i.e. a human-readable description of the object class it represents. We use such an object description to recognize objects in real-world data e.g. laser scans. Using an algorithmic object description, we are able to identify 3D subparts, which can be described and generated by the algorithm. Furthermore, we can determine the needed input parameters. In this way, we can classify objects, recognize them semantically and we can determine their parameters (cup's height, radius, etc.) |
BibTeX:
@inproceedings{Ullrich-Fellner*11eg3dor,
author = {Torsten Ullrich and Dieter W. Fellner},
editor = {H. Laga and T. Schreck and A. Ferreira and A. Godil and I. Pratikakis and R. Veltkamp},
title = {Generative Object Definition and Semantic Recognition},
booktitle = {3D Object Retrieval 2011, Eurographics Symposium Proceedings},
publisher = {Eurographics Association},
year = {2011},
pages = {1-8}
}
|
| Ullrich, T. & Fellner, D.W., (2011), "Linear Algorithms in Sublinear Time -- a tutorial on statistical estimation", IEEE Computer Graphics and Applications, Vol.31(2), pp.58-66.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: In this tutorial we present techniques of probability theory to boost linear algorithms. The main idea is based on statistics and uses educated guesses instead of comprehensive calculations. As estimates can be calculated in sublinear time, many algorithms can benefit from statistical estimation. In our examples linear algorithms are boosted significantly without negative effects on the algorithms results. We demonstrate this technique on a RANSAC algorithm, an image processing algorithm and on a geometrical reconstruction. The theoretic foundation of this techniques take advantage of the fact that in many cases the amount of information in a data set increases asymptotically sublinear if its size or sampling density increases. Conversely, an algorithm with expected sublinear running time can extract most information. |
BibTeX:
@article{Ullrich-Fellner10cga,
author = {Ullrich, Torsten and Fellner, Dieter W.},
title = {Linear Algorithms in Sublinear Time -- a tutorial on statistical estimation},
journal = {IEEE Computer Graphics and Applications},
year = {2011},
volume = {31},
number = {2},
pages = {58-66},
doi = {http://dx.doi.org/10.1109/MCG.2010.21}
}
|
| Ullrich, T., (2011), "Reconstructive Geometry".
[Abstract] [BibTeX] [PDF] |
| Abstract: The thesis "Reconstructive Geometry" by TORSTEN ULLRICH presents a new collision detection algorithm, a novel approach to generative modeling, and an innovative shape recognition technique. All these contributions are centred around the questions "how to combine acquisition data with generative model descriptions" and "how to perform this combination efficiently". Acquisition data - such as point clouds and triangle meshes - are created e.g. by a 3D scanner or a photogrammetric process. They can describe a shape's geometry very well, but do not contain any semantic information. With generative descriptions it's the other way round: a procedure describes a rather ideal object and its construction process. This thesis builds a bridge between both types of geometry descriptions and combines them to a semantic unit. An innovative shape recognition technique, presented in this thesis, determines whether a digitized real-world object might have been created by a given generative description, and if so, it identifies the high-level parameters that have been passed to the generative script. Such a generative script is a simple JavaScript function. Using the generative modeling compiler "Euclides" the function can be understood in a mathematical sense; i.e. it can be differentiated with respect to its input parameters, it can be embedded into an objective function, and it can be optimized using standard numerical analysis. This approach offers a wide range of applications for generative modeling techniques; parameters do not have to be set manually - they can be set automatically according to a reasonable objective function. In case of shape recognition, the objective function is distance-based and measures the similarity of two objects. The techniques that are used to efficiently perform this task (space partitioning, hierarchical structures, etc.) are the same in collision detection where the question, whether two objects have distance zero, is answered. To sum up, distance functions and distance calculations are a main part of this thesis along with their application in geometric object descriptions, semantic enrichment, numerical analysis and many more. |
BibTeX:
@phdthesis{Ullrich11:PhD,
author = {Ullrich, Torsten},
title = {Reconstructive Geometry},
school = {TU Graz, Diss., 2011},
year = {2011},
note = {322 p.}
}
|
| Weber, D., Peña Serna, S., Stork, A. & Fellner, D.W., (2011), "Rapid CFD for the Early Conceptual Design Phase", The Integration of CFD into the Product Development Process, pp.9, NAFEMS, Glasgow.
[Abstract] [BibTeX] [PDF] |
| Abstract: An important step of the product development is the optimization of the components' physical behavior, which is usually done in a costly iterative process. Besides the modification, simplification, and (re-) meshing of the component's geometry, simulating its behavior can take hours or even days. In the early conceptual design phase, different material properties and shapes need to be tested and compared, in order to optimally design the component. Nonetheless, time consuming simulations limit the realm of possibilities. We have developed a framework for enabling rapid Computational Fluid Dynamics (CFD) for the early conceptual design phase. In order to achieve this, we combine the computation and visualization of 2D fluid flow in real time with the modification of fluid parameters, boundary conditions and geometry. This allows for the rapid assessment and analysis of different shapes and therefore the optimization of the component. Our framework is completely based on graphic processing units (GPUs), i.e., all computations are performed on the GPU avoiding costly memory transfers between graphic hardware and CPU memory. The computations are performed on a single desktop PC, thus the simulation results can reside in GPU memory and can directly be visualized. B-Spline curves are used for modelling the geometry and the user can interactively modify it by means of inserting and moving control points or applying local smooth deformations, with the corresponding rapid update of the discretization on the GPU. Computing one single time step is performed in fractions of a second, even if the fluid flow is modelled with about one million degrees of freedom. The fast geometric manipulation combined with the direct visualization of quantities like velocity or pressure field allows for an immediate feedback of shape or parameter changes. Although fast simulations do not yet achieve the high precision compared to conventional simulations, their results are suitable for analyzing trends. |
BibTeX:
@inproceedings{Weber*11cfd,
author = {Weber, Daniel and Peña Serna, Sebastian and Stork, André and Fellner, Dieter W.},
title = {Rapid CFD for the Early Conceptual Design Phase},
booktitle = {The Integration of CFD into the Product Development Process},
publisher = {NAFEMS, Glasgow},
year = {2011},
pages = {9}
}
|
| Weber, D., Kalbe, T., Stork, A., Fellner, D.W. & Goesele, M., (2011), "Interactive Deformable Models with Quadratic Bases in Bernstein-Bézier-Form", The Visual Computer, Vol.27(6-8), pp.473-483.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present a physically based interactive simulation technique for de formable objects. Our method models the geometry as well as the displacements using quadratic basis functions in Bernstein-Bézier form on a tetrahedral finite element mesh. The Bernstein-Bézier formulation yields significant advantages compared to approaches using the monomial form. The implementation is simplified, as spatial derivatives and integrals of the displacement field are obtained analytically avoiding the need for numerical evaluations of the elements' stiffness matrices. We introduce a novel traversal accounting for adjacency in order to accelerate the reconstruction of the global matrices. We show that our proposed method can compensate the additional effort introduced by the co-rotational formulation to a large extent. We validate our approach on several models and demonstrate new levels of accuracy and performance in comparison to current state-of-the-art. |
BibTeX:
@article{Weber*11vc,
author = {Weber, Daniel and Kalbe, Thomas and Stork, André and Fellner, Dieter W. and Goesele, Michael},
title = {Interactive Deformable Models with Quadratic Bases in Bernstein-Bézier-Form},
journal = {The Visual Computer},
year = {2011},
volume = {27},
number = {6-8},
pages = {473-483},
doi = {http://dx.doi.org/10.1007/s00371-011-0579-6}
}
|
2010 |
| Augsdörfer, U.H., Dodgson, N.A. & Sabin, M.A., (2010), "Variations on the four-point subdivision scheme ", Computer Aided Geometric Design, Vol.27(1), pp.78-95, Elsevier Science Publishers B. V.. |
| Abstract: A step of subdivision can be considered to be a sequence of simple, highly local stages. By manipulating the stages of a subdivision step we can create families of schemes, each designed to meet different requirements. We postulate that such modification can lead to improved behaviour. We demonstrate this using the four-point scheme as an example. We explain how it can be broken into stages and how these stages can be manipulated in various ways. Six variants that all improve on the quality of the limit curve are presented and analysed. We present schemes which perfectly preserve circles, schemes which improve the Hölder continuity, and schemes which relax the interpolating property to achieve higher smoothness. |
BibTeX:
@article{Augsdoerfer*10cagd,
author = {Ursula H. Augsdörfer and Neil A. Dodgson and Malcolm A. Sabin},
title = {Variations on the four-point subdivision scheme },
journal = {Computer Aided Geometric Design},
publisher = {Elsevier Science Publishers B. V.},
year = {2010},
volume = {27},
number = {1},
pages = {78-95},
doi = {http://dx.doi.org/10.1016/j.cagd.2009.09.002}
}
|
| Behr, J., Jung, Y., Keil, J., Drevensek, T., Zöllner, M., Eschler, P. & Fellner, D.W., (2010), "A Scalable Architecture for the HTML5 / X3D Integration Model X3DOM", Proceedings Web3D 2010, pp.185-193, ACM Press, New York.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present a scalable architecture, which implements and further evolve the HTML/X3D integration model X3DOM introduced in [Behr et al. 2009]. The goal of this model is to integrate and update declarative X3D content directly in the HTML DOM tree. The model was previously presented in a very abstract and generic way by only suggesting implementation strategies. The available opensource x3dom.js architecture provides concrete solutions to the previously open points and extents the generic model if necessary. The outstanding feature of the architecture is to provide a single declarative interface to application developers and at the same time support of various backends through a powerful fallback-model. This fallback-model does not provide a single implementation strategy for the runtime and rendering module but supports different methods transparently. This includes native browser implementations and X3D-plugins as well as a WebGL-based scene-graph, which allows running the content without the need for installing additional plugins on all browsers that support WebGL. The paper furthermore discusses generic aspects of the architecture like encoding and introspection, but also provides details concerning two backends. It shows how the system interfaces with X3D-plugins and WebGL and also discusses implementation specific features and limitations. |
BibTeX:
@inproceedings{Behr*10web3d,
author = {Behr, Johannes and Jung, Yvonne and Keil, Jens and Drevensek, Timm and Zöllner, Michael and Eschler, Peter and Fellner, Dieter W.},
title = {A Scalable Architecture for the HTML5 / X3D Integration Model X3DOM},
booktitle = {Proceedings Web3D 2010},
publisher = {ACM Press, New York},
year = {2010},
pages = {185-193},
doi = {http://dx.doi.org/10.1145/1836049.1836077}
}
|
| Bernard, Jü., Brase, J., Fellner, D.W., Koepler, O., Kohlhammer, Jö., Ruppert, T., Schreck, T. & Sens, I., Bentes, C. & et al. (ed.) (2010), "A Visual Digital Library Approach for Time-Oriented Scientific Primary Data", Research and Advanced Technology for Digital Libraries, pp.352-363.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Digital Library support for textual and certain types of non-textual documents has significantly advanced over the last years. While Digital Library support implies many aspects along the whole library workflow model, interactive and visual retrieval allowing effective query formulation and result presentation are important functions. Recently, new kinds of non-textual documents which merit Digital Library support, but yet cannot be accommodated by existing Digital Library technology, have come into focus. Scientific primary data, as produced for example, by scientific experimentation, earth observation, or simulation, is such a data type. We report on a concept and first implementation of Digital Library functionality, supporting visual retrieval and exploration in a specific important class of scientific primary data, namely, time-oriented data. The approach is developed in an interdisciplinary effort by experts from the library, natural sciences, and visual analytics communities. In addition to presenting the concept and discussing relevant challenges, we present results from a first implementation of our approach as applied on a real-world scientific primary data set. |
BibTeX:
@inproceedings{Bernard*10ecdl,
author = {Bernard, Jürgen and Brase, Jan and Fellner, Dieter W. and Koepler, Oliver and Kohlhammer, Jörn and Ruppert, Tobias and Schreck, Tobias and Sens, Irina},
editor = {Bentes, Cristiana and et al.},
title = {A Visual Digital Library Approach for Time-Oriented Scientific Primary Data},
booktitle = {Research and Advanced Technology for Digital Libraries},
year = {2010},
pages = {352-363},
doi = {http://dx.doi.org/10.1007/978-3-642-15464-5_35}
}
|
| Blümel, I., Berndt, R., Ochmann, S., Vock, R. & Wessel, R., (2010), "PROBADO3D -- Indexing and Searching 3D CAD Databases: Supporting Planning through Content-Based Indexing and 3D Shape Retrieval", Proceedings International Conference on Design and Decision Support Systems in Architecture and Urban Planning, pp.411-425.
[BibTeX] [PDF] |
BibTeX:
@inproceedings{Berndt*10ddss,
author = {Ina Blümel and Rene Berndt and Sebastian Ochmann and Richard Vock and Raoul Wessel},
title = {PROBADO3D -- Indexing and Searching 3D CAD Databases: Supporting Planning through Content-Based Indexing and 3D Shape Retrieval},
booktitle = {Proceedings International Conference on Design and Decision Support Systems in Architecture and Urban Planning},
year = {2010},
pages = {411--425}
}
|
| Berndt, R., Blümel, I., Clausen, M., Damm, D., Diet, Jü., Fellner, D.W., Fremerey, C., Klein, R., Scherer, M., Schreck, T., Sens, I., Thomas, V. & Wessel, R., Lalmas, M. & et al. (ed.) (2010), "The PROBADO Project -- Approach and Lessons Learned in Building a Digital Library System for Heterogeneous Non-textual Documents", Research and Advanced Technology for Digital Libraries, 14th European Conference ECDL. Proceedings ECDL 2010, Vol.6273, pp.376-383, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: The PROBADO Project is a research effort to develop and operate advanced Digital Library support for non-textual documents. The main goal is to contribute to all parts of the Digital Library work flow from content acquisition over indexing to search and presentation. While not limited in terms of supported document types, reference support is developed for classical digital music and 3D architectural models. In this paper, we review the overall goals, approaches taken, and lessons learned so far in a highly integrated effort of university researchers and library experts. We address the problem of technology transfer, aspects of repository compilation, and the problem of inter-domain retrieval. The experiences are relevant for other project efforts in the non-textual Digital Library domain. |
BibTeX:
@inproceedings{Berndt*10ecdl,
author = {Berndt, Rene and Blümel, Ina and Clausen, Michael and Damm, David and Diet, Jürgen and Fellner, Dieter~W. and Fremerey, Christian and Klein, Reinhard and Scherer, Maximilian and Schreck, Tobias and Sens, Irina and Thomas, Verena and Wessel, Raoul},
editor = {Lalmas, Mounia and et al.},
title = {The PROBADO Project -- Approach and Lessons Learned in Building a Digital Library System for Heterogeneous Non-textual Documents},
booktitle = {Research and Advanced Technology for Digital Libraries, 14th European Conference ECDL. Proceedings ECDL 2010},
publisher = {Springer},
year = {2010},
volume = {6273},
pages = {376--383},
doi = {http://dx.doi.org/10.1007/978-3-642-15464-5_37}
}
|
| Berndt, R., Blümel, I. & Wessel, R., (2010), "PROBADO3D -- Towards an Automatic Multimedia Indexing Workflow for Architectural 3D Models", ELPUB 2010 - Publishing in the networked world: transforming the nature of communication, pp.79-88.
[BibTeX] [PDF] |
BibTeX:
@inproceedings{Berndt*10elpub,
author = {R. Berndt and I. Blümel and R. Wessel},
title = {PROBADO3D -- Towards an Automatic Multimedia Indexing Workflow for Architectural 3D Models},
booktitle = {ELPUB 2010 - Publishing in the networked world: transforming the nature of communication},
year = {2010},
pages = {79-88}
}
|
| Berndt, R., Buchgraber, G., Havemann, S., Settgast, V. & Fellner, D.W., Ioannides, M., Fellner, D.W., Georgopoulos, A. & Hadjimitsis, D. (ed.) (2010), "A Publishing Workflow for Cultural Heritage Artifacts from 3D-Reconstruction to Internet Presentation", Digital Heritage. Third International Conference, EuroMed 2010, Vol.6436, pp.166-178, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Publishing cultural heritage as 3D models with embedded annotations and additional information on the web is still a major challenge. This includes the acquisition of the digital 3D model, the authoring and editing of the additional information to be attached to the digital model as well as publishing it in a suitable format. These steps usually require very expensive hardware and software tools. Especially small museums cannot afford an expensive scanning campaign in order to generate the 3D models from the real artefacts. In this paper we propose an affordable publishing workflow from acquisition of the data to authoring and enriching it with the related metadata and information to finally publish it in a way suitable for access by means of a web browser over the internet. All parts of the workflow are based on open source solutions and free services. |
BibTeX:
@inproceedings{Berndt*10euromed,
author = {Rene Berndt and Gerald Buchgraber and Sven Havemann and Volker Settgast and Dieter W.~Fellner},
editor = {Ioannides, Marinos and Fellner, Dieter~W. and Georgopoulos, Andreas and Hadjimitsis, Diofantos},
title = {A Publishing Workflow for Cultural Heritage Artifacts from 3D-Reconstruction to Internet Presentation},
booktitle = {Digital Heritage. Third International Conference, EuroMed 2010},
publisher = {Springer},
year = {2010},
volume = {6436},
pages = {166-178},
doi = {http://dx.doi.org/10.1007/978-3-642-16873-4_13}
}
|
| Berndt, R., Blümel, I. & Wessel, R., (2010), "PROBADO3D -- New Ways of Indexing and Experiencing Architectural 3D Databases", Proceedings of FOCUS K3D Conference on Semantic 3D Media and Content, pp.89-90, INRIA.
[Abstract] [BibTeX] [PDF] |
| Abstract: Nowadays, in Digital Libraries, non-textual documents are indexed and accessed based on textual meta data. This kind of meta data is expensive to obtain, and in many cases, the content cannot be described completely and free of ambiguities. PROBADO3D aims to overcome this limitation by developing content-based access methods for 3D models in the architectural domain. |
BibTeX:
@inproceedings{Berndt*10focus,
author = {R. Berndt and I. Blümel and R. Wessel},
title = {PROBADO3D -- New Ways of Indexing and Experiencing Architectural 3D Databases},
booktitle = {Proceedings of FOCUS K3D Conference on Semantic 3D Media and Content},
publisher = {INRIA},
year = {2010},
pages = {89-90}
}
|
| Berndt, R., Blümel, I., Clausen, M., Damm, D., Diet, Jü., Fellner, D.W., Fremerey, C., Klein, R., Scherer, M., Schreck, T., Sens, I., Thomas, V. & Wessel, R., Mittermaier, B. (ed.) (2010), "Aufbau einer verteilten digitalen Bibliothek für nichttextuelle Dokumente -- Ansatz und Erfahrungen des PROBADO Projekts", eLibrary -- den Wandel gestalten, pp.219-236. |
BibTeX:
@inproceedings{Berndt*10wisskom,
author = {Rene Berndt and Ina Blümel and Michael Clausen and David Damm and Jürgen Diet and Dieter W.~Fellner and Christian Fremerey and Reinhard Klein and Maximilian Scherer and Tobias Schreck and Irina Sens and Verena Thomas and Raoul Wessel},
editor = {Bernhard Mittermaier},
title = {Aufbau einer verteilten digitalen Bibliothek für nichttextuelle Dokumente -- Ansatz und Erfahrungen des PROBADO Projekts},
booktitle = {eLibrary -- den Wandel gestalten},
year = {2010},
pages = {219--236}
}
|
| Binotto, A., Daniel, C.G., Weber, D., Kuijper, A., Stork, A., Pereira, C.E. & Fellner, D.W., (2010), "Iterative SLE Solvers over a CPU-GPU Platform", Proceedings 12th IEEE International Conference on High Performance Computing and Communications, pp.305-313.
[Abstract] [BibTeX] [PDF] |
| Abstract: GPUs (Graphics Processing Units) have become one of the main co-processors that contributed to desktops towards high performance computing. Together with multi-core CPUs, a powerful heterogeneous execution platform is built for massive calculations. To improve application performance and explore this heterogeneity, a distribution of workload in a balanced way over the PUs (Processing Units) plays an important role for the system. However, this problem faces challenges since the cost of a task at a PU is non-deterministic and can be influenced by several parameters not known a priori, like the problem size domain. We present a comparison of iterative SLE (Systems of Linear Equations) solvers, used in many scientific and engineering applications, over a heterogeneous CPU-GPUs platform and characterize scenarios where the solvers obtain better performances. A new technique to improve memory access on matrix vector multiplication used by SLEs on GPUs is described and compared to standard implementations for CPU and GPUs. Such timing profiling is analyzed and break-even points based on the problem sizes are identified for this implementation, pointing whether our technique is faster to use GPU instead of CPU. Preliminary results show the importance of this study applied to a real-time CFD (Computational Fluid Dynamics) application with geometry modification. |
BibTeX:
@inproceedings{Binotto*10hpcc,
author = {Binotto, Alecio and Daniel, Christian G. and Weber, Daniel and Kuijper, Arjan and Stork, André and Pereira, Carlos Eduardo and Fellner, Dieter W.},
title = {Iterative SLE Solvers over a CPU-GPU Platform},
booktitle = {Proceedings 12th IEEE International Conference on High Performance Computing and Communications},
year = {2010},
pages = {305-313}
}
|
| Binotto, A., Pereira, C. & Fellner, D., (2010), "Towards Dynamic Reconfigurable Load-balancing for Hybrid Desktop Platforms", 2010 IEEE International Symposium on Parallel & Distributed Processing, Workshops and Phd Forum, pp.1-4, IEEE.
[Abstract] [BibTeX] [PDF] |
| Abstract: High-performance platforms are required by applications that use massive calculations. Actually, desktop accelerators (like the GPUs) form a powerful heterogeneous platform in conjunction with multi-core CPUs. To improve application performance on these hybrid platforms, load-balancing plays an important role to distribute workload. However, such scheduling problem faces challenges since the cost of a task at a Processing Unit (PU) is non-deterministic and depends on parameters that cannot be known a priori, like input data, online creation of tasks, scenario changing, etc. Therefore, self-adaptive computing is a potential paradigm as it can provide flexibility to explore computational resources and improve performance on different execution scenarios. This paper presents an ongoing PhD research focused on a dynamic and reconfigurable scheduling strategy based on timing profiling for desktop accelerators. Preliminary results analyze the performance of solvers for SLEs (Sy0stems of Linear Equations) over a hybrid CPU and multi-GPU platform applied to a CFD (Computational Fluid Dynamics) application. The decision of choosing the best solver as well as its scheduling must be performed dynamically considering online parameters in order to achieve a better application performance. |
BibTeX:
@inproceedings{Binotto*10ipdps,
author = {A. Binotto and C. Pereira and D. Fellner},
title = {Towards Dynamic Reconfigurable Load-balancing for Hybrid Desktop Platforms},
booktitle = {2010 IEEE International Symposium on Parallel & Distributed Processing, Workshops and Phd Forum},
publisher = {IEEE},
year = {2010},
pages = {1-4},
note = {10.1109/IPDPSW.2010.5470804}
}
|
| Binotto, A., Pedras, B., Götz, M., Kuijper, A., Pereira, C.E., Stork, A. & Fellner, D.W., (2010), "Effective Dynamic Scheduling on Heterogeneous MultiManycore Desktop Platforms", SBAC-PADW 2010, pp.37-42.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: GPUs (Graphics Processing Units) have become one of the main co-processors that contributed to desktops towards high performance computing. Together with multicore CPUs and other co-processors, a powerful heterogeneous execution platform is built on a desktop for data intensive calculations. In our perspective, we see the modern desktop as a heterogeneous cluster that can deal with several applications' tasks at the same time. To improve application performance and explore such heterogeneity, a distribution of workload over the asymmetric PUs (Processing Units) plays an important role for the system. However, this problem faces challenges since the cost of a task at a PU is non-deterministic and can be influenced by several parameters not known a priori, like the problem size domain. We present a context-aware architecture that maximizes application performance on such platforms. This approach combines a model for a first scheduling based on an offline performance benchmark with a runtime model that keeps track of tasks' real performance. We carried a demonstration using a CPU-GPU platform for computing iterative SLEs (Systems of Linear Equations) solvers using the number of unknowns as the main parameter for assignment decision. We achieved a gain of 38.3% in comparison to the static assignment of all tasks to the GPU (which is done by current programming models, such as OpenCL and CUDA for Nvidia). |
BibTeX:
@inproceedings{Binotto*10wammca,
author = {Binotto, Alecio and Pedras, Bernardo and Götz, Marcelo and Kuijper, Arjan and Pereira, Carlos Eduardo and Stork, Andre and Fellner, Dieter W.},
title = {Effective Dynamic Scheduling on Heterogeneous MultiManycore Desktop Platforms},
booktitle = {SBAC-PADW 2010},
year = {2010},
pages = {37-42},
doi = {http://dx.doi.org/10.1109/SBAC-PADW.2010.6}
}
|
| Buchgraber, G., Berndt, R. & Fellner, D.W., (2010), "FO3D -- Formatting Objects for PDF3D", Proceedings Web3D 2010, Proceedings of the 15th International Conference on Web 3D Technology, pp.63-71.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: 3D is useful in many real-world applications beyond computer games. The efficiency of communication is greatly enhanced by combining interlinked verbal descriptions with 3D content. However, there is a wide gap between the great demand for 3D content and the inconvenience and cost of delivering it. We propose using PDF, which is extremely well supported by standard content production workflows. Producing PDF with embedded 3D is currently not an easy task. As a solution to the problem we offer a freely available tool that makes embedding 3D in PDF documents an easy to use technology. Our solution is very flexible, extensible, and can be easily integrated with existing document workflow technology. |
BibTeX:
@inproceedings{Buchgraber*10web3d,
author = {Gerald Buchgraber and René Berndt and Dieter~W. Fellner},
title = {FO3D -- Formatting Objects for PDF3D},
booktitle = {Proceedings Web3D 2010, Proceedings of the 15th International Conference on Web 3D Technology},
year = {2010},
pages = {63-71},
doi = {http://dx.doi.org/10.1145/1836049.1836059}
}
|
| Burkhardt, D., Hofmann, C., Nazemi, K., Stab, C., Breyer, M. & Fellner, D., (2010), "Intuitive Semantic-Editing for Regarding Needs of Domain-Experts", Proceedings of ED-Media 2010; World Conference on Educational Multimedia, Hypermedia & Telecommunications [online], pp.860-869, AACE. |
| Abstract: Ontologies are used to represent knowledge and their semantic information from different topics, to allow users a better way to explore knowledge and find information faster, because of the data-structuring. To achieve a well filled knowledgebase, editors have to be used, to enter new and to edit existing information. But most of the existing ontology-editors are designed for experienced ontology-experts. Experts from other topic fields e.g. physicians are often novices in the area of ontology-creating, they need adequate tools, which hide the complexity of ontology-structures. In the area of e-learning experts are also teachers as well. In this paper we will present a method, how the needs of domain-experts can be regarded and so an editor can designed, which allows an editing and adding of information by users without having experiences of creating ontologies. With such an editor domain-experts are able to commit their expert-knowledge into the ontology. |
BibTeX:
@inproceedings{Burkhardt*10edmedia,
author = {D. Burkhardt and C. Hofmann and K. Nazemi and C. Stab and M. Breyer and D. Fellner},
title = {Intuitive Semantic-Editing for Regarding Needs of Domain-Experts},
booktitle = {Proceedings of ED-Media 2010; World Conference on Educational Multimedia, Hypermedia & Telecommunications [online]},
publisher = {AACE},
year = {2010},
pages = {860-869}
}
|
| Burkhardt, D., Stab, C., Nazemi, K., Breyer, M. & Fellner, D., Chova, C.G., Belenguer, D.M. & Torres, I.C. (ed.) (2010), "Approaches for 3D-Visualizations and Knowledge Worlds for Exploratory Learning", Proc. International Conference on Education and New Learning Technologies [CD-ROM], pp.006427-006437, IATED.
[Abstract] [BibTeX] [PDF] |
| Abstract: Graphical knowledge representations open promising perspectives to support the explorative learning on web. 2D-visualization are recently evaluated as gainful knowledge exploration systems, whereas 3D-visualization systems did not find their way into web-based explorative learning. 3D-visualizations and '3D Knowledge Worlds', as virtual environment in context of e-learning, comprise a high degree of authenticity, because the used metaphors are known by the users from the real world. But different challenges like the usage of 3D-Knowledge World without losing the learning context and the focused learning goals are rarely investigated and considered. New technologies provide the opportunity to introduce 3D-visualizations and environments on web to support a web-based explorative learning. Therefore it is necessary to investigate the prospects of 3D-visualization for transferring and adopting knowledge on web. The following paper describes different approaches to use 3D-visualization and Knowledge Worlds for conveying knowledge on web-based systems using web-based contents. The approaches for 3D visualizations are classified into different layout algorithm and the knowledge worlds are classified interaction character. |
BibTeX:
@inproceedings{Burkhardt*10edulearn,
author = {D. Burkhardt and C. Stab and K. Nazemi and M. Breyer and D. Fellner},
editor = {C. Gomez Chova and D. Marti Belenguer and I. Candel Torres},
title = {Approaches for 3D-Visualizations and Knowledge Worlds for Exploratory Learning},
booktitle = {Proc. International Conference on Education and New Learning Technologies [CD-ROM]},
publisher = {IATED},
year = {2010},
pages = {006427-006437}
}
|
| Echizen, I., Pan, J.-S., Fellner, D.W., Nouak, A., Kuijper, A. & Jain, L.C. (ed.) (2010), "Sixth International Conference on Intelligent Information Hiding and Multimedia Signal Processing. Proceedings: IIH-MSP 2010", IEEE Computer Society, Los Alamitos, Calif.. |
BibTeX:
@proceedings{Echizen*10iih,,
editor = {Echizen, Isao and Pan, Jeng-Shyang and Fellner, Dieter W. and Nouak, Alexander and Kuijper, Arjan and Jain, Lakhmi C.},
title = {Sixth International Conference on Intelligent Information Hiding and Multimedia Signal Processing. Proceedings: IIH-MSP 2010},
publisher = {IEEE Computer Society, Los Alamitos, Calif.},
year = {2010}
}
|
| Fellner, D.W., Baier, K., Fey, T., Bornemann, H., Wehner, D. & Mentel, K. (ed.) (2010), "Annual Report 2009 : Fraunhofer Institute for Computer Graphics Research IGD", Fraunhofer-Institut für Graphische Datenverarbeitung (IGD). |
BibTeX:
@book{Fellner*10ar-igd,,
editor = {Fellner, Dieter W. and Baier, Konrad and Fey, Thekla and Bornemann, Heidrun and Wehner, Detlef and Mentel, Katrin},
title = {Annual Report 2009 : Fraunhofer Institute for Computer Graphics Research IGD},
publisher = {Fraunhofer-Institut für Graphische Datenverarbeitung (IGD)},
year = {2010}
}
|
| Fellner, D.W. & Schaub, J. (ed.) (2010), "Selected Readings in Computer Graphics 2009", Fraunhofer Verlag, Stuttgart. |
| Abstract: The Fraunhofer Institute for Computer Graphics Research IGD with offices in Darmstadt as well as in Rostock, Singapore, and Graz, the partner institutes at the respective universities, the Interactive Graphics Systems Group of Technische Universität Darmstadt, the Computergraphics and Communication Group of the Institute of Computer Science at Rostock University, Nanyang Technological University (NTU), Singapore, and the Visual Computing Cluster of Excellence of Graz University of Technology, cooperate closely within projects and research and development in the field of Computer Graphics. The 'Selected Readings in Computer Graphics 2009' consist of 38 articles selected from a total of 183 scientific publications contributed by all these institutions. All articles previously appeared in various scientific books, journals, conferences and workshops, and are reprinted with permission of the respective copyright holders. The publications had to undergo a thorough review process by internationally leading experts and established technical societies. Therefore, the Selected Readings should give a fairly good and detailed overview of the scientific developments in Computer Graphics in the year 2009. They are published by Professor Dieter W. Fellner, the director of Fraunhofer Institute for Computer Graphics Research IGD in Darmstadt, at the same time professor at the Department of Computer Science at Technische Universität Darmstadt, and professor at the Faculty of Computer Science at Graz University of Technology. |
BibTeX:
@book{Fellner*10sr,,
editor = {Fellner, Dieter W. and Schaub, Jutta},
title = {Selected Readings in Computer Graphics 2009},
publisher = {Fraunhofer Verlag, Stuttgart},
year = {2010}
}
|
| Doerr, M., Tzompanaki, K., Theodoridou, M., Georgis, C., Axaridou, A. & Havemann, S., (2010), "A Repository for 3D Model Production and Interpretation in Culture and Beyond", VAST 2010, pp.97-104.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: In order to support the work of researchers in the production, processing and interpretation of complex digital objects and the dissemination of valuable and diverse information to a broad spectrum of audience there is need for an integrated high performance environment that will combine knowledge base features with content management and information retrieval (IR) technologies. In this paper we describe the design and implementation of an integrated repository to ingest, store, manipulate, and export 3D Models, their related digital objects and metadata and to enable efficient access, use, reuse and preservation of the information, ensuring referential and semantic integrity. The repository design is based on an integrated coherent conceptual schema that models complex metadata regarding provenance information, structured models, formats, compatibility of 3D models, historical events and real world objects. This repository is not implemented just to be a storage location for digital objects; it is meant to be a working integrated platform for distant users who participate in a process chain consisting of several steps. A first prototype, in the field of Cultural Heritage, has already been implemented in the context of 3D-COFORM project, an integrated research project funded by the European Community's Seventh Framework Programme (FP7/2007-2013, no 231809) and the results are satisfactory, proving the feasibility of the design decisions which are absolutely new, ambitious, and extraordinarily generic for e-science. |
BibTeX:
@inproceedings{Havemann*10vast,
author = {Martin Doerr and Katerina Tzompanaki and Maria Theodoridou and Ch. Georgis and A. Axaridou and Sven Havemann},
title = {A Repository for 3D Model Production and Interpretation in Culture and Beyond},
booktitle = {VAST 2010},
year = {2010},
pages = {97-104},
doi = {http://dx.doi.org/10.2312/VAST/VAST10/097-104}
}
|
| Hofmann, C., Boettcher, U. & Fellner, D.W., (2010), "Change Awarness for Collaborative Video Annotation", Proceedings COOP 2010, pp.101-117, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Collaborative Video Annotation is a broad field of research and is widely used in productive environments. While it is easy to follow changes in small systems with few users, keeping in touch with all changes in large environments can easily get overwhelming. The easiest way and a first approach to prevent the users from getting lost are to show them all changes in an appropriate way. This list of changes can also become very large when many contributors add new information to shared data resources. To prevent users from getting lost while having a list of changes, this paper introduces a way to subscribe to parts of the system and only to have the relevant changes shown. To achieve this goal, the framework provides an approach to check the relevance of changes, which is not trivial in three dimensional spaces, and to be accumulated for later reference by the subscribing user. The benefit for users is to need fewer times to be up-to-date and to have more time for applying ownchanges. |
BibTeX:
@inproceedings{Hofmann*10coop,
author = {C. Hofmann and U. Boettcher and D.~W. Fellner},
title = {Change Awarness for Collaborative Video Annotation},
booktitle = {Proceedings COOP 2010},
publisher = {Springer},
year = {2010},
pages = {101--117},
doi = {http://dx.doi.org/10.1007/978-1-84996-211-7_7}
}
|
| Hofmann, C., Burkhardt, D., Breyer, M., Nazemi, K., Stab, C. & Fellner, D., (2010), "Towards a Workflow-Based Design of Multimedia Annotation Systems", Proceedings of ED-Media 2010; World Conference on Educational Multimedia, Hypermedia & Telecommunications [online], pp.1224-1233, AACE. |
| Abstract: Annotation techniques for multimedia contents have found their way into multiple areas of daily use as well as professional fields. A large number of research projects can be assigned to different specific subareas of digital annotation. Nevertheless, the annotation process, bringing out multiple workflows depending on different application scenarios, has not sufficiently been taken into consideration. A consideration of respective processes and workflows requires detailed knowledge about practices of digital multimedia annotation. In order to establish fundamental groundwork towards workflow-related research, this paper presents a comprehensive process model of multimedia annotation which results from a conducted empirical study. Furthermore, we provide a survey of the tasks that have to be accomplished by users and computing devices, tools and algorithms that are used to handle specific tasks, and types of data that are transferred between workflow steps. These aspects areassigned to the identified sub-processes of the model. |
BibTeX:
@inproceedings{Hofmann*10edmedia,
author = {C. Hofmann and D. Burkhardt and M. Breyer and K. Nazemi and C. Stab and D. Fellner},
title = {Towards a Workflow-Based Design of Multimedia Annotation Systems},
booktitle = {Proceedings of ED-Media 2010; World Conference on Educational Multimedia, Hypermedia & Telecommunications [online]},
publisher = {AACE},
year = {2010},
pages = {1224--1233}
}
|
| Hofmann, C. & Fellner, D.W., (2010), "Supporting Collaborative Workflows of Digital Multimedia Annotation", Proceedings COOP 2010, pp.79-99, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Collaborative annotation techniques for digital multimedia contents have found their way into a vast amount of areas of daily use as well as professional fields. Attendant research has issued a large number of research projects that can be assigned to different specific subareas of annotation. These projects focus on one or only few aspects of digital annotation. However, the whole annotation process as a operative unit has not sufficiently been taken into consideration, especially for the case of collaborative settings. In order to attend to that lack of research, we present a framework that supports multiple collaborative workflows related to digital multimedia annotation. In that context, we introduce a process-based architecture model, a formalized specification of collaborative annotation processes, and a concept for personalized workflow visualization and user assistance. |
BibTeX:
@inproceedings{Hofmann-Fellner10coop,
author = {C. Hofmann and D.~W. Fellner},
title = {Supporting Collaborative Workflows of Digital Multimedia Annotation},
booktitle = {Proceedings COOP 2010},
publisher = {Springer},
year = {2010},
pages = {79--99},
doi = {http://dx.doi.org/10.1007/978-1-84996-211-7_6}
}
|
| Hohmann, B., Havemann, S., Krispel, U. & Fellner, D., (2010), "A GML shape grammar for semantically enriched 3D building models", Computers & Graphics, Vol.34(4), pp.322-334.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: The creation of building and facility models is a tedious and complicated task. Existing CAD models are typically not well suited since they contain too much or not enough detail; the manual modeling approach does not scale; different views on the same model are needed, and different levels of detail and abstraction; and finally, conventional modeling tools are inappropriate for models with many internal parameter dependencies. As a solution to this problem we propose a combination of a procedural approach with shape grammars. The model is created in a top-down manner; high-level changeability and re-usability are much less of a problem; and it can be interactively evaluated to provide different views at runtime. We present some insights on the relation between imperative and declarative grammar descriptions, and show a detailed case study with facility surveillance as a practical application. |
BibTeX:
@article{Hohmann*10CG,
author = {B. Hohmann and S. Havemann and U. Krispel and D. Fellner},
title = {A GML shape grammar for semantically enriched 3D building models},
journal = {Computers & Graphics},
year = {2010},
volume = {34},
number = {4},
pages = {322-334},
doi = {http://dx.doi.org/10.1016/j.cag.2010.05.007}
}
|
| Huff, R., Neves, T., Gierlinger, T., Kuijper, A., Stork, A. & Fellner, D.W., (2010), "A General Two-Level Acceleration Structure for Interactive Ray Tracing on the GPU", Computer Graphics International 2010. Short Papers, pp.4.
[Abstract] [BibTeX] [PDF] |
| Abstract: Despite the superior image quality generated by ray tracing, programmers of time-critical applications have historically avoided it because of its computational costs. Nowadays, the hardware of modern desktops allows the execution of realtime ray tracers but requires a specialized implementation based on specific characteristics of each application, such as scene complexity, kinds of motion, ray distribution, model structure and hardware. The evaluation and development of these requirements are complex and time-consuming, especially for developers with no familiarity in rendering algorithms and graphics hardware programming. The aim of our work is to provide a general and practical method to efficiently execute interactive ray tracing in most systems. We considered the most common aspects of current computer graphics applications, like the use of a scene graph and support to static and dynamic objects. In addition, we also took into account the common desktop hardware. This led us to the development of a special acceleration structure and its implementation on the GPU. In this paper, we present the development of our work showing the combination of different techniques and our results. |
BibTeX:
@inproceedings{Huff*10cgi,
author = {Huff, Rafael and Neves, Tiago and Gierlinger, Thomas and Kuijper, Arjan and Stork, André and Fellner, Dieter W.},
title = {A General Two-Level Acceleration Structure for Interactive Ray Tracing on the GPU},
booktitle = {Computer Graphics International 2010. Short Papers},
year = {2010},
pages = {4}
}
|
| Huff, R., Neves, T., Gierlinger, T., Kuijper, A., Stork, A. & Fellner, D.W., (2010), "OpenCL vs. CUDA for Ray Tracing", XII Symposium on Virtual and Augmented Reality, pp.4, Everton Cavalcante, Brazil.
[Abstract] [BibTeX] [PDF] |
| Abstract: For many years the Graphics Processing Unit (GPU) of common desktops was just used to accelerate certain parts of the graphics pipeline. After developers had access to the native instruction set and memory of the massive parallel computational elements of GPUs a lot has changed. GPUs became powerful and programmable. Nowadays two SDKs are most used for GPU programming: CUDA and OpenCL. CUDA is the most adopted general purpose parallel computing architecture for GPUs but is restricted to Nvidia graphic cards only. In contrast, OpenCL is a new royalityfree framework for parallel programming intended to be portable across different hardware manufacturers or even different platforms. In this paper, we evaluate both solutions considering a typical parallel algorithm: Ray Tracing. We show our performance results and experiences on developing both implementations that could be easily adapted to solve other problems. |
BibTeX:
@inproceedings{Huff*10svr,
author = {Huff, Rafael and Neves, Tiago and Gierlinger, Thomas and Kuijper, Arjan and Stork, André and Fellner, Dieter W.},
title = {OpenCL vs. CUDA for Ray Tracing},
booktitle = {XII Symposium on Virtual and Augmented Reality},
publisher = {Everton Cavalcante, Brazil},
year = {2010},
pages = {4}
}
|
| Ioannides, M., Fellner, D.W., Georgopoulos, A. & Hadjimitsis, D.G. (ed.) (2010), "Digital Heritage. Third International Conference (EuroMed 2010)", Springer, Berlin, Heidelberg, New York. |
BibTeX:
@proceedings{Ioannides*10euromed,,
editor = {Ioannides, Marinos and Fellner, Dieter W. and Georgopoulos, Andreas and Hadjimitsis, Diofantos G.},
title = {Digital Heritage. Third International Conference (EuroMed 2010)},
publisher = {Springer, Berlin, Heidelberg, New York},
year = {2010},
doi = {http://dx.doi.org/10.1007/978-3-642-16873-4}
}
|
| Ioannides, M., Fellner, D.W., Georgopoulos, A. & Hadjimitsis, D.G. (ed.) (2010), "Digital Heritage", Vol.6436, Springer. |
BibTeX:
@proceedings{Ioannides*10lncs,,
editor = {Marinos Ioannides and Dieter W. Fellner and Andreas Georgopoulos and Diofantos G. Hadjimitsis},
title = {Digital Heritage},
publisher = {Springer},
year = {2010},
volume = {6436}
}
|
| Jung, Y., Webel, S., Olbrich, M., Drevensek, T., Franke, T., Roth, M. & Fellner, D.W., (2010), "Interactive Textures as Spatial User Interfaces in X3D", Proceedings Web3D 2010, pp.147-150.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: 3D applications, e.g. in the context of visualization or interactive design review, can require complex user interaction to manipulate certain elements, a typical task which requires standard user interface elements. However, there are still no generalized methods for selecting and manipulating objects in 3D scenes and 3D GUI elements often fail to gather support for reasons of simplicity, leaving developers encumbered to replicate interactive elements themselves. Therefore, we present a set of nodes that introduce different kinds of 2D user interfaces to X3D. We define a base type for these user interfaces called 'InteractiveTexture', which is a 2D texture node implementing slots for input forwarding. From this node we derive several user interface representations to enable complex user interaction suitable for both, desktop and immersive interaction. |
BibTeX:
@inproceedings{Jung*10web3d,
author = {Jung, Yvonne and Webel, Sabine and Olbrich, Manuel and Drevensek, Timm and Franke, Tobias and Roth, Marcus and Fellner, Dieter W.},
title = {Interactive Textures as Spatial User Interfaces in X3D},
booktitle = {Proceedings Web3D 2010},
year = {2010},
pages = {147-150},
doi = {http://dx.doi.org/10.1145/1836049.1836071}
}
|
| Jung, Y., Wagner, S., Jung, C., Behr, J. & Fellner, D.W., (2010), "Storyboarding and Pre-Visualization with X3D", Proceedings Web3D 2010, pp.73-81.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: This paper presents methods based on the open standard X3D to rapidly describe life-like characters and other scene elements in the context of storyboarding and pre-visualization. Current frameworks that employ virtual agents often rely on non-standardized pipelines and lack functionality to describe lighting, camera staging or character behavior in a descriptive and simple manner. Even though demand for such a system is high, ranging from edutainment to pre-visualization in the movie industry, few such systems exist. Thereto, we present the ANSWER framework, which provides a set of interconnected components that aid a film director in the process of film production from the planning stage to post-production. Rich and intuitive user interfaces are used for scene authoring and the underlying knowledge model is populated using semantic web technologies over which reasoning is applied. This transforms the user input into animated pre-visualizations that enable a director to experience and understand certain film making decisions before production begins. In this context we also propose some extensions to the current X3D standard for describing cinematic contents. |
BibTeX:
@inproceedings{Jung*10web3d-2,
author = {Jung, Yvonne and Wagner, Sebastian and Jung, Christoph and Behr, Johannes and Fellner, Dieter W.},
title = {Storyboarding and Pre-Visualization with X3D},
booktitle = {Proceedings Web3D 2010},
year = {2010},
pages = {73-81},
doi = {http://dx.doi.org/10.1145/1836049.1836060}
}
|
| Kahn, S., Wuest, H., Stricker, D. & Fellner, D.W., (2010), "3D Discrepancy Check via Augmented Reality", 9th IEEE International Symposium on Mixed and Augmented Reality 2010, pp.241-242, IEEE Computer Society, Los Alamitos, Calif..
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: For many tasks like markerless model-based camera tracking it is essential that the 3D model of a scene accurately represents the real geometry of the scene. It is therefore very important to detect deviations between a 3D model and a scene. We present an innovative approach which is based on the insight that camera tracking can not only be used for Augmented Reality visualization but also to solve the correspondence problem between 3D measurements of a real scene and their corresponding positions in the 3D model. We combine a time-of-flight camera (which acquires depth images in real time) with a custom 2D camera (used for the camera tracking) and developed an analysis-by-synthesis approach to detect deviations between a scene and a 3D model of the scene. |
BibTeX:
@inproceedings{Kahn*10ismar,
author = {Kahn, Svenja and Wuest, Harald and Stricker, Didier and Fellner, Dieter W.},
title = {3D Discrepancy Check via Augmented Reality},
booktitle = {9th IEEE International Symposium on Mixed and Augmented Reality 2010},
publisher = {IEEE Computer Society, Los Alamitos, Calif.},
year = {2010},
pages = {241-242},
doi = {http://dx.doi.org/10.1109/ISMAR.2010.5643587}
}
|
| Kahn, S., Wuest, H. & Fellner, D., (2010), "Time-of-Flight Based Scene Reconstruction with a Mesh Processing Tool for Model Based Camera Tracking", Proceedings VISIGRAPP 2010; International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications, pp.302-309, INSTICC Press, 2010.
[Abstract] [BibTeX] [PDF] |
| Abstract: The most challenging algorithmical task for markerless Augmented Reality applications is the robust estimation of the camera pose. With a given 3D model of a scene the camera pose can be estimated via model-based camera tracking without the need to manipulate the scene with fiducial markers. Up to now, the bottleneck of model-based camera tracking is the availability of such a 3D model. Recently time-of-flight cameras were developed which acquire depth images in real time. With a sensor fusion approach combining the color data of a 2D color camera and the 3D measurements of a time-of-flight camera we acquire a textured 3D model of a scene. We propose a semi-manual reconstruction step in which the alignment of several submeshes with a mesh processing tool is supervised by the user to ensure a correct alignment. The evaluation of our approach shows its applicability for reconstructing a 3D model which is suitable for model-based camera tracking even for objects which are difficultto measure reliably with a time-of-flight camera due to their demanding surface characteristics. |
BibTeX:
@inproceedings{Kahn*10visapp,
author = {S. Kahn and H. Wuest and D. Fellner},
title = {Time-of-Flight Based Scene Reconstruction with a Mesh Processing Tool for Model Based Camera Tracking},
booktitle = {Proceedings VISIGRAPP 2010; International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications},
publisher = {INSTICC Press, 2010},
year = {2010},
pages = {302-309}
}
|
| Krispel, U., Havemann, S. & Fellner, D.W., (2010), "FaMoS -- A visual editor for hierachical volumetric modeling", Tagungsband 05. Kongress Multimediatechnik Wismar, pp.1-6.
[Abstract] [BibTeX] [PDF] |
| Abstract: Shape grammar systems are the suitable method for modeling hierarchically structured 3D objects. A great variety of similar objects can be modeled using only a small set of rules. We present a prototypical graphical user interface for hierarchical volumetric modeling using the split grammar approach. Our focus is on creating split rules interactively rather than through scripting. Furthermore, we extend the concept of subdividing boxes to a more general representation and evaluate it in the context of generating 3D-facades of complex buildings. |
BibTeX:
@inproceedings{Krispel*10wismar,
author = {Krispel, Ulrich and Havemann, Sven and Fellner, Dieter W.},
title = {FaMoS -- A visual editor for hierachical volumetric modeling},
booktitle = {Tagungsband 05. Kongress Multimediatechnik Wismar},
year = {2010},
pages = {1-6}
}
|
| Landesberger, T., Kuijper, A., Schreck, T., Kohlhammer, J., van Wijk, J., Fekete, J.-D. & Fellner, D., Hauser, H. & Reinhard, E. (ed.) (2010), "Visual Analysis of Large Graphs", Eurographics 2010. State of the Art Reports (STARs), pp.113-136, Eurographics.
[Abstract] [BibTeX] [PDF] |
| Abstract: The analysis of large graphs plays a prominent role in various fields of research and is relevant in many important application areas. Effective visual analysis of graphs requires appropriate visual presentations in combination with respective user interaction facilities and algorithmic graph analysis methods. How to design appropriate graph analysis systems depends on many factors, including the type of graph describing the data, the analytical task at hand, and the applicability of graph analysis methods. The most recent surveys of graph visualization and navigation techniques were presented by Herman et al. [HMM00] and Diaz [DPS02]. The first work surveyed the main techniques for visualization of hierarchies and graphs in general that had been introduced until 2000. The second work concentrated on graph layouts introduced until 2002. Recently, new techniques have been developed covering a broader range of graph types, such as time-varying graphs. Also, in accordance with evergrowing amounts of graph-structured data becoming available, the inclusion of algorithmic graph analysis and interaction techniques becomes increasingly important. In this State-of-the-Art Report, we survey available techniques for the visual analysis of large graphs. Our review firstly considers graph visualization techniques according to the type of graphs supported. The visualization techniques form the basis for the presentation of interaction approaches suitable for visual graph exploration. As an important component of visual graph analysis, we discuss various graph algorithmic aspects useful for the different stages of the visual graph analysis process. |
BibTeX:
@inproceedings{Landesberger*10EG,
author = {T. Landesberger and A. Kuijper and T. Schreck and J. Kohlhammer and J. van Wijk and J.-D. Fekete and D. Fellner},
editor = {H. Hauser and E. Reinhard},
title = {Visual Analysis of Large Graphs},
booktitle = {Eurographics 2010. State of the Art Reports (STARs)},
publisher = {Eurographics},
year = {2010},
pages = {113-136}
}
|
| Nazemi, K., Breyer, M., Stab, C., Burkhardt, D. & Fellner, D., Chova, C.G., Belenguer, D.M. & Torres, I.C. (ed.) (2010), "Intelligent Exploration System -- an Approach for User-Centered Exploratoy Learning", Proc. International Conference on Education and New Learning Technologies [CD-ROM], pp.006476-006484, IATED.
[Abstract] [BibTeX] [PDF] |
| Abstract: The following paper describes the conceptual design of an Intelligent Exploration System (IES) that offers a user-adapted graphical environment of web-based knowledge repositories, to support and optimize the explorative learning. The paper starts with a short definition of learning by exploring and introduces the Intelligent Tutoring System and Semantic Technologies for developing such an Intelligent Exploration System. The IES itself will be described with a short overview of existing learner or user analysis methods, visualization techniques for exploring knowledge with semantics technology and the explanation of the characteristics of adaptation to offer a more efficient learning environment. |
BibTeX:
@inproceedings{Nazemi*10edulearn,
author = {K. Nazemi and M. Breyer and C. Stab and D. Burkhardt and D. Fellner},
editor = {C. Gomez Chova and D. Marti Belenguer and I. Candel Torres},
title = {Intelligent Exploration System -- an Approach for User-Centered Exploratoy Learning},
booktitle = {Proc. International Conference on Education and New Learning Technologies [CD-ROM]},
publisher = {IATED},
year = {2010},
pages = {006476-006484}
}
|
| Nazemi, K., Stab, C. & Fellner, D.W., (2010), "Interaction Analysis for Adaptive User Interfaces", Advanced Intelligent Computing Theories and Applications, pp.362-371.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Adaptive User Interfaces are able to facilitate the handling of computer systems through the automatic adaptation to users needs and preferences. For the realization of these systems, information about the individual user is needed. This user information can be extracted from user events by applying analytical methods without the active information input by the user. In this paper we introduce a reusable interaction analysis system based on probabilistic methods that predicts user interactions, recognizes user activities and detects user preferences on different levels of abstraction. The evaluation reveals that the prediction quality of the developed algorithm outperforms the quality of other established prediction methods. |
BibTeX:
@inproceedings{Nazemi*10icic,
author = {Nazemi, Kawa and Stab, Christian and Fellner, Dieter~W.},
title = {Interaction Analysis for Adaptive User Interfaces},
booktitle = {Advanced Intelligent Computing Theories and Applications},
year = {2010},
pages = {362-371},
doi = {http://dx.doi.org/10.1007/978-3-642-14922-1_45}
}
|
| Nazemi, K., Stab, C. & Fellner, D.W., (2010), "Interaction Analysis: An Algorithm for Interaction Prediction and Activity Recognition in Adaptive Systems", Proceedings IEEE International Conference on Intelligent Computing and Intelligent Systems, pp.607-612.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Predictive statistical models are used in the area of adaptive user interfaces to model user behavior and to infer user information from interaction events in an implicit and non-intrusive way. This information constitutes the basis for tailoring the user interface to the needs of the individual user. Consequently, the user analysis process should model the user with information, which can be used in various systems to recognize user activities, intentions and roles to accomplish an adequate adaptation to the given user and his current task. In this paper we present the improved prediction algorithm KO*/19, which is able to recognize, beside interaction predictions, behavioral patterns for recognizing user activities. By means of this extension, the evaluation shows that the KO*/19-Algorithm improves the Mean Prediction Rank more than 19% compared to other well-established prediction algorithms. |
BibTeX:
@inproceedings{Nazemi*10icis,
author = {Nazemi, Kawa and Stab, Christian and Fellner, Dieter W.},
title = {Interaction Analysis: An Algorithm for Interaction Prediction and Activity Recognition in Adaptive Systems},
booktitle = {Proceedings IEEE International Conference on Intelligent Computing and Intelligent Systems},
year = {2010},
pages = {607-612},
doi = {http://dx.doi.org/10.1109/ICICISYS.2010.5658514}
}
|
| Nazemi, K., Burkhardt, D., Breyer, M., Stab, C. & Fellner, D.W., (2010), "Semantic Visualization Cockpit: Adaptable Composition of Semantics-Visualization Techniques for Knowledge-Exploration", ICL 2010 Proceedings, International Conference Interactive Computer Aided Learning Academic and Corporate E-Learning in a Global Context, pp.163-173.
[Abstract] [BibTeX] [PDF] |
| Abstract: Semantic-Web and ontology-based information processing systems are established technologies and techniques, in more than only research areas and institutions. Different worldwide projects and enterprise companies identified already the added value of semantic technologies and work on different sub-topics for gathering and conveying knowledge. As the process of gathering and structuring semantic information plays a key role in the most developed applications, the process of transferring and adopting knowledge to and by humans is neglected, although the complex structure of knowledge-design opens many research-questions. The following paper describes a new approach for visualizing semantic information as a composition of different adaptable ontology-visualization techniques. We start with a categorized description of existing ontology visualization techniques and show potential gaps. After that the new approach will be described and its added value to existing systems. A case study within the greatest German program for semantic information processing will show the usage of the system in real scenarios. |
BibTeX:
@inproceedings{Nazemi*10icl,
author = {Nazemi, Kawa and Burkhardt, Dirk and Breyer, Matthias and Stab, Christian and Fellner, Dieter W.},
title = {Semantic Visualization Cockpit: Adaptable Composition of Semantics-Visualization Techniques for Knowledge-Exploration},
booktitle = {ICL 2010 Proceedings, International Conference Interactive Computer Aided Learning Academic and Corporate E-Learning in a Global Context},
year = {2010},
pages = {163-173}
}
|
| Nazemi, K., Breyer, M., Burkhardt, D. & Fellner, D.W., (2010), "Visualization Cockpit: Orchestration of Multiple Visualizations for Knowledge-Exploration", International Journal of Advanced Corporate Learning, Vol.3(4), pp.26-34.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Semantic-Web technologies and ontology-based information processing systems are established techniques, in more than only research areas and institutions. Different worldwide projects and enterprise companies identified already the added value of semantic technologies, so they work on different sub-topics for gathering and conveying knowledge. As the process of gathering and structuring semantic information plays a key role in the most developed applications, the process of transferring and adopting knowledge to and by humans is neglected, although the complex structure of knowledge-design opens many research-questions. The customization of the presentation itself and the interaction techniques with these presentation artifacts is a key question for gainful and effective work with semantic information. The following paper describes a new approach for visualizing semantic information as a composition of different adaptable ontology-visualization techniques. We start with a categorized description of existing ontology visualization techniques and show potential gaps. |
BibTeX:
@article{Nazemi*10jacl,
author = {Nazemi, Kawa and Breyer, Matthias and Burkhardt, Dirk and Fellner, Dieter W.},
title = {Visualization Cockpit: Orchestration of Multiple Visualizations for Knowledge-Exploration},
journal = {International Journal of Advanced Corporate Learning},
year = {2010},
volume = {3},
number = {4},
pages = {26-34},
doi = {http://dx.doi.org/10.3991/ijac.v3i4.1473}
}
|
| Pan, X., Beckmann, P., Havemann, S., Tzompanaki, K., Doerr, M. & Fellner, D.W., (2010), "A Distributed Object Repository for Cultural Heritage", VAST 2010, pp.105-114.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: This paper describes the design and the implementation of a distributed object repository that offers cultural heritage experts and practitioners a working platform to access, use, share and modify digital content. The principle of collecting paradata to document each step in a potentially long sequence of processing steps implies a number of design decisions for the data repository, which are described and explained. Furthermore, we provide a description of the concise API our implementation. Our intention is to provide an easy-to-understand recipe that may be valuable also for other data repository implementations that incorporate and operationalize the more theoretical concepts of intellectual transparency, collecting paradata, and compatibility to semantic networks. |
BibTeX:
@conference{Pan*10vast,
author = {Pan, Xueming and Beckmann, Philipp and Havemann, Sven and Tzompanaki, Katerina and Doerr, Martin and Fellner, Dieter W.},
title = {A Distributed Object Repository for Cultural Heritage},
booktitle = {VAST 2010},
year = {2010},
pages = {105-114},
doi = {http://dx.doi.org/10.2312/VAST/VAST10/105-114}
}
|
| Peña Serna, S., Stork, A. & Fellner, D.W., (2010), "Tetrahedral Mesh-Based Embodiment Design", ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, pp.10.
[Abstract] [BibTeX] [PDF] |
| Abstract: The engineering design is a systematic approach implemented in the product development process, which is composed of several phases and supported by different tools. Computer-Aided Design (CAD) and Computer-Aided Engineering (CAE) tools are particularly dedicated to the embodiment phase and these enable engineers to design and analyze a potential solution. Nonetheless, the lack of integration between CAD and CAE restricts the exploration of design variations. Hence, we aim at incorporating functionalities of a CAD system within a CAE environment, by means of building a high level representation of the mesh and allowing the engineer to handle and manipulate semantic features, avoiding the direct manipulation of single elements. Thus, the engineer will be able to perform extruding, rounding or dragging operations regardless of geometrical and topological limitations. We present in this paper, the intelligence that a simulating mesh needs to support, in order to enable such operations. |
BibTeX:
@inproceedings{Pena*10asme,
author = {Peña Serna, Sebastian and Stork, André and Fellner, Dieter W.},
title = {Tetrahedral Mesh-Based Embodiment Design},
booktitle = {ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conference},
year = {2010},
pages = {10}
}
|
| Peña Serna, S., Stork, A. & Fellner, D.W., (2010), "Embodiment Mesh Processing", Research in Interactive Design. Volume 3, pp.6, Springer, Paris, Berlin, Heidelberg.
[Abstract] [BibTeX] [PDF] |
| Abstract: During the last two decades, several approaches have been proposed, in order to deal with the integration in the embodiment phase of the engineering design. This phase deals with the virtual product development and it is supported by Computer-Aided Design (CAD) and Computer-Aided Engineering (CAE). Nonetheless, this integration has not really been achieved. There is a well established communication from design to analysis, but there is a lack of design operations and functionalities within an analysis environment. This lack of integration will always be presented as long as there are used different representation schemes for design and analysis. Hence, Embodiment Mesh Processing (EMP) is based on a common mesh representation and it aims to provide mesh-based modeling functionalities within an analysis environment. We present our reasoning behind EMP and the needed building blocks for enabling a fully integrated design-analysis interaction loop and the exploration of design variations. |
BibTeX:
@inproceedings{Pena*10idmme,
author = {Peña Serna, Sebastian and Stork, André and Fellner, Dieter W.},
title = {Embodiment Mesh Processing},
booktitle = {Research in Interactive Design. Volume 3},
publisher = {Springer, Paris, Berlin, Heidelberg},
year = {2010},
pages = {6}
}
|
| Schiefer, A., Berndt, R., Settgast, V., Ullrich, T. & Fellner, D.W., (2010), "Service-oriented scene graph manipulation", Proceedings Web3D 2010, Proceedings of the 15th International Conference on Web 3D Technology, pp.55-62.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: In this paper we present a software architecture for the integration of a RESTful web service interface in OpenSG applications. The proposed architecture can be integrated into any OpenSG application with minimal changes to the sources. Extending a scene graph application with a web service interface offers many new possibilities. Without much effort it is possible to review and control the scene and its components using a web browser. New ways of (browser based) user interactions can be added on all kinds of web enabled devices. As an example we present the integration of 'SweetHome3D' into an existing virtual reality setup. |
BibTeX:
@inproceedings{Schiefer*10web3d,
author = {Andreas Schiefer and René Berndt and Volker Settgast and Torsten Ullrich and Dieter W.~Fellner},
title = {Service-oriented scene graph manipulation},
booktitle = {Proceedings Web3D 2010, Proceedings of the 15th International Conference on Web 3D Technology},
year = {2010},
pages = {55--62},
doi = {http://dx.doi.org/10.1145/1836049.1836057}
}
|
| Schiffer, T., Schiefer, A., Berndt, R., Ullrich, T., Settgast, V. & Fellner, D.W., (2010), "Enlightened by the Web -- A service-oriented architecture for real-time photorealistic rendering ", Tagungsband 05. Kongress Multimediatechnik Wismar, pp.1-8.
[BibTeX] [PDF] |
BibTeX:
@inproceedings{Schiffer*10wismar,
author = {Schiffer, Thomas and Schiefer, Andreas and Berndt, René and Ullrich, Torsten and Settgast, Volker and Fellner, Dieter W.},
title = {Enlightened by the Web -- A service-oriented architecture for real-time photorealistic rendering },
booktitle = {Tagungsband 05. Kongress Multimediatechnik Wismar},
year = {2010},
pages = {1-8}
}
|
| Schinko, C., Strobl, M., Ullrich, T. & Fellner, D.W., (2010), "Modeling Procedural Knowledge: A Generative Modeler for Cultural Heritage", Digital Heritage. Third International Conference, EuroMed 2010, pp.153-165.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Within the last few years generative modeling techniques have gained attention especially in the context of cultural heritage. As a generative model describes a rather ideal object than a real one, generative techniques are a basis for object description and classification. This procedural knowledge differs from other kinds of knowledge, such as declarative knowledge, in a significant way. It can be applied to a task. This similarity to algorithms is reflected in the way generative models are designed: they are programmed. In order to make generative modeling accessible to cultural heritage experts, we created a generative modeling framework which accounts for their special needs. The result is a generative modeler (http://www.cgv.tugraz.at/euclides) based on an easy-to-use scripting language (JavaScript). The generative model meets the demands on documentation standards and fulfils sustainability conditions. Its integrated meta-modeler approach makes it independent from hardware, software and platforms |
BibTeX:
@inproceedings{Schinko*10euromed,
author = {Schinko, Christoph and Strobl, Martin and Ullrich, Torsten and Fellner, Dieter W.},
title = {Modeling Procedural Knowledge: A Generative Modeler for Cultural Heritage},
booktitle = {Digital Heritage. Third International Conference, EuroMed 2010},
year = {2010},
pages = {153-165},
doi = {http://dx.doi.org/10.1007/978-3-642-16873-4_12}
}
|
| Schwenk, K., Franke, T., Drevensek, T., Kuijper, A., Bockholt, U. & Fellner, D., Lensch, H. & Seipel, S. (ed.) (2010), "Adapting Precomputed Radiance Transfer to Real-time Spectral Rendering", Eurographics 2010. Short Papers, pp.49-52, Eurographics.
[Abstract] [BibTeX] [PDF] |
| Abstract: Spectral rendering takes the full visible spectrum into account when calculating light-surface interaction and can overcome the well-known deficiencies of rendering with tristimulus color models. We present a variant of the precomputed radiance transfer algorithm that is tailored towards real-time spectral rendering on modern graphics hardware. Our method renders diffuse, self-shadowing objects with spatially varying spectral reflectance properties under distant, dynamic, full-spectral illumination. To achieve real-time frame rates and practical memory requirements we split the light transfer function into an achromatic part that varies per vertex and a wavelength-dependent part that represents a spectral albedo texture map. As an additional optimization, we project reflectance and illuminant spectra into an orthonormal basis. One area of application for our research is virtual design applications that require relighting objects with high color fidelity at interactive framerates. |
BibTeX:
@inproceedings{Schwenk*10EG,
author = {K. Schwenk and T. Franke and T. Drevensek and A. Kuijper and U. Bockholt and D. Fellner},
editor = {H. Lensch and S. Seipel},
title = {Adapting Precomputed Radiance Transfer to Real-time Spectral Rendering},
booktitle = {Eurographics 2010. Short Papers},
publisher = {Eurographics},
year = {2010},
pages = {49-52}
}
|
| Schwenk, K., Jung, Y., Behr, J. & Fellner, D.W., (2010), "A Modern Declarative Surface Shader for X3D", Proceedings Web3D 2010, pp.7-15.
[Abstract] [BibTeX] [PDF] |
| Abstract: This paper introduces a modern, declarative surface shader for the X3D standard that allows for a compact, expressive, and implementation-independent specification of surface appearance. X3D's Material node is portable, but its feature set has become inadequate over the last years. Explicit shader programs, on the other hand, offer the expressive power to specify advanced shading techniques, but are highly implementation-dependent. The motivation for our proposal is to bridge the gap between these two worlds -- to provide X3D with renderer-independent support for modern materials and to increase interoperability with DCC tools. At the core of our proposal is the CommonSurfaceShader node. This node provides no explicit shader code, only a slim declarative interface consisting of a set of parameters with clearly defined semantics. Implementation details are completely hidden and portability is maximized. It supports diffuse and glossy surface reflection, bump mapping, and perfect specular reflection and refraction. This feature set can capture the appearance of many common materials accurately and is easily mappable to the material descriptions of other software packages and file formats. To verify our claims, we have implemented and analyzed the proposed node in three different rendering pipelines: a renderer based on hardware accelerated rasterization, an interactive ray tracer, and a path tracer. |
BibTeX:
@inproceedings{Schwenk*10web3d,
author = {Schwenk, Karsten and Jung, Yvonne and Behr, Johannes and Fellner, Dieter W.},
title = {A Modern Declarative Surface Shader for X3D},
booktitle = {Proceedings Web3D 2010},
year = {2010},
pages = {7-15},
note = {10.1145/1836049.1836051}
}
|
| Stab, C., Breyer, M., Nazemi, K., Burkhardt, D., Hofmann, C. & Fellner, D., (2010), "SemaSun: Visualization of Semantic Knowledge Based on an Improved Sunburst Visualization Metaphor", Proceedings of ED-Media 2010; World Conference on Educational Multimedia, Hypermedia & Telecommunications [online], pp.911-919, AACE. |
| Abstract: Ontologies have become an established data model for conceptualizing knowledge entities and describing semantic relationships between them. They are used to model the concepts of specific domains and are widespread in the areas of the semantic web, digital libraries and multimedia database management. To gain the most possible benefit from this data model, it is important to offer adequate visualizations, so that users can easily acquire the knowledge. Most ontology visualization techniques are based on hierarchical or graph-based visualization metaphors. This may result in information-loss, visual clutter, cognitive overload or context-loss. In this paper we describe a new approach of ontology visualization technique called SemaSun that is based on the sunburst visualization metaphor. We improved this metaphor, which is naturally designed for displaying hierarchical data, to the tasks of displaying multiple inheritance and semantic relations. This approach also offersincremental ontology exploring to reduce the cognitive load without losing the informational context. |
BibTeX:
@inproceedings{Stab*10edmedia,
author = {C. Stab and M. Breyer and K. Nazemi and D. Burkhardt and C. Hofmann and D. Fellner},
title = {SemaSun: Visualization of Semantic Knowledge Based on an Improved Sunburst Visualization Metaphor},
booktitle = {Proceedings of ED-Media 2010; World Conference on Educational Multimedia, Hypermedia & Telecommunications [online]},
publisher = {AACE},
year = {2010},
pages = {911-919}
}
|
| Stab, C., Nazemi, K. & Fellner, D.W., (2010), "SemaTime - Timeline Visualization of Time-Dependent Relations and Semantics", Advances in Visual Computing. 6th International Symposium, ISVC 2010, pp.514-523, Springer, Berlin, Heidelberg, New York.
[Abstract] [BibTeX] [PDF] |
| Abstract: Timeline based visualizations arrange time-dependent entities along a time-axis and are used in many different domains like digital libraries, criminal investigation and medical information systems to support users in understanding chronological structures. By the use of semantic technologies, the information is categorized in a domain-specific, hierarchical schema and specified by semantic relations. Commonly semantic relations in timeline visualizations are depicted by interconnecting entities with a directed edge. However it is possible that semantic relations change in the course of time. In this paper we introduce a new timeline visualization for time-dependent semantics called SemaTime that offers a hierarchical categorization of time-dependent entities including navigation and filtering features. We also present a novel concept for visualizing time-dependent relations that allows the illustration of time-varying semantic relations and affords an easy understandable visualization of complex, time-dependent interrelations. |
BibTeX:
@inproceedings{Stab*10lncs,
author = {Stab, Christian and Nazemi, Kawa and Fellner, Dieter W.},
title = {SemaTime - Timeline Visualization of Time-Dependent Relations and Semantics},
booktitle = {Advances in Visual Computing. 6th International Symposium, ISVC 2010},
publisher = {Springer, Berlin, Heidelberg, New York},
year = {2010},
pages = {514-523}
}
|
| Strobl, M., Schinko, C. & Torsten, U., (2010), "Euclides -- A JavaScript to PostScript Translator", Proceedings of the International Conference on Computational Logics, Algebras, Programming, Tools, and Benchmarking (Computation Tools), pp.14-21.
[Abstract] [BibTeX] [PDF] |
| Abstract: Offering an easy access to programming languages that are difficult to approach directly dramatically reduces the inhibition threshold. The Generative Modeling Language is such a language and can be described as being similar to Adobe's PostScript. A major drawback of all PostScript dialects is their unintuitive reverse Polish notation, which makes both -- reading and writing -- a cumbersome task. A language should offer a structured and intuitive syntax in order to increase efficiency and avoid frustration during the creation of code. To overcome this issue, we present a new approach to translate JavaScript code to GML automatically. While this translation is basically a simple infix-to-postfix notation rewrite for mathematical expressions, the correct translation of control flow structures is a non-trivial task, due to the fact that there is no concept of 'goto' in the PostScript language and its dialects. The main contribution of this work is the complete translation of JavaScript into a PostScript dialect including all control flow statements. To the best of our knowledge, this is the first complete translator. |
BibTeX:
@inproceedings{Strobl*10ct,
author = {Strobl, Martin and Schinko, Christoph and Torsten, Ullrich},
title = {Euclides -- A JavaScript to PostScript Translator},
booktitle = {Proceedings of the International Conference on Computational Logics, Algebras, Programming, Tools, and Benchmarking (Computation Tools)},
year = {2010},
pages = {14-21}
}
|
| Ullrich, T., Settgast, V. & Berndt, R., (2010), "Semantic Enrichment for 3D Documents Techniques and Open Problems", ELPUB 2010 - Publishing in the networked world: transforming the nature of communication, pp.79-88.
[BibTeX] [PDF] |
BibTeX:
@inproceedings{Ullrich*10elpub,
author = {T. Ullrich and V. Settgast and R. Berndt},
title = {Semantic Enrichment for 3D Documents Techniques and Open Problems},
booktitle = {ELPUB 2010 - Publishing in the networked world: transforming the nature of communication},
year = {2010},
pages = {79-88}
}
|
| Ullrich, T., Schiefer, A. & Fellner, D.W., (2010), "Modeling with Subdivision Surfaces", Proceeding of the 18th WSCG International Conference on Computer Graphics, Visualization and Computer Vision, pp.1-8.
[BibTeX] [PDF] |
BibTeX:
@article{Ullrich*10wscg,
author = {Ullrich, Torsten and Schiefer, Andreas and Fellner, Dieter W.},
title = {Modeling with Subdivision Surfaces},
journal = {Proceeding of the 18th WSCG International Conference on Computer Graphics, Visualization and Computer Vision},
year = {2010},
pages = {1-8}
}
|
| Ullrich, T., Schinko, C. & Fellner, D.W., Skala, V. (ed.) (2010), "Procedural Modeling in Theory and Practice", Proceeding of the 18th WSCG International Conference on Computer Graphics, Visualization and Computer Vision, pp.5-8.
[Abstract] [BibTeX] [PDF] |
| Abstract: Procedural modeling is a technique to describe 3D objects by a constructive, generative description. In order to tap the full potential of this technique the content creator needs to be familiar with two worlds -- procedural modeling techniques and computer graphics on the one hand as well as domain-specific expertise and specialized knowledge on the other hand. This article presents a JavaScript-based approach to combine both worlds. It describes a modeling tool for generative modeling whose target audience consists of beginners and intermediate learners of procedural modeling techniques. Our approach will be beneficial in various contexts. JavaScript is a wide-spread, easy-to-use language. With our tool procedural models can be translated from JavaScript to various generative modeling and rendering systems. |
BibTeX:
@article{Ullrich*10wscg2,
author = {Ullrich, Torsten and Schinko, Christoph and Fellner, Dieter W.},
editor = {Vaclav Skala},
title = {Procedural Modeling in Theory and Practice},
journal = {Proceeding of the 18th WSCG International Conference on Computer Graphics, Visualization and Computer Vision},
year = {2010},
pages = {5-8}
}
|
| Wendt, L., Stork, A., Kuijper, A. & Fellner, D., (2010), "3D Reconstruction from Line Drawings", Proceedings VISIGRAPP 2010; International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications, pp.65-71, INSTICC Press.
[Abstract] [BibTeX] [PDF] |
| Abstract: In this work we introduce an approach for reconstructing digital 3D models from multiple perspective line drawings. One major goal is to keep the required user interaction simple and at a minimum, while making no constraints to the objects shape. Such a system provides a useful extension for digitalization of paper-based styling concepts, which today is still a time consuming process. In the presented method the line drawings are first decomposed in curves assembling a network of curves. In a second step, the positions for the endpoints of the curves are determined in 3D, using multiple sketches and a virtual camera model given by the user. Then the shapes of the 3D curves between the reconstructed 3D endpoints are inferred. This leads to a network of 3D curves, which can be used for first visual evaluations in 3D. During the whole process only little user interaction is needed, which only takes place in the pre- and post-processing phases. The approach has beenapplied on multiple sketches and it is shown that the approach creates plausible results within reasonable timing. |
BibTeX:
@inproceedings{Wendt*10visapp,
author = {L. Wendt and A. Stork and A. Kuijper and D. Fellner},
title = {3D Reconstruction from Line Drawings},
booktitle = {Proceedings VISIGRAPP 2010; International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications},
publisher = {INSTICC Press},
year = {2010},
pages = {65-71}
}
|
| Zmugg, R., Havemann, S. & Fellner, D.W., (2010), "Towards a Voting Scheme for Calculating Light Source Positions from a given Target Illumination", Eurographics Italian Chapter Conference (EG-IT 2010), pp.41-48.
[Abstract] [BibTeX] [PDF] |
| Abstract: Lighting conditions can make the difference between success or failure of an architectural space. The vision of space-light co-design is that architects can control the impression of an illuminated space already at an early design stage, instead of first designing spaces and then searching for a good lighting setup. As a first step towards this vision we propose a novel method to calculate potential light source positions from a given user defined target illumination. The method is independent of the tessellation of the scene and assumes a homogeneous diffuse Lambertian material. This allows using a voting system that determines potential positions for standard light sources with chosen size and brightness. Votes are cast from an illuminated surface point to all potential positions of a light source that would yield this illumination. Vote clusters consequently indicate a more probable light source position. With a slight extension the method can also identify mid-air light source positions. |
BibTeX:
@inproceedings{Zmugg*10egit,
author = {Zmugg, René and Havemann, Sven and Fellner, Dieter W.},
title = {Towards a Voting Scheme for Calculating Light Source Positions from a given Target Illumination},
booktitle = {Eurographics Italian Chapter Conference (EG-IT 2010)},
year = {2010},
pages = {41-48}
}
|
2009 |
| Augsdörfer, U.H., Dodgson, N.A. & Sabin, M.A., (2009), "Removing polar rendering artifacts in subdivision surfaces ", Journal of Graphics, GPU, & Game Tools, Vol.14(2), pp.61-76.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: A polar artifact occurs in subdivision surfaces around high valency vertices. It manifests as large polygons in an otherwise finely subdivided mesh. It is particularly noticeable in subdivision schemes that have been tuned to improve the appearance and behaviors of the limit surface. Using the bounded curvature Catmull-Clark scheme as an example, we describe three practical methods by which this rendering artifact can be removed, thereby allowing us to benefit from the improved character of such tuned schemes. |
BibTeX:
@article{Augsdoerfer*09jgt,
author = {Ursula H. Augsdörfer and Neil A. Dodgson and Malcolm A. Sabin},
title = {Removing polar rendering artifacts in subdivision surfaces },
journal = {Journal of Graphics, GPU, & Game Tools},
year = {2009},
volume = {14},
number = {2},
pages = {61-76},
doi = {http://dx.doi.org/10.1080/2151237X.2009.10129278}
}
|
| Augsdörfer, U.H., Cashman, T.J., Dodgson, N.A. & Sabin, M.A., (2009), "Numerical checking of C1 for arbitrary degree subdivision schemes", Mathematics of Surfaces XIII, Vol.5654, pp.45-54, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We derive a numerical method to confirm that a subdivision scheme based on quadrilateral meshes is C1 at the extraordinary points. We base our work on Theorem 5.25 in Peters and Reif's book 'Subdivision Surfaces', which expresses it as a condition on the derivatives within the characteristic ring around the EV. This note identifies instead a sufficient condition on the control points in the natural configuration from which the conditions of Theorem 5.25 can be established. |
BibTeX:
@inproceedings{Augsdoerfer*09lncs,
author = {Ursula H. Augsdörfer and Thomas J. Cashman and Neil A. Dodgson and Malcolm A. Sabin},
title = {Numerical checking of C1 for arbitrary degree subdivision schemes},
booktitle = {Mathematics of Surfaces XIII},
publisher = {Springer},
year = {2009},
volume = {5654},
pages = {45-54},
doi = {http://dx.doi.org/10.1007/978-3-642-03596-8_3}
}
|
| Bein, M., Havemann, S., Stork, A. & Fellner, D.W., Grimm, C. & LaViola, J. (ed.) (2009), "Sketching Subdivision Surfaces", Proc. 6th Eurographics Symposium on Sketch-Based Interfaces and Modeling 2009, pp.61-68, ACM SIGGRAPH.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We describe a 3D modeling system that combines subdivision surfaces with sketch-based modeling in order to meet two conflicting goals: ease of use and fine-grained shape control. For the excellent control, low-poly modeling is still the method of choice for creating high-quality 3D models, e.g., in the games industry. However, direct mesh editing can be very tedious and time consuming. Our idea is to include also stroke-based techniques for rapidly modeling regular surface parts. We propose a simple and efficient algorithm for converting a 2D stroke to a control polygon suitable for Catmull/Clark subdivision surfaces. We have realized a small but reasonably rich set of interactive modeling tools to assess the expressiveness of stroke-based mesh design with a number of examples. |
BibTeX:
@inproceedings{Bein*09sbim,
author = {M. Bein and S. Havemann and A. Stork and D.~W. Fellner},
editor = {C. Grimm and J. LaViola},
title = {Sketching Subdivision Surfaces},
booktitle = {Proc. 6th Eurographics Symposium on Sketch-Based Interfaces and Modeling 2009},
publisher = {ACM SIGGRAPH},
year = {2009},
pages = {61--68},
doi = {http://dx.doi.org/10.1145/1572741.1572753}
}
|
| Berndt, R., Blümel, I., Krottmaier, H., Wessel, R. & Schreck, T., (2009), "Demonstration of User Interfaces for Querying in 3D Architectural Content in PROBADO 3D", Research and Advanced Technology for Digital Libraries, pp.491-492. |
| Abstract: The PROBADO project is a research effort to develop Digital Library support for non-textual documents. The main goal is to contribute to all parts of the Digital Library workflow from content acquisition over semi-automatic indexing to search and presentation. PROBADO3D is a part of the PROBADO framework designed to support 3D documents, with a focus on the Architectural domain. This demonstration will present a set of specialized user interfaces that were developed for content-based querying in this document domain. |
BibTeX:
@inproceedings{Berndt*09,
author = {Berndt, Rene and Blümel, Ina and Krottmaier, Harald and Wessel, Raoul and Schreck, Tobias},
title = {Demonstration of User Interfaces for Querying in 3D Architectural Content in PROBADO 3D},
booktitle = {Research and Advanced Technology for Digital Libraries},
year = {2009},
pages = {491-492}
}
|
| Berndt, R., Krottmaier, H., Havemann, S. & Schreck, T., (2009), "The PROBADO-Framework: Content-based Queries for Non-textual Documents", ELPUB 2009: 13th International Conference on Electronic Publishing, pp.17. |
| Abstract: In this paper we describe the system architecture of PROBADO, a project funded by the German Research Foundation (DFG). Its main goal is to provide a general library infrastructure for dealing with non-textual documents, in particular for content-based searching. PROBADO provides an infrastructure that allows integrating existing data repositories and content-based search engines into one common framework. The system architecture has three layers interconnected by a service-oriented architecture (SOA) currently using SOAP 1.1 as the communication protocol. The layers are: [1] a front-end layer, responsible for providing the user interface [2], a core layer, responsible for scheduling requests from the interface to different repositories, and [3] a repository wrapper layer, responsible for enabling existing repositories and search engines to interface to the system. The functionality of each layer is described in detail. The general architecture is complemented by a brief introduction to the domain-dependent functionality currently provided. |
BibTeX:
@inproceedings{Berndt*09elpub,
author = {Berndt, Rene and Krottmaier, Harald and Havemann, Sven and Schreck, Tobias},
title = {The PROBADO-Framework: Content-based Queries for Non-textual Documents},
booktitle = {ELPUB 2009: 13th International Conference on Electronic Publishing},
year = {2009},
pages = {17}
}
|
| Berndt, R., Havemann, S. & Fellner, D.W., Spencer, S.N. (ed.) (2009), "3D Modeling in a Web Browser to Formulate Content-Based 3D Queries", Proceedings of the 14th International Conference on 3D Web Technology (Web3D 2009), pp.111-118, ACM Press.
[Abstract] [BibTeX] [PDF] |
| Abstract: We present a framework for formulating domain-dependent 3D search queries suitable for content-based 3D search over the web. Users are typically not willing to spend much time to create a 3D query object. They expect to quickly see a result set in which they can navigate by further differentiating the query object. Our system innovates by using a streamlined parametric 3D modeling engine on both client and server side. Parametric tools have greater expressiveness, they allow shape manipulation through a few highlevel parameters, as well as incremental assembly of query objects. Short command strings are sent from client to server to keep the query objects on both sides in sync. This reduces turnaround times and allows asynchronous updates of live result sets. |
BibTeX:
@inproceedings{Berndt*09web3d,
author = {Rene Berndt and Sven Havemann and Dieter W.~Fellner},
editor = {Stephen N. Spencer},
title = {3D Modeling in a Web Browser to Formulate Content-Based 3D Queries},
booktitle = {Proceedings of the 14th International Conference on 3D Web Technology (Web3D 2009)},
publisher = {ACM Press},
year = {2009},
pages = {111--118}
}
|
| Blümel, I., Diet, Jü. & Krottmaier, H., (2009), "Integrating Multimedia Repositories into the PROBADO Framework", Proc. Intern. Conference on Ditital Information Management (ICDIM 2008), pp.178-183.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: In this paper, we describe a digital library initiative for non-textual documents. The proposed framework will integrate different types of content-repositories -- each one specialized for a specific multimedia domain -- into one seamless system and will add features such as automatic annotation, full-text retrieval and recommender services to non-textual documents. Two multimedia domains, 3D graphics and music, will be introduced. The repositories can be searched using both textual (metadata-based) and non-textual retrieval mechanisms (e.g. using a complex sketch-based interface for searching in 3D-models or a query-by-humming interface for music). Domain-specific metadata models are developed and workflows for automated content-based data analysis and indexing proposed. |
BibTeX:
@inproceedings{Bluemel*08,
author = {Ina Blümel and Jürgen Diet and Harald Krottmaier},
title = {Integrating Multimedia Repositories into the PROBADO Framework},
booktitle = {Proc. Intern. Conference on Ditital Information Management (ICDIM 2008)},
year = {2009},
pages = {178--183},
doi = {http://dx.doi.org/10.1109/ICDIM.2008.4746720}
}
|
| Cashman, T.J., Augsdörfer, U.H. & Sabin, M.A., (2009), "NURBS with extraordinary points: high-degree non-uniform subdivision surfaces", ACM Transactions on Graphics, Vol.28(3), pp.Article 46.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present a subdivision framework that adds extraordinary vertices to NURBS of arbitrarily high degree. The surfaces can represent any odd degree NURBS patch exactly. Our rules handle non-uniform knot vectors, and are not restricted to midpoint knot insertion. In the absence of multiple knots at extraordinary points, the limit surfaces have bounded curvature. |
BibTeX:
@article{Cashman*09TOG,
author = {Thomas J. Cashman and Ursula H. Augsdörfer and Malcolm A. Sabin},
title = {NURBS with extraordinary points: high-degree non-uniform subdivision surfaces},
journal = {ACM Transactions on Graphics},
year = {2009},
volume = {28},
number = {3},
pages = {Article 46},
doi = {http://dx.doi.org/10.1145/1576246.1531352}
}
|
| Dodgson, N.A., Augsdörfer, U.H., Cashman, T.J. & Sabin, M.A., (2009), "Deriving Box-Spline Subdivision Schemes", Mathematics of Surfaces XIII, Vol.5654, pp.106-123, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We describe and demonstrate an arrow notation for deriving box-spline subdivision schemes. We compare it with the z-transform, matrix, and mask convolution methods of deriving the same. We show how the arrow method provides a useful graphical alternative to the three numerical methods. We demonstrate the properties that can be derived easily using the arrow method: mask, stencils, continuity in regular regions, safe extrusion directions. We derive all of the symmetric quadrilateral binary box-spline subdivision schemes with up to eight arrows and all of the symmetric triangular binary box-spline subdivision schemes with up to six arrows. We explain how the arrow notation can be extended to handle ternary schemes. We introduce two new binary dual quadrilateral box-spline schemes and one new $$ box-spline scheme. With appropriate extensions to handle extraordinary cases, these could each form the basis for a new subdivision scheme. |
BibTeX:
@inproceedings{Dodgson*09lncs,
author = { Neil A. Dodgson and Ursula H. Augsdörfer and Thomas J. Cashman and Malcolm A. Sabin},
title = {Deriving Box-Spline Subdivision Schemes},
booktitle = {Mathematics of Surfaces XIII},
publisher = {Springer},
year = {2009},
volume = {5654},
pages = {106-123},
doi = {http://dx.doi.org/10.1007/978-3-642-03596-8_7}
}
|
| Encarna ao, J.L., Fellner, D.W. & Schaub, J. (ed.) (2009), "Selected Readings in Computer Graphics 2008", Fraunhofer Verlag, Stuttgart. |
BibTeX:
@book{Encarnacao*09sr,,
editor = {Encarnaão, José L. and Fellner, Dieter W. and Schaub, Jutta},
title = {Selected Readings in Computer Graphics 2008},
publisher = {Fraunhofer Verlag, Stuttgart},
year = {2009}
}
|
| Fellner, D.W., Baier, K., Wehner, D. & Toll, A. (ed.) (2009), "Jahresbericht 2008 : Fraunhofer-Institut für Graphische Datenverarbeitung IGD", Fraunhofer-Institut für Graphische Datenverarbeitung (IGD). |
BibTeX:
@book{Fellner*08igd,,
editor = {Fellner, Dieter W. and Baier, Konrad and Wehner, Detlef and Toll, Andrea},
title = {Jahresbericht 2008 : Fraunhofer-Institut für Graphische Datenverarbeitung IGD},
publisher = {Fraunhofer-Institut für Graphische Datenverarbeitung (IGD)},
year = {2009}
}
|
| Fellner, D.W., Müller-Wittig, W. & Unbescheiden, M., (2009), "Virtual and augmented reality", Technology guide: Principles, Applications, Trends, pp.250-255, Springer. |
| Abstract: The rapid development of microprocessors and graphics processing units (GPUs) has had an impact on information and communication technologies (lCT) over recent years. "Shaders" offer real-time visualisation of complex, computer-generated 3D models with photorealistic quality. Shader technology includes hardware and software modules which colour virtual 3D objects and model reflective properties. These developments have laid the foundations for mixed reality systems which enable both immersion into and realtime interaction with the environment. These environments are based on Milgram's mixed reality continuum where reality is a gradated spectrum ranging from real to virtual spaces. |
BibTeX:
@incollection{Fellner*09vr,
author = {D.~W. Fellner and W. Müller-Wittig and M. Unbescheiden},
title = {Virtual and augmented reality},
booktitle = {Technology guide: Principles, Applications, Trends},
publisher = {Springer},
year = {2009},
pages = {250--255}
}
|
| Fellner, D.W., Behr, J. & Bockholt, U., Ma, D., Gausemeier, J., Fan, X. & Grafe, M. (ed.) (2009), "Instantreality -- a framework for industrial augmented and virtual reality applications", Proc. Sino-German Workshop "Virtual Reality & Augmented Reality in Industry", Vol.2, pp.78-83, Springer.
[Abstract] [BibTeX] [PDF] |
| Abstract: Rapid development in processing power, graphic cards and mobile computers open up a wide domain for Mixed Reality applications. Thereby the Mixed Reality continuum covers the complete spectrum from Virtual Reality using immersive projection technology to Augmented Reality using mobile systems like Smartphones and UMPCs. At the Fraunhofer Institute for Computer Graphics (IGD) the Mixed Reality Framework instantreality (www.instantreality.org) has been developed as a single and consistent interface for AR/VR developers. This framework provides a comprehensive set of features to support classic Virtual Reality (VR) as well as mobile Augmented Reality (AR). The goal is to provide a very simple application interface which includes the latest research results in the fields of high-realistic rendering, 3D user interaction and total-immersive display technology. The system design is based on various industry standards to facilitate application development and deployment. |
BibTeX:
@inproceedings{Fellner*09vrar,
author = {D.~W.~Fellner and J. Behr and U. Bockholt},
editor = {D. Ma and J. Gausemeier and X. Fan and M. Grafe},
title = {Instantreality -- a framework for industrial augmented and virtual reality applications},
booktitle = {Proc. Sino-German Workshop "Virtual Reality & Augmented Reality in Industry"},
publisher = {Springer},
year = {2009},
volume = {2},
pages = {78--83}
}
|
| Fünfzig, C., Ullrich, T., Fellner, D.W. & Bachelder, W.-D., (2009), "Terrain and Model Queries Using Scalar Representation With Wavelet Compression", IEEE Transactions on Instrumentation and Measurement, Vol.58, pp.1-1. |
BibTeX:
@article{Fuenfzig*08,
author = {C. Fünfzig and T. Ullrich and D.~W.~Fellner and W.-D. Bachelder},
title = {Terrain and Model Queries Using Scalar Representation With Wavelet Compression},
journal = {IEEE Transactions on Instrumentation and Measurement},
year = {2009},
volume = {58},
pages = {1--1},
doi = {http://dx.doi.org/10.1109/TIM.2009.2016879}
}
|
| Havemann, S., Settgast, V., Berndt, R., Eide, Ø. & Fellner, D.W., (2009), "The Arrigo Showcase Reloaded -- Towards a Sustainable Link between 3D and Semantics", ACM Journal on Computing and Cultural Heritage (JOCCH), Vol.2(1), pp.1-13. |
BibTeX:
@article{Havemann*09jocch,
author = {Sven Havemann and Volker Settgast and René Berndt and Øyvind Eide and Dieter W.~Fellner},
title = {The Arrigo Showcase Reloaded -- Towards a Sustainable Link between 3D and Semantics},
journal = {ACM Journal on Computing and Cultural Heritage (JOCCH)},
year = {2009},
volume = {2},
number = {1},
pages = {1--13},
doi = {http://dx.doi.org/10.1145/1551676.1551680}
}
|
| Havemann, S. & Fellner, D.W., (2009), "Patterns of Shape Design", Proc. I-KNOW '09 and I-SEMANTICS '09, pp.93-106.
[Abstract] [BibTeX] [PDF] |
| Abstract: A fundamental problem in processing 3D shapes is insufficient knowledge engineering. On the one hand there are numerous methods to design and manufacture 3D shapes in the real world. On the other hand, numerous digital methods for representing and processing shape have been developed in computer graphics. Most of these methods make certain assumptions about the kind of 3D objects that they will be used for: A surface smoothing algorithm, for instance, is not well suited for assemblies of rectangular blocks or for pipe networks. However, it is currently not possible to formulate the properties of a given shape explicitly in an commonly agreed way. This paper is a first step towards classifying structural descriptions of man-made shape. By listing construction principles and principles for their combination it follows a phenomenological approach. The purpose is to illustrate the inherent complexity of the domain, and to lay out the foundation for subsequent thorough knowledge engineering. |
BibTeX:
@inproceedings{Havemann-Fellner09iknow,
author = {Havemann, Sven and Fellner, Dieter W.},
title = {Patterns of Shape Design},
booktitle = {Proc. I-KNOW '09 and I-SEMANTICS '09},
year = {2009},
pages = {93-106}
}
|
| Hofmann, C., Hollender, N. & Fellner, D.W., Cordeiro, J. & et al. (ed.) (2009), "A workflow model for collaborative video annotation -- Supporting the Workflow of Collaborative Video Annotation and Analysis performed in Educational Settings", Proceedings of the International Conference on Computer Supported Education, CSEDU*09, pp.199-204, INSTICC Press.
[Abstract] [BibTeX] [PDF] |
| Abstract: There is a growing number of application scenarios for computer-supported video annotation and analysis in educational settings. In related research work, a large number of different research fields and approaches have been involved. Nevertheless, the support of the annotation workflow has been little taken into account. As a first step towards developing a framework that assist users during the annotation process, the single work steps, tasks and sequences of the workflow had to be identified. In this paper, a model of the underlying annotation workflow is illustrated considering its single phases, tasks, and iterative loops that can be especially associated with the collaborative processes taking place. |
BibTeX:
@inproceedings{Hofmann*09csedu,
author = {C. Hofmann and N. Hollender and D.~W. Fellner},
editor = {J. Cordeiro and et al.},
title = {A workflow model for collaborative video annotation -- Supporting the Workflow of Collaborative Video Annotation and Analysis performed in Educational Settings},
booktitle = {Proceedings of the International Conference on Computer Supported Education, CSEDU*09},
publisher = {INSTICC Press},
year = {2009},
pages = {199--204}
}
|
| Hofmann, C., Hollender, N. & Fellner, D.W., Schwill, A. (ed.) (2009), "Prozesse und Abläufe beim kollaborativen Wissenserwerb mittels computergestützter Videoannotation", Lernen im digitalen Zeitalter: DeLFI 2009. 7. e-Learning Fachtagung Informatik der Gesellschaft für Informatik, pp.115-126, Köllen.
[Abstract] [BibTeX] [PDF] |
| Abstract: Computergestützte Annotation und Analyse von Videoinhalten finden zunehmend Anwendung in unterschiedlichen Lehr-Lernszenarien. Eine Reihe von Projekten hat sich mit dem Forschungsbereich Videoannotation mit unterschiedlichen Forschungsschwerpunkten beschäftigt, diese fokussierten jedoch stets einen oder nur wenige Bestandteile des gesamten Annotationsprozesses. Bisher wurde den einzelnen Aufgaben, Prozessen und Abläufen, die einer (kollaborativen) Annotation von Videos zugrunde liegen, keine ausreichende Beachtung geschenkt. In diesem Beitrag möchten wir unter besonderer Berücksichtigung von einer Applikation in kollaborativen Lehr-Lernsituationen ein Modell präsentieren, das die Phasen, die zu erledigenden Aufgaben sowie die konkreten Abläufe innerhalb von Videoannotationsprozessen beschreibt. |
BibTeX:
@inproceedings{Hofmann*09defli,
author = {C. Hofmann and N. Hollender and D.~W. Fellner},
editor = {A. Schwill},
title = {Prozesse und Abläufe beim kollaborativen Wissenserwerb mittels computergestützter Videoannotation},
booktitle = {Lernen im digitalen Zeitalter: DeLFI 2009. 7. e-Learning Fachtagung Informatik der Gesellschaft für Informatik},
publisher = {Köllen},
year = {2009},
pages = {115--126}
}
|
| Hofmann, C., Hollender, N. & Fellner, D.W., (2009), "Workflow-based Architecture for Collaborative Video Annotation", Proceedings of the 13th International Conference on Human-Computer Interaction (HCI 09), pp.33-42, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: In video annotation research, a large number of different research fields and approaches have been involved. Nevertheless, the support of the annotation workflow has been little taken into account. Previous research projects focus each on a different essential part of the whole annotation process. In this paper, we present our results concerning an analysis of the tasks and processes involved in computer-supported collaborative video annotation and analysis. First, a model of the underlying annotation workflow is going to be illustrated considering its single phases and iterative loops that can be especially associated with collaborative processes taking place. Furthermore, and as our main contribution, we derive a respective reference architecture which bases on the established workflow model. |
BibTeX:
@inproceedings{Hofmann*09hcii,
author = {C. Hofmann and N. Hollender and D.~W. Fellner},
title = {Workflow-based Architecture for Collaborative Video Annotation},
booktitle = {Proceedings of the 13th International Conference on Human-Computer Interaction (HCI 09)},
publisher = {Springer},
year = {2009},
pages = {33--42},
doi = {http://dx.doi.org/10.1007/978-3-642-02774-1_4}
}
|
| Hofmann, C., Hollender, N. & Fellner, D.W., Wandke, H. & et al. (ed.) (2009), "Task- and Process-related Design of Video Annotation Systems", Mensch und Computer 2009, pp.173-182, Gesellschaft für Informatik.
[Abstract] [BibTeX] [PDF] |
| Abstract: Various research projects already followed up the design of video annotation applications. Nevertheless, collaborative application scenarios as well as the needs of users regarding the annotation workflow have been taken little into account. This paper discusses requirements for the design of video annotation systems. As our main contribution, we consider aspects that can be associated with collaborative use scenarios as well as requirements respecting the support of the annotation workflow not only considering the tasks but also the processes and sequences within. Our goals are to provide the reader with an understanding of the specific characteristics and requirements of video annotation, to establish a framework for evaluation, and to guide the design of video annotation tools. |
BibTeX:
@inproceedings{Hofmann*09mc,
author = {C. Hofmann and N. Hollender and D.~W. Fellner},
editor = {H. Wandke and et al.},
title = {Task- and Process-related Design of Video Annotation Systems},
booktitle = {Mensch und Computer 2009},
publisher = {Gesellschaft für Informatik},
year = {2009},
pages = {173--182}
}
|
| Hohmann, B., Krispel, U., Havemann, S. & Fellner, D.W., Remondino, F., El-Hakim, S. & Gonzo, L. (ed.) (2009), "Cityfit: high-quality urban reconstructions by fitting shape grammars to images and derived textured point clouds", Proceedings of the 3rd ISPRS International Workshop 3D-ARCH 2009, ISPRS.
[Abstract] [BibTeX] [PDF] |
| Abstract: Many approaches for automatic 3D city reconstruction exist, but they are still missing an important feature: detailed facades. The goal of the CityFit project is to reconstruct the facades of 80% of the buildings in the city of Graz fully automatically. The challenge is to establish a complete workflow, ranging from acquisition of images and LIDAR data over 2D/3D feature detection and recognition to the generation of lean polygonal facade models. The desired detail level is to represent all significant facade elements larger than 50 cm by explicit polygonal geometry. All geometry shall also carry descriptive annotations (semantic enrichment). This paper presents an outline of the workflow, important design decisions, and the current state of the project. First results were obtained by case studies of facade analysis followed by manual reconstruction. This gave important hints how to structure grammars for automatic reconstruction. |
BibTeX:
@inproceedings{Hohmann*2009arch,
author = {B. Hohmann and U. Krispel and S. Havemann and D. W. Fellner},
editor = {F. Remondino and S. El-Hakim and L. Gonzo},
title = {Cityfit: high-quality urban reconstructions by fitting shape grammars to images and derived textured point clouds},
booktitle = {Proceedings of the 3rd ISPRS International Workshop 3D-ARCH 2009},
publisher = {ISPRS},
year = {2009}
}
|
| Settgast, V., Lancelle, M., Havemann, S. & Fellner, D.W., (2009), "Spatially Coherent Visualization of Image Detection Results using Video Textures", Proceeding of the 33th Workshop of the Austrian Association for Pattern Recognition (AAPR/OAGM), Vol.1, pp.13-23.
[Abstract] [BibTeX] [PDF] |
| Abstract: Camera-based object detection and tracking are image processing tasks that typically do not take 3D information into account. Spatial relations, however, are sometimes crucial to judge the correctness or importance of detection and tracking results. Especially in applications with a large number of image processing tasks running in parallel, traditional methods of presenting detection results do not scale. In such cases it can be very useful to transform the detection results back into their common 3D space. We present a computer graphics system that is capable of showing a large number of detection results in real-time, using different levels of abstraction, on various hardware configurations. As example application we demonstrate our system with a surveillance task involving eight cameras. |
BibTeX:
@article{Settgast*2009aapr,
author = {Settgast, Volker and Lancelle, Marcel and Havemann, Sven and Fellner, Dieter W.},
title = {Spatially Coherent Visualization of Image Detection Results using Video Textures},
journal = {Proceeding of the 33th Workshop of the Austrian Association for Pattern Recognition (AAPR/OAGM)},
year = {2009},
volume = {1},
pages = {13--23}
}
|
| Strobl, M., Berndt, R., Havemann, S. & Fellner, D.W., Debattista, K. (ed.) (2009), "Publishing 3D Content as PDF in Cultural Heritage", VAST09: The 10th International Symposium on Virtual Reality, Archaeology and Intelligent Cultural Heritage, pp.117-124, Eurographics.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Sharing 3D models with embedded annotations and additional information in a general accessible way still is a major challange. Using 3D technologies must become much easier, in particular in areas such as Cultural Heritage, where archeologists, art historians, and museum curators rely on robust, easy to use solutions. Sustainable exchange standards are vital since unlike in industry, no sophisticated PLM or PDM solutions are common in CH. To solve this problem we have examined the PDF file format and developed concepts and software for the exchange of annotated 3D models in a way that is not just comfortable but also sustainable. We show typical use cases for authoring and using PDF documents containing annotated 3D geometry. The resulting workflow is eficient and suitable for experienced users as well as for users working only with standard word processing tools and e-mail clients (plus, currently, Acrobat Pro Extended). |
BibTeX:
@inproceedings{Strobl*09vast,
author = {M. Strobl and R. Berndt and S. Havemann and D.~W. Fellner},
editor = {K. Debattista},
title = {Publishing 3D Content as PDF in Cultural Heritage},
booktitle = {VAST09: The 10th International Symposium on Virtual Reality, Archaeology and Intelligent Cultural Heritage},
publisher = {Eurographics},
year = {2009},
pages = {117--124},
doi = {http://dx.doi.org/10.2312/VAST/VAST09/117-124}
}
|
| Ullrich, T., Settgast, V., Ofenböck, C. & Fellner, D.W., Hirose, M., Schmalstieg, D., Wingrave, C.A. & Hishimura, K. (ed.) (2009), "Desktop Integration in Graphics Environments", Virtual Environments 2009; Joint Virtual Reality Conference of EGVE - ICAT - EuroVR, pp.109-112, Eurographics Association.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: In this paper, we present the usage of the Remote Desktop Protocol to integrate arbitrary, legacy applications in various environments. This approach accesses a desktop on a real computer or within a virtual machine. The result is not one image of the whole desktop, but a sequence of images of all desktop components (windows, dialogs, etc.). These components are rendered into textures and fed into a rendering framework (OpenSG). There the functional hierarchy is represented by a scene graph. In this way the desktop components can be rearranged freely and painted according to circumstances of the graphical environment supporting a wide range of display settings - from immersive environments via high-resolution tiled displays to mobile devices. |
BibTeX:
@inproceedings{Ullrich*09egve,
author = {Torsten Ullrich and Volker Settgast and Christian Ofenböck and Dieter W.~Fellner},
editor = {Hirose, M. and Schmalstieg, D. and Wingrave, Ch. A. and Hishimura, K.},
title = {Desktop Integration in Graphics Environments},
booktitle = {Virtual Environments 2009; Joint Virtual Reality Conference of EGVE - ICAT - EuroVR},
publisher = {Eurographics Association},
year = {2009},
pages = {109--112},
doi = {http://dx.doi.org/10.2312/EGVE/JVRC09/109-112}
}
|
2008 |
| Berndt, R., Havemann, S., Settgast, V. & Fellner, D.W., Ioannides, M. (ed.) (2008), "Sustainable Markup and Annotation of 3D Geometry", Proceedings of the 14th International Conference on Virtual Systems and Multimedia (VSMM 2008), pp.187-193, International Society on Virtual Systems and MultiMedia.
[Abstract] [BibTeX] [PDF] |
| Abstract: We propose a novel general method to enrich ordinary 3D models with semantic information. Based on the Collada format this approach fits perfectly into the XML world: It allows bi-directional linking, from a web resource to a (part of) a 3D model, and the reverse direction as well. We also describe our software framework prototype for 3D-annotation by non-3D-specialists, in our case cultural heritage professionals. |
BibTeX:
@inproceedings{Berndt*08vsmm,
author = {Rene Berndt and Sven Havemann and Volker Settgast and Dieter W.~Fellner},
editor = {Marions Ioannides},
title = {Sustainable Markup and Annotation of 3D Geometry},
booktitle = {Proceedings of the 14th International Conference on Virtual Systems and Multimedia (VSMM 2008)},
publisher = {International Society on Virtual Systems and MultiMedia},
year = {2008},
pages = {187--193}
}
|
| Fellner, D.W., Kamps, T., Kohlhammer, J. & Stricker, A., (2008), "Vorsprung durch Wissen", ZWF Zeitschrift für wirtschaftlichen Fabrikbetrieb, Vol.103, pp.205-208.
[Abstract] [BibTeX] [PDF] |
| Abstract: For over 20 years scientists of the Fraunhofer Institute for Computer Graphics IGD would not leave knowledge management to chance. The researchers develop intelligent searching solutions and information visualization technologies. With their innovations they give companies and organizations the opportunity to react on the requirements of today's dynamic information society. ConWeaver, a software developed at the Fraunhofer IGD, offers a semantic and integrated search beyond limits of databases. The searching system extracts company knowledge automated from heterogeneous data sources and represents it in the form of multilingual, semantic knowledge meshes. The Visual Analytics Group of the Fraunhofer IGD deals with visualization of data and analysis of information. The scientists develop real-time solutions for the simulation and interactive visualization of big multidimensional amounts of data and information. |
BibTeX:
@article{Fellner*08ZWF,
author = {Dieter W.~Fellner and Thomas Kamps and Jörn Kohlhammer and Anna Stricker},
title = {Vorsprung durch Wissen},
journal = {ZWF Zeitschrift für wirtschaftlichen Fabrikbetrieb},
year = {2008},
volume = {103},
pages = {205--208}
}
|
| Havemann, S., Settgast, V., Berndt, R., Eide, Ø. & Fellner, D.W., (2008), "The Arrigo Showcase Reloaded -- Towards a Sustainable Link between 3D and Semantics", Proc. VAST 2008 Intl. Symp., pp.125-132, Eurographics.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: It is still a big technical problem to establish a relation between a shape and its meaning in a sustainable way. We present a solution with a markup method that allows to label parts of a 3D object in a similar way to labeling parts of a hypertext. A 3D-markup can serve both as hyperlink and as link anchor, which is the key to bi-directional linking between 3D objects and web documents. Our focus is on a sustainable 3D software infrastructure for application scenarios ranging from e-mail and internet over authoring and browsing semantic networks to interactive museum presentations. We demonstrate the workflow and the effectiveness of our tools by re-doing the Arrigo 3D showcase. We are working towards a 'best practice' example for information modeling in cultural heritage. |
BibTeX:
@inproceedings{Havemann*08vast,
author = {Sven Havemann and Volker Settgast and René Berndt and Øyvind Eide and Dieter W.~Fellner},
title = {The Arrigo Showcase Reloaded -- Towards a Sustainable Link between 3D and Semantics},
booktitle = {Proc. VAST 2008 Intl. Symp.},
publisher = {Eurographics},
year = {2008},
pages = {125--132},
doi = {http://dx.doi.org/10.2312/VAST/VAST08/125-132}
}
|
| Havemann, S. & Fellner, D.W., (2008), "Progressive Combined B-reps -- Multi-Resolution Meshes for Interactive Real-time Shape Design", Journal of WSCG, Vol.16(1-3), pp.121-133.
[BibTeX] [PDF] |
BibTeX:
@article{Havemann*08wscg,
author = {S. Havemann and Dieter W.~Fellner},
title = {Progressive Combined B-reps -- Multi-Resolution Meshes for Interactive Real-time Shape Design},
journal = {Journal of WSCG},
year = {2008},
volume = {16},
number = {1-3},
pages = {121--133}
}
|
| Lancelle, M., Settgast, V. & Fellner, D., (2008), "Definitely Affordable Virtual Environment", Proc. IEEE Virtual Reality, pp.1-1, IEEE.
[Abstract] [BibTeX] [PDF] |
| Abstract: The DAVE is an immersive projection environment, a foursided CAVE. DAVE stands for 'definitely affordable virtual environment'. 'Affordable' means that by mostly using standard hardware components we can greatly reduce costs compared to other commercial systems. We show the hardware setup and some applications in the accompanying video. In 2005 we buildt a new version of our DAVE at the University of Technology in Graz, Austria. Room restrictions motivated a new compact design to optimally use the available space. The back projection material with a custom shape is streched to the wooden frame to provide a flat surface without ripples. |
BibTeX:
@inproceedings{Lancelle*08ieeevr,
author = {M. Lancelle and V. Settgast and D. Fellner},
title = {Definitely Affordable Virtual Environment},
booktitle = {Proc. IEEE Virtual Reality},
publisher = {IEEE},
year = {2008},
pages = {1-1}
}
|
| Mendez, E., Schall, G., Havemann, S., Fellner, D., Schmalstieg, D. & Junghanns, S., (2008), "Generating Semantic 3D Models of Unterground Infrastructure", IEEE Computer Graphics and Applications, Vol.28(3), pp.48-57.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: By combining two previously unrelated techniques -- semantic markup in a scene-graph and generative modeling -- a new framework retains semantic information until late in the rendering pipeline. This is a crucial prerequisite for achieving enhanced visualization effects and interactive behavior that doesn't compromise interactive frame rates. The proposed system creates interactive 3D visualizations from 2D geospatial databases in the domain of utility companies' underground infrastructure, creating urban models based on the companies' real-world data. The system encodes the 3D models in a scene-graph that mixes visual models with semantic markup that interactively filters and styles the models. The actual graphics primitives are generated on the fly by scripts that are attached to the scene-graph nodes. |
BibTeX:
@article{Mendez*08ieeecga,
author = {E. Mendez and G. Schall and S. Havemann and D. Fellner and D. Schmalstieg and S. Junghanns},
title = {Generating Semantic 3D Models of Unterground Infrastructure},
journal = {IEEE Computer Graphics and Applications},
year = {2008},
volume = {28},
number = {3},
pages = {48--57},
doi = {http://dx.doi.org/10.1109/MCG.2008.53}
}
|
| Offen, L. & Fellner, D., Linsen, L., Hagen, H. & Hamann, B. (ed.) (2008), "BioBrowser -- Visualization of and Access to Macro-Molecular Structures", Visualization in Medicine and Life Sciences, pp.257-273, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Based on the results of an interdisciplinary research project the paper addresses the embedding of knowledge about the function of different parts/structures of a macro molecule (protein, DNA, RNA) directly into the 3D model of this molecule. Thereby the 3D visualization becomes an important user interface component when accessing domain-specific knowledge -- similar to a web browser enabling its users to access various kinds of information. In the prototype implementation -- named Biobrowser -- various information related to bio-research is managed by a database using a fine-grain access control. This also supports restricting the access to parts of the material based on the user privileges. The database is supplied by a SOAP web service so that is it possible (after identifying yourself by a login procedure of course) to query, to change, or to add some information remotely by using the 3D model of the molecule. All these actions are performed on sub structures of themolecules. These can be selected either by an easy query language or by just picking them in the 3D model with the mouse. |
BibTeX:
@incollection{Offen-Fellner06vmls,
author = {Offen, Lars and Fellner, Dieter},
editor = {Lars Linsen and Hans Hagen and Bernd Hamann},
title = {BioBrowser -- Visualization of and Access to Macro-Molecular Structures},
booktitle = {Visualization in Medicine and Life Sciences},
publisher = {Springer},
year = {2008},
pages = {257-273},
doi = {http://dx.doi.org/10.1007/978-3-540-72630-2}
}
|
| Schreck, T., Fellner, D. & Keim, D., (2008), "Towards automatic feature vector optimization for multimedia applications", SAC '08: Proceedings of the 2008 ACM symposium on Applied computing, pp.1197-1201, ACM.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We systematically evaluate a recently proposed method for unsupervised discrimination power analysis for feature selection and optimization in multimedia applications. A series of experiments using real and synthetic benchmark data is conducted, the results of which indicate the suitability of the method for unsupervised feature selection and optimization. We present an approach for generating synthetic feature spaces of varying discrimination power, modelling main characteristics from real world feature vector extractors. A simple, yet powerful visualization is used to communicate the results of the automatic analysis to the user. |
BibTeX:
@inproceedings{Schreck*08sac,
author = {Tobias Schreck and Dieter Fellner and Daniel Keim},
title = {Towards automatic feature vector optimization for multimedia applications},
booktitle = {SAC '08: Proceedings of the 2008 ACM symposium on Applied computing},
publisher = {ACM},
year = {2008},
pages = {1197--1201},
doi = {http://dx.doi.org/10.1145/1363686.1363964}
}
|
| Steiner, M., Reiter, P., Ofenböck, C., Settgast, V., Ullrich, T., Lancelle, M. & Fellner, D.W., (2008), "Intuitive Navigation in Virtual Environments", Proceedings of Eurographics Symposium on Virtual Environments, Vol.14, pp.5-8.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present several novel ways of interaction and navigation in virtual worlds. Using the optical tracking system of our four-sided Definitely Affordable Virtual Environment (DAVE), we designed and implemented navigation and movement controls using the user's gestures and postures. Our techniques are more natural and intuitive than a standard 3D joystick-based approach, which compromises the immersion's impact. |
BibTeX:
@inproceedings{Steiner*08egve,
author = {Steiner, Markus and Reiter, Philipp and Ofenböck, Christian and Settgast, Volker and Ullrich, Torsten and Lancelle, Marcel and Fellner, Dieter W.},
title = {Intuitive Navigation in Virtual Environments},
booktitle = {Proceedings of Eurographics Symposium on Virtual Environments},
year = {2008},
volume = {14},
pages = {5-8},
doi = {http://dx.doi.org/10.2312/PE/VE2008Posters/005-008}
}
|
| Ullrich, T., Techmann, T. & Fellner, D.W., (2008), "Web-based Algorithm Tutorials in Different Learning Scenarios", World Conference on Educational Multimedia, Hypermedia and Telecommunications (ED-Media), Vol.20, pp.5467-5472.
[Abstract] [BibTeX] [PDF] |
| Abstract: The combination of scripting languages with web technologies offers many possibilities in teachings. This paper presents a scripting framework that consists of a Java and JavaScript engine and an included editor. It allows editing scripts and source code online, writing new applications, modifying existing applications and starting them from within the editor by a simple mouse click. This framework is a good basis for online tutorials. Included scripts that are ready to run are able to replace simple Java applets without drawbacks but with much more possibilities. Furthermore these scripts are perfect in different teaching scenarios: demo applications can be started via web browser and can be modified just in time. This modification can be done during lecture or within a drill-and-practice session. Examples in the context of computer graphics illustrate the usefulness of our framework in lectures. |
BibTeX:
@inproceedings{Ullrich*08edmedia,
author = {Ullrich, Torsten and Techmann, Torsten and Fellner, Dieter W.},
title = {Web-based Algorithm Tutorials in Different Learning Scenarios},
booktitle = {World Conference on Educational Multimedia, Hypermedia and Telecommunications (ED-Media)},
year = {2008},
volume = {20},
pages = {5467-5472}
}
|
| Ullrich, T., Settgast, V. & Fellner, D.W., (2008), "Semantic Fitting and Reconstuction", Journal on Computing and Cultural Heritage (JOCCH), Vol.1, pp.1-20.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: The current methods to describe the shape of three-dimensional objects can be classified into two groups: methods following the composition of primitives approach and descriptions based on procedural shape representations. As a 3D acquisition device returns an agglomeration of elementary objects (e.g. a laser scanner returns points), the model acquisition pipeline always starts with a composition of primitives. Due to the semantic information carried with a generative description, a procedural model provides valuable metadata that make up the basis for digital library services: retrieval, indexing, and searching. An important challenge in computer graphics in the field of cultural heritage is to build a bridge between the generative and the explicit geometry description combining both worlds-the accuracy and systematics of generative models with the realism and the irregularity of real-world data. A first step towards a semantically enriched data description is a reconstruction algorithm based on decreasing exponential fitting. This approach is robust towards outliers and multiple dataset mixtures. It does not need a preceding segmentation and is able to fit a generative shape template to a point cloud identifying the parameters of a shape. |
BibTeX:
@article{Ullrich*08jocch,
author = {Torsten Ullrich and Volker Settgast and Dieter W.~Fellner},
title = {Semantic Fitting and Reconstuction},
journal = {Journal on Computing and Cultural Heritage (JOCCH)},
year = {2008},
volume = {1},
pages = {1--20},
doi = {http://dx.doi.org/10.1145/1434763.1434769}
}
|
| Ullrich, T., Settgast, V. & Fellner, D.W., (2008), "Semantic Fitting and Reconstruction", Journal on Computing and Cultural Heritage (JOCCH), Vol.1(2), pp.online. |
BibTeX:
@article{Ullrich*08Joch,
author = {Ullrich, Torsten and Settgast, Volker and Fellner, Dieter W.},
title = {Semantic Fitting and Reconstruction},
journal = {Journal on Computing and Cultural Heritage (JOCCH)},
year = {2008},
volume = {1},
number = {2},
pages = {online},
doi = {http://dx.doi.org/10.1145/1434763.1434769}
}
|
| Ullrich, T., Settgast, V. & Fellner, D.W., (2008), "Distance Visualization for Geometric Analysis", Proceedings of the Conference on Virtual Systems and MultiMedia Dedicated to Digital Heritage (VSMM), pp.334-340.
[Abstract] [BibTeX] [PDF] |
| Abstract: The need to analyze and visualize differences of very similar objects arises in many research areas: mesh compression, scan alignment, nominal/actual value comparison, quality management, and surface reconstruction to name a few. Although the problem to visualize some distances may sound simple, the creation of a good scene setup including the geometry, materials, colors, and the representation of distances is challenging. Our contribution to this problem is an application which optimizes the work-flow to visualize distances. We propose a new classification scheme to group typical scenarios. For each scenario we provide reasonable defaults for color tables, material settings, etc. Completed with predefined file exporters, which are harmonized with commonly used rendering and viewing applications, the presented application is a valuable tool. Based on web technologies it works out-of-the-box and does not need any configuration or installation. All users who have to analyze and document 3D geometry will stand to benefit from our new application. |
BibTeX:
@inproceedings{Ullrich*08vsmm,
author = {Torsten Ullrich and Volker Settgast and Dieter W.~Fellner},
title = {Distance Visualization for Geometric Analysis},
booktitle = {Proceedings of the Conference on Virtual Systems and MultiMedia Dedicated to Digital Heritage (VSMM)},
year = {2008},
pages = {334-340}
}
|
| Ullrich, T., Ulrich, U.K. & Fellner, D.W., (2008), "Compilation of procedural models", Proceedings of the 13th International Symposium on 3D Web Technology (Web3D 2008), pp.75-81, ACM.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Scripting techniques are used in various contexts. The field of application ranges from layout description languages (PostScript), user interface description languages (XUL) and classical scripting languages (JavaScript) to action nodes in scene graphs (VRMLScript) and web-based desktop applications (AJAX). All these applications have an increase of scripted components in common -- especially in computer graphics. As the interpretation of a geometric script is computationally more intensive than the handling of static geometry, optimization techniques, such as justin- time compilation, are of great interest. Unfortunately, scripting languages tend to support features such as higher order functions or self-modification, etc. These language characteristic are difficult to compile into machine/byte-code. Therefore, we present a hybrid approach: an interpreter with an integrated compiler. In this way we speed up the script evaluation without having to remove any language features e.g. the possibility of self-modifications. We demonstrate its usage at XGML -- a dialect of the generative modeling language GML, which is characterized by its dynamic behavior. |
BibTeX:
@inproceedings{Ullrich*08web3d,
author = {Torsten Ullrich and Ulrich Krispel Ulrich and Dieter W. Fellner},
title = {Compilation of procedural models},
booktitle = {Proceedings of the 13th International Symposium on 3D Web Technology (Web3D 2008)},
publisher = {ACM},
year = {2008},
pages = {75--81},
doi = {http://dx.doi.org/10.1145/1394209.1394226}
}
|
2007 |
| Bustos, B., Fellner, D., Havemann, S., Keim, D.A., Saupe, D. & Schreck, T., (2007), "Foundations of 3D Digital Libraries: Current Approaches and Urgent Research Challenges", DELOS Network of Excellence on Digital Libraries;Pre-Proceedings of the First International Workshopon Digital Libraries Foundations, pp.7-12.
[Abstract] [BibTeX] [PDF] |
| Abstract: 3D documents are an indispensable data type in many important application domains such as Computer Aided Design, Simulation and Visualization, and Cultural Hritage, to name a few. The 3D document type can represent arbitrarily complex information by composing geometrical, topological, structural, or material properties, among others. It often is integrated with meta data and annotation by the various application systems that produce, process, or consume 3D documents. We argue that due to the inherent complexity of the 3D data type in conjunction with and imminent pervasive usage and explosion of available content, there is pressing need to address key problems of the 3D data type. These problems need to be tackled before the 3D data type can be fully supported by Digital Library technology in the sense of a generalized document, unlocking its full potential. If the problems are addressed appropriately, the expected benefits are manifold and may lead to radically improvedproduction, processing, and consumption of 3D content. |
BibTeX:
@inproceedings{Bustos*07,
author = {B. Bustos and D. Fellner and S. Havemann and D.~A. Keim and D. Saupe and T. Schreck},
title = {Foundations of 3D Digital Libraries: Current Approaches and Urgent Research Challenges},
booktitle = {DELOS Network of Excellence on Digital Libraries;Pre-Proceedings of the First International Workshopon Digital Libraries Foundations},
year = {2007},
pages = {7-12}
}
|
| Fellner, D.W., Saupe, D. & Krottmaier, H., (2007), "Guest Editors' Introduction: 3D Documents", IEEE CG&A, Vol.27(4), pp.20-21. |
BibTeX:
@article{Fellner*07ieeecga,
author = {D. W. Fellner and D. Saupe and H. Krottmaier},
title = {Guest Editors' Introduction: 3D Documents},
journal = {IEEE CG&A},
year = {2007},
volume = {27},
number = {4},
pages = {20-21},
doi = {http://dx.doi.org/10.1109/MCG.2007.83}
}
|
| Fellner, D.W., Saupe, D. & Krottmaier, H. (ed.) (2007), "IEEE CG&A", IEEE. |
BibTeX:
@inbook{Fellner*07ieeecga2,,
editor = {D. W. Fellner and D. Saupe and H. Krottmaier},
title = {IEEE CG&A},
publisher = {IEEE},
year = {2007},
doi = {http://dx.doi.org/10.1109/MCG.2007.83}
}
|
| Fünfzig, C., Ullrich, T., Fellner, D. & Bachelder, W.-D., (2007), "Empirical Comparision of Data Structures for Line-Of-Sight Computation", International Symposium of Intelligent Signal Processing, pp.291-296.
[Abstract] [BibTeX] [PDF] |
| Abstract: Line-of-sight (LOS) computation is important for interrogation of heightfield grids in the context of geo information and many simulation tasks like electromagnetic wave propagation and flight surveillance. Compared to searching the regular grid directly, more advanced data structures like a 2.5d kd-tree offer better performance. We describe the definition of a 2.5d kd-tree from the digital elevation model and its use for LOS computation on a point-reconstructed or bilinear-reconstructed terrain surface. For compact storage, we use a wavelet-like storage scheme which saves one half of the storage space without considerably compromising the runtime performance. We give an empirical comparison of both approaches on practical data sets which show the method of choice for CPU computation of LOS. |
BibTeX:
@inproceedings{Fuenfzig*07,
author = {C. Fünfzig and T. Ullrich and D. Fellner and W.-D. Bachelder},
title = {Empirical Comparision of Data Structures for Line-Of-Sight Computation},
booktitle = {International Symposium of Intelligent Signal Processing},
year = {2007},
pages = {291--296}
}
|
| Havemann, S., Hopp, A. & Fellner, D., Fröhlich, B., Blach, R. & v. Liere, R. (ed.) (2007), "A Single Chip DLP Projector for Stereoscopic Images of High Color Quality and Resolution", Proc. 13th EG Symposium on Virtual Environments,10th Immersive Projection Technology, pp.21-26, Eurographics.
[Abstract] [BibTeX] [PDF] |
| Abstract: We present a novel stereoscopic projection system. It combines all the advantages of modern single-chip DLP technology -- attractive price, great brightness, high contrast, superior resolution and color quality -- with those of active stereoscopy: invariance to the orientation of the user and an image separation of nearly 100 With a refresh rate of 60 Hz per eye (120 Hz in total) our system is flicker-free even for sensitive users. The system permits external projector synchronisation which allows to build up affordable stereoscopic multi-projector systems, e.g., for immersive visualisation. |
BibTeX:
@inproceedings{Havemann*07egve,
author = {S. Havemann and A. Hopp and D. Fellner},
editor = {B. Fröhlich and R. Blach and R. v.~Liere},
title = {A Single Chip DLP Projector for Stereoscopic Images of High Color Quality and Resolution},
booktitle = {Proc. 13th EG Symposium on Virtual Environments,10th Immersive Projection Technology},
publisher = {Eurographics},
year = {2007},
pages = {21--26}
}
|
| Havemann, S., Settgast, V., Lancelle, M. & Fellner, D.W., (2007), "3D-Powerpoint -- A Design Tool for Digital Exhibitions of Cultural Artifacts", Proc. VAST 2007 Intl. Symp., pp.39-46, Eurographics.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We describe first steps towards a suite of tools for CH professionals to set up and run digital exhibitions of cultural 3D artifacts in museums. Both the authoring and the presentation views shall finally be as easy to use as, e.g., Microsoft Powerpoint. But instead of separated slides our tool uses pre-defined 3D scenes, called "layouts", containing geometric objects acting as placeholders, called "drop targets". They can be replaced quite easily, in a drag-and-drop fashion, by digitized 3D models, and also by text and images, to customize and adapt a digital exhibition to the style of the real museum. Furthermore, the tool set contains easy-to-use tools for the rapid 3D modeling of simple geometry and for the alignment of given models to a common coordinate system. The technical innovation is that the tool set is not a monolithic application. Instead it is completely based on scripted designs, using the OpenSG scene graph engine and the GML scripting language. This makes it extremely flexible: Anybody capable of drag-and-drop can design 3D exhibitions. Anybody capable of GML scripting can create new designs. And finally, we claim that the presentation setup of our designs is 'grandparent-compliant', meaning that it permits to the public audience the detailed inspection of beautiful cultural 3D objects without getting lost or feeling uncomfortable. |
BibTeX:
@inproceedings{Havemann*07vast,
author = {Havemann, Sven and Settgast, Volker and Lancelle, Marcel and Fellner, Dieter W.},
title = {3D-Powerpoint -- A Design Tool for Digital Exhibitions of Cultural Artifacts},
booktitle = {Proc. VAST 2007 Intl. Symp.},
publisher = {Eurographics},
year = {2007},
pages = {39-46},
doi = {http://dx.doi.org/10.2312/VAST/VAST07/039-046}
}
|
| Havemann, S. & Fellner, D.W., (2007), "Seven Research Challenges of Generalized 3D Documents", IEEE Computer Graphics and Applications, Vol.27(3), pp.70-76.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: The rapid evolution of information and communication technology has always been a source for challenging new research questions in computer science. The vision of the emerging research field of semantic 3D is to establish the notion of generalized 3D documents that are full members of the family of generalized documents. This means that access would be content-based rather than based on metadata. The purpose of this article is to highlight the research issues that impede the realization of this vision today. The seven research challenges include: (1) '3D data set' can have many meanings, (2) a sustainable 3D file format, (3) representation-independent stable 3D markup, (4) representation-independent 3D query operations, (5) documenting provenance and processing history, (6) consistency between shape and meaning, and (7) closing the semantic gap. |
BibTeX:
@article{Havemann-Fellner07ieeecga-SevResChal,
author = {Havemann, Sven and Fellner, Dieter W.},
title = {Seven Research Challenges of Generalized 3D Documents},
journal = {IEEE Computer Graphics and Applications},
year = {2007},
volume = {27},
number = {3},
pages = {70-76},
doi = {http://dx.doi.org/10.1109/MCG.2007.67}
}
|
| Hopp, A., Fellner, D. & Havemann, S., (2007), "Cube 3D$^2$ -- Ein single Chip DLP stereo Projektor", IFF-Wissenschaftstage, pp.77-86, Fraunhofer-Institut für Fabrikbetrieb und -automatisierung.
[Abstract] [BibTeX] [PDF] |
| Abstract: Der Artikel beschreibt die erfolgreiche Entwicklung eines stereoskopiefähigen Digitalprojektors nach Zielvorgaben speziell für die Bereiche VR/AR. Dabei wurde nicht von den vorhandenen Technologien ausgegangen um ein VR/AR System zusammenzustellen, sondern explizit Zielvorgaben für ein solches System entwickelt um die Vor- und Nachteile bekannter Technologien zu minimieren. Dies führte zur Entwicklung eines völlig neuen 3D Projektors. |
BibTeX:
@inproceedings{Hopp*07,
author = {A. Hopp and D. Fellner and S. Havemann},
title = {Cube 3D$^2$ -- Ein single Chip DLP stereo Projektor},
booktitle = {IFF-Wissenschaftstage},
publisher = {Fraunhofer-Institut für Fabrikbetrieb und -automatisierung},
year = {2007},
pages = {77-86}
}
|
| Krottmaier, H., Kurth, F., Steenweg, T. & Appelrath, H-J.and Fellner, D.W., (2007), "PROBADO -- A Generic Repository Integration Framework", Research and Advanced Technology for Digital Libraries, ECDL 2007, Vol.4675, pp.518-521, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: The number of newly generated multimedia documents (e.g. music, e-learning material, or 3D-graphics) increases year by year. Today, the workflow in digital libraries focuses on textual documents only. Hence, considering content-based retrieval tasks, multimedia documents are not analyzed and indexed sufficiently. To facilitate content-based retrieval and browsing, it is necessary to introduce recent techniques for multimedia document processing into the workflow of nowadays digital libraries. In this short paper, we introduce the PROBADO-framework which will (a) integrate different types of content-repositories -- each one specialized for a specific multimedia domain -- into one seamless system, and (b) will add features available in text-based digital libraries (such as automatic annotation, full-text retrieval, or recommender services) to non-textual documents. Existing libraries will benefit from the framework since it extends existing technology for handling textual documents with features for dealing with the non-textual domain. |
BibTeX:
@incollection{Krottmaier*07ecdl,
author = {Krottmaier, H. and Kurth, F. and Steenweg, T. and Appelrath, H-J.and Fellner, D. W.},
title = {PROBADO -- A Generic Repository Integration Framework},
booktitle = {Research and Advanced Technology for Digital Libraries, ECDL 2007},
publisher = {Springer},
year = {2007},
volume = {4675},
pages = {518-521},
doi = {http://dx.doi.org/10.1007/978-3-540-74851-9}
}
|
| Krottmaier, H., Ball, R. (ed.) (2007), "Die Systemarchitektur von PROBADO: Der allgemeine Zugriff auf Repositorien mit nicht-textuellen Inhalte", Wissenschaftskommunikation der Zukunft, 4. Konferenz der Zentralbibliothek Forschungszentrum Jülich, pp.169-176.
[Abstract] [BibTeX] [PDF] |
| Abstract: Zentrale Fachbibliotheken und Fachinformationszentren haben bislang die Informationsversorgung mit Textdokumenten, vor allem Zeitschriftenartikel, für ihre Kunden aus Forschung, Lehre und Wirtschaft sicherstellen können. Exemplarisch sei hier auf die klassischen Bibliotheksdienstleistungen wie Dokumentlieferdienste, virtuelle Fachbibliotheken, aber auch auf digitale Bibliotheken verwiesen. Die Erfüllung dieses Versorgungsauftrages befindet sich allerdings durch neue mediale Formate und Multimedia-Objekte (z.B. Musik, Architekturmodelle und ELearning-Material) im Umbruch, die in der Praxis immer öfter von den Benutzern benötigt und angefordert werden und daher zur umfassenden Informationsversorgung über ein Bibliotheksportal dazugehören, das sowohl die Anforderungen einer text-basierten wie auch audio-visuellen Suche integriert. |
BibTeX:
@inproceedings{Krottmaier07,
author = {H. Krottmaier},
editor = {Rafael Ball},
title = {Die Systemarchitektur von PROBADO: Der allgemeine Zugriff auf Repositorien mit nicht-textuellen Inhalte},
booktitle = {Wissenschaftskommunikation der Zukunft, 4. Konferenz der Zentralbibliothek Forschungszentrum Jülich},
year = {2007},
pages = {169--176}
}
|
| Leeb, R., Settgast, V., Fellner, D. & Pfurtscheller, G., (2007), "Self-paced exploration of the Austrian National Library through thought", International Journal of Bioelectromagnetism, Vol.9(4), pp.237-244.
[Abstract] [BibTeX] [PDF] |
| Abstract: The results of a self-paced Brain-Computer Interface (BCI) are presented which are based on the detection of senorimotor electroencephalogram rhythms during motor imagery. The participants were given the task of moving through a virtual model of the Austrian National Library by performing motor imagery. This work shows that five participants which were trained in a synchronous BCI could sucessfully perform the asynchronous experiment. |
BibTeX:
@article{Leeb*07bci,
author = {R. Leeb and V. Settgast and D. Fellner and G. Pfurtscheller},
title = {Self-paced exploration of the Austrian National Library through thought},
journal = {International Journal of Bioelectromagnetism},
year = {2007},
volume = {9},
number = {4},
pages = {237-244}
}
|
| Sabin, M.A., Cashman, T.J., Augsdörfer, U.H. & Dodgson, N.A., (2007), "Bounded Curvature Subdivision Without Eigenanalysis", Mathematics of Surfaces XII, Vol.4647, pp.391-411, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: It has long been known how to achieve bounded curvature at extraordinary points of a subdivision scheme by using eigenanalysis and then adjusting the mask of each extraordinary point. This paper provides an alternative insight, based on the use of second divided differences, and applies it to three familiar schemes. A single concept is shown to work in three different contexts. In each case a bounded curvature variant results, with a very simple and elegant implementation. |
BibTeX:
@inproceedings{Malcolm*07lncs,
author = {Malcolm A. Sabin and Thomas J. Cashman and Ursula H. Augsdörfer and Neil A. Dodgson},
title = {Bounded Curvature Subdivision Without Eigenanalysis},
booktitle = {Mathematics of Surfaces XII},
publisher = {Springer},
year = {2007},
volume = {4647},
pages = {391-411},
doi = {http://dx.doi.org/10.1007/978-3-540-73843-5_24}
}
|
| Rauch, C., Krottmaier, H. & Tochtermann, K., (2007), "File-Formats for Preservation: Evaluating the Long-Term Stability of File-Formats", Openness in Digital Publishing, pp.101-106.
[Abstract] [BibTeX] [PDF] |
| Abstract: While some file-formats become unreadable after short periods, others remain interpretable over a long-term. Among the over 1.000 file-formats, some are better and some are less suited for long-term preservation. A standardized process for evaluating the stability of a file-format is described in this paper and its practical use is shown with file-formats for 3D-objects. Recommendations to users of 3D-applications are given in the last section of this article. Some of the results are used in PROBADO, a sophisticated search engine for non-traditional objects (such as 3D-documents, music etc.). |
BibTeX:
@inproceedings{Rauch*07elpub,
author = {C. Rauch and H. Krottmaier and K. Tochtermann},
title = {File-Formats for Preservation: Evaluating the Long-Term Stability of File-Formats},
booktitle = {Openness in Digital Publishing},
year = {2007},
pages = {101--106}
}
|
| Schreck, T., Tekušová, T., Kohlhammer, Jö. & Fellner, D., (2007), "Trajectory-based visual analysis of large financial time series data", ACM SIGKDD Explor. Newsl., Vol.9(2), pp.30-37, ACM.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present a novel stereoscopic projection system. It combines all the advantages of modern single-chip DLP technology - attractive price, great brightness, high contrast, superior resolution and color quality - with those of active stereoscopy: invariance to the orientation of the user and an image separation of nearly 100 With a refresh rate of 60 Hz per eye (120 Hz in total) our system is flicker-free even for sensitive users. The system permits external projector synchronisation which allows to build up affordable stereoscopic multi-projector systems, e.g., for immersive visualisation. |
BibTeX:
@article{Schreck*07sigkdd,
author = {Tobias Schreck and Tatiana Tekušová and Jörn Kohlhammer and Dieter Fellner},
title = {Trajectory-based visual analysis of large financial time series data},
journal = {ACM SIGKDD Explor. Newsl.},
publisher = {ACM},
year = {2007},
volume = {9},
number = {2},
pages = {30-37},
doi = {http://dx.doi.org/10.1145/1345448.1345454}
}
|
| Settgast, V., Ullrich, T. & Fellner, D.W., (2007), "Information Technology for Cultural Heritage", IEEE Potentials, Vol.26(4), pp.38-43.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Information technology applications in the field of cultural heritage include various disciplines of computer science. The work flow from archaeological discovery to scientific preparation demands multidisciplinary cooperation and interaction at various levels. This article describes the information technology pipeline from the computer science point of view. The description starts with the model acquisition. Computer vision algorithms are able to generate a raw three-dimensional (3D) model using input data such as photos and scans. In the next step, computer graphics methods create an accurate, highlevel model description. Besides geometric information, each model needs semantic metadata to perform digital library tasks such as storage, markup, indexing, and retrieval. A structured repository of virtual artifacts completes the pipeline - at least from the computer science point of view. |
BibTeX:
@article{Settgast*07ieeepot,
author = {Settgast, Volker and Ullrich, Torsten and Fellner, Dieter W.},
title = {Information Technology for Cultural Heritage},
journal = {IEEE Potentials},
year = {2007},
volume = {26},
number = {4},
pages = {38-43},
doi = {http://dx.doi.org/10.1109/MP.2007.4280332}
}
|
| Ullrich, T., Fünfzig, C. & Fellner, D.W., (2007), "Two Different Views On Collision Detection", IEEE Potentials, Vol.26(1), pp.26-30.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: In this article, we present two algorithms for precise collision detection between two potentially colliding objects. The first one uses axis-aligned bounding boxes (AABB) and is a typical representative of a computational geometry algorithm. The second one uses spherical distance fields originating in image processing. Both approaches address the following challenges of collision detection algorithms: just in time, little resources, inclusive etc. Thus both approaches are scalable in the information they give in collision determination and the analysis up to a fixed refinement level, the collision time depends on the granularity of the bounding volumes and it is also possible to estimate the time bounds for the collision test tightly. |
BibTeX:
@article{Ullrich*07ieeepot,
author = {Ullrich, Torsten and Fünfzig, Christoph and Fellner, Dieter W.},
title = {Two Different Views On Collision Detection},
journal = {IEEE Potentials},
year = {2007},
volume = {26},
number = {1},
pages = {26-30},
doi = {http://dx.doi.org/10.1109/MP.2007.343037}
}
|
| Ullrich, T., Settgast, V., Krispel, U. & Fünfzig, Christophand Fellner, D.W., (2007), "Distance Calculation between a Point and a Subdivision Surface", VMV 2007 Conf. Proc., pp.161-169.
[Abstract] [BibTeX] [PDF] |
| Abstract: This article focuses on algorithms for fast computation of the Euclidean distance between a query point and a subdivision surface. The analyzed algorithms include uniform tessellation approaches, an adaptive evalution technique, and an algorithm using Bezier conversions. These methods are combined with a grid hashing structure for space partitioning to speed up their runtime. The results show that a pretessellated surface is sufficient for small models. Considering the runtime, accuracy and memory usage an adaptive onthe-fly evaluation of the surface turns out to be the best choice. |
BibTeX:
@inproceedings{Ullrich*07vmv,
author = {Ullrich, T. and and Settgast, Volker and Krispel, U. and Fünfzig, Christophand Fellner, Dieter W.},
title = {Distance Calculation between a Point and a Subdivision Surface},
booktitle = {VMV 2007 Conf. Proc.},
year = {2007},
pages = {161-169}
}
|
| Ullrich, T. & Fellner, D.W., (2007), "Robust Shape Fitting and Semantic Enrichment", CIPA 2007 Conf. Proc., pp.727-732.
[Abstract] [BibTeX] [PDF] |
| Abstract: A robust fitting and reconstruction algorithm has to cope with two major problems. First of all it has to be able to deal with noisy input data and outliers. Furthermore it should be capable of handling multiple data set mixtures. The decreasing exponential approach is robust towards outliers and multiple data set mixtures. It is able to fit a parametric model to a given point cloud. As parametric models use a description which may not only contain a generative shape but information about the inner structure of an object, the presented approach can enrich measured data with an ideal description. This technique offers a wide range of applications. |
BibTeX:
@inproceedings{Ullrich-Fellner07cipa,
author = {Ullrich, T. and Fellner, Dieter W.},
title = {Robust Shape Fitting and Semantic Enrichment},
booktitle = {CIPA 2007 Conf. Proc.},
year = {2007},
pages = {727-732}
}
|
| Ullrich, T. & Fellner, D.W., (2007), "Client-side Scripting in Blended Learning Environment", ERCIM NEWS, Vol.71(71), pp.43-44.
[Abstract] [BibTeX] [PDF] |
| Abstract: The computer graphics tutorial CGTutorial was developed by the Institute of Computer Graphics and Knowledge Visualization at Graz University of Technology in Austria. It combines a scripting engine and a development environment with Java-based Web technology. The result is a flexible framework which allows algorithms to be developed and studied without the need to install libraries or set up compiler configurations. Together with already written example scripts, the framework is ready to use. Each example script is a small runnable demonstration application that can be started directly within a browser. Using a scripting engine that interprets Java and JavaScript on a client, the demos can be modified and analysed by the user and then restarted. This combination of scripting engines and Web technology is thus a perfect environment for blended learning scenarios. |
BibTeX:
@article{Ullrich-Fellner07ercim,
author = {Ullrich, T. and Fellner, Dieter W.},
title = {Client-side Scripting in Blended Learning Environment},
journal = {ERCIM NEWS},
year = {2007},
volume = {71},
number = {71},
pages = {43-44}
}
|
2006 |
| Augsdörfer, U.H., Dodgson, N.A. & Sabin, M.A., (2006), "Tuning subdivision by minimising Gaussian curvature variation near extraordinary vertices ", Computer Graphics Forum, Vol.25(3), pp.263-272.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present a method for tuning primal stationary subdivision schemes to give the best possible behaviour near extraordinary vertices with respect to curvature variation. Current schemes lead to a limit surface around extraordinary vertices for which the Gaussian curvature diverges, as demonstrated by Karciauskas et al. [KPR04]. Even when coefficients are chosen such that the subsubdominant eigenvalues, $, equal the square of the subdominant eigenvalue, $, of the subdivision matrix [DS78] there is still variation in the curvature of the subdivision surface around the extraordinary vertex as shown in recent work by Peters and Reif [PR04] illustrated by Karciauskas et al. [KPR04]. In our tuning method we optimise within the space of subdivision schemes with bounded curvature to minimise this variation in curvature around the extraordinary vertex. To demonstrate our method we present results for the Catmull-Clark [CC78], 4-8 [Vel01, VZ01] and 4-3 [PS03] subdivision schemes. We compare our results to previous work on the tuning of these schemes and show that the coefficients derived with this method give a significantly smaller curvature variation around extraordinary vertices. |
BibTeX:
@article{Augsdoerfer*06cgf,
author = {Ursula H. Augsdörfer and Neil A. Dodgson and Malcolm A. Sabin},
title = {Tuning subdivision by minimising Gaussian curvature variation near extraordinary vertices },
journal = {Computer Graphics Forum},
year = {2006},
volume = {25},
number = {3},
pages = {263-272},
doi = {http://dx.doi.org/10.1111/j.1467-8659.2006.00945.x}
}
|
| Fellner, D.W. & Havemann, S., Spiliopoulou, M., Kruse, R., Borgelt, C., Nürnberger, A. & Gaul, W. (ed.) (2006), "Striving for an adequate vocabulary: Next Generation 'Metadata'", From Data and Information Analysis to Knowledge Engineering, pp.13-20, Springer. |
BibTeX:
@incollection{Fellner-Havemann05gfkl,
author = {Fellner, Dieter W. and Havemann, Sven},
editor = {M. Spiliopoulou and R. Kruse and C. Borgelt and A. Nürnberger and W. Gaul},
title = {Striving for an adequate vocabulary: Next Generation 'Metadata'},
booktitle = {From Data and Information Analysis to Knowledge Engineering},
publisher = {Springer},
year = {2006},
pages = {13-20},
doi = {http://dx.doi.org/10.1007/3-540-31314-1_2}
}
|
| Fünfzig, C., Ullrich, T. & Fellner, D.W., (2006), "Hierarchical Spherical Distance Fields for Collision Detection", IEEE CG&A, Vol.26(1), pp.64-74.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: This article presents a fast collision detection technique for all types of rigid bodies, demonstrated using polygon soups. The new approach uses spherical distance fields, which are stored in a compact representation. |
BibTeX:
@article{Fuenfzig*06ieeecga,
author = {Fünfzig, Ch. and Ullrich, T. and Fellner, Dieter W.},
title = {Hierarchical Spherical Distance Fields for Collision Detection},
journal = {IEEE CG&A},
year = {2006},
volume = {26},
number = {1},
pages = {64-74},
doi = {http://dx.doi.org/10.1109/MCG.2006.17}
}
|
| Havemann, S., Settgast, V., Krottmaier, H. & Fellner, D.W., (2006), "On the Integration of 3D Models into Digital Cultural Heritage Libraries", Proc. VAST 2006 Intl. Symp., pp.161-169, Eurographics.
[Abstract] [BibTeX] [PDF] |
| Abstract: This paper discusses the integration of 3D data in the traditional CH workflow, which is a complex issue with many different aspects. First, the notion '3D data' must be defined appropriately, since 3D may range from raw datasets of individual artifacts to complete virtual worlds including storytelling and animations. Second, a suitable 3D format must be identified among the various, and very different, possible options. Third, the chosen format needs to be supported by all tools and technologies used in the CH tool chain: all the way from the field excavation over presentation in museum exhibitions, over secondary exploitation and database access, to the sustainable longtime archival of digitized artifacts. An integrated solution to this complex problem will be possible only through the tight combination of two basic technologies: 3D scenegraphs and XML |
BibTeX:
@inproceedings{Havemann*06vast,
author = {Havemann, Sven and Settgast, Volker and Krottmaier, Harald and Fellner, Dieter W.},
title = {On the Integration of 3D Models into Digital Cultural Heritage Libraries},
booktitle = {Proc. VAST 2006 Intl. Symp.},
publisher = {Eurographics},
year = {2006},
pages = {161--169}
}
|
| Lancelle, M., Offen, L., Ullrich, T., Techmann, T. & Fellner, D.W., (2006), "Minimally Invasive Projector Calibration for 3D Applications", Proc. GI Workshop Virtuelle und Erweiterte Realität, pp.193-201.
[Abstract] [BibTeX] [PDF] |
| Abstract: Addressing the typically time consuming adjustment of projector equipment in VR installations we propose an easy to implement projector calibration method that effectively corrects images projected onto planar surfaces and which does not require any additional hardware. For hardware accelerated 3D applications only the projection matrix has to be modified slightly thus there is no performance impact and existing applications can be adopted easily. |
BibTeX:
@inproceedings{Lancelle*06giarvr,
author = {Lancelle, Marcel and Offen, Lars and Ullrich, Torsten and Techmann, Torsten and Fellner, Dieter W.},
title = {Minimally Invasive Projector Calibration for 3D Applications},
booktitle = {Proc. GI Workshop Virtuelle und Erweiterte Realität},
year = {2006},
pages = {193--201}
}
|
| Müller, K., Reusche, L. & Fellner, D.W., (2006), "Extended Subdivision Surfaces: Building a bridge between NURBS and Catmull-Clark Surfaces", ACM Transactions on Graphics, Vol.25(2), pp.268-292. |
BibTeX:
@article{Mueller*05tog,
author = {Kerstin Müller and Lars Reusche and Dieter W. Fellner},
title = {Extended Subdivision Surfaces: Building a bridge between NURBS and Catmull-Clark Surfaces},
journal = {ACM Transactions on Graphics},
year = {2006},
volume = {25},
number = {2},
pages = {268-292},
doi = {http://dx.doi.org/10.1145/1138450.1138455}
}
|
| Posch, K.-C. & Fellner, D., (2006), "Schwerpunktbildung rechnet sich: Informatik an der TU Graz führt österreichischen IT-Wettbewerb an", Forschungsjournal der Technischen Universität Graz, Vol.SS06, pp.17. |
BibTeX:
@article{Posch-Fellner06,
author = {K.-C. Posch and D. Fellner},
title = {Schwerpunktbildung rechnet sich: Informatik an der TU Graz führt österreichischen IT-Wettbewerb an},
journal = {Forschungsjournal der Technischen Universität Graz},
year = {2006},
volume = {SS06},
pages = {17}
}
|
2005 |
| Berndt, R., Fellner, D.W. & Havemann, S., (2005), "Generative 3D Models: A Key to More Information within Less Bandwidth at Higher Quality", Proc. Web3D 2005 Intl. Symp., pp.111-122, ACM Siggraph.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: This paper proposes a novel, yet extremely compact shape representation method. Its main feature is that 3D shapes are represented in terms of functions instead of geometric primitives. Given a set of -- typically only a few -- specific parameters, the evaluation of such a function results in a model that is one instance of a general shape. Particularly important for the web context with client systems of widely varying rendering performance is the support of a semantic level-of-detail superior to any low-level polygon reduction scheme. The shape description language has the power of a full programming language, but it has an extremely simple syntax. It serves as a 'mesh creation/manipulation language'. It is designed to facilitate the composition of more complex modeling operations out of simpler ones. Thus, it allows to create high-level operators which evaluate to arbitrarily complex, parameterized shapes. The underlying low-level shape representation is a boundary representation mesh in combination with Catmull/Clark subdivision surfaces. |
BibTeX:
@inproceedings{Berndt*05web3d,
author = {Berndt, Rene and Fellner, Dieter W. and Havemann, Sven},
title = {Generative 3D Models: A Key to More Information within Less Bandwidth at Higher Quality},
booktitle = {Proc. Web3D 2005 Intl. Symp.},
publisher = {ACM Siggraph},
year = {2005},
pages = {111-122},
doi = {http://dx.doi.org/10.1145/1050491.1050508}
}
|
| Gerth, B., Berndt, R., Havemann, S. & Fellner, D.W., (2005), "3D Modeling for Non-Expert Users with the Castle Construction Kit v0.5", Proc. VAST 2005 Intl. Symp., pp.49-57, Eurographics.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: We present first results of a system for the ergonomic and economic production of three-dimensional interactive illustrations by non-expert users like average CH professionals. For this purpose we enter the realm of domaindependent interactive modeling tools, in this case exemplified with the domain of medieval castles. Special emphasis is laid on creating generic modeling tools that increase the usability with a unified 3D user interface, as well as the efficiency of tool generation. On the technical level our system innovates by combining two powerful but previously separate approaches, the Generative Modeling Language (GML) and the OpenSG scene graph engine. |
BibTeX:
@inproceedings{Gerth*05vast,
author = {Gerth, Björn and Berndt, René and Havemann, Sven and Fellner, Dieter W.},
title = {3D Modeling for Non-Expert Users with the Castle Construction Kit v0.5},
booktitle = {Proc. VAST 2005 Intl. Symp.},
publisher = {Eurographics},
year = {2005},
pages = {49-57},
doi = {http://dx.doi.org/10.2312/VAST/VAST05/049-057}
}
|
| Halm, A., Offen, L. & Fellner, D., (2005), "BioBrowser: A Framework for Fast Protein Visualization", Proc. EUROGRAPHICS -- IEEE VGTC Symposium on Visualization, pp.287-294, Eurographics.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: This paper presents a protein visualization system called BioBrowser, which provides high quality images at interactive frame rates for molecules of extreme size and complexity. This is achieved by a shift in the tessellation approach: triangle meshes are not produced a priori on a 'just-in-case' basis. Instead, tessellation happens 'justin- time' given a certain camera position, image size and interaction demand. Thus, our approach is based on multiresolution meshes and on new extensions of graphics hardware. The paper shows how to reduce geometric data by using subdivision surfaces for ribbon structures and molecular surfaces and by using billboards instead of spheres consisting of triangles. It also shows how to use fragment shaders to create a three dimensional appearance and realistic sphere intersections. The combination of these approaches leads to an image quality not yet seen in interactive visualization environments for molecules of that size/complexity. All the above methods are combined to gain a high performance configurable visualization system on standard hardware. |
BibTeX:
@inproceedings{Halm*05eurovis,
author = {Halm, A. and Offen, L. and Fellner, D.},
title = {BioBrowser: A Framework for Fast Protein Visualization},
booktitle = {Proc. EUROGRAPHICS -- IEEE VGTC Symposium on Visualization},
publisher = {Eurographics},
year = {2005},
pages = {287-294},
doi = {http://dx.doi.org/10.2312/VisSym/EuroVis05/287-294}
}
|
| Havemann, S. & Fellner, D.W., Tochtermann, K. & Maurer, H. (ed.) (2005), "Managing Procedural Knowledge", Proc. 5th International Conference on Knowledge Management (I-KNOW'05), pp.248-255, Springer.
[Abstract] [BibTeX] [PDF] |
| Abstract: Procedural knowledge is one of the most valuable assets of individuals as well as academic institutions and commercial companies. The ability to satisfy an order relies on the knowledge how similar tasks have been performed in the past. Thus the preservation of this knowledge is critical. Procedural knowledge takes many different forms, which makes it very hard to reason about it. We propose a method to reduce it to its very essence. This method is very simple, and as such it is not new. But we argue that it is worthwhile to take a fresh look on an existing technology from a new point of view, because it may solve the problem of knowledge preservation that has become apparent in this form only recently. Although the technique is known for a long time, it appears that its potential for the management of procedural knowledge has not been realized so far. It is a also very elegant method since we can show that it serves both as a theoretical device to better understand the nature of processes, but it can also be directly operationalized to derive a new generation of user-friendly tools that support the preservation of procedural knowledge. |
BibTeX:
@inproceedings{Havemann-Fellner05iknow,
author = {Havemann, Sven and Fellner, Dieter W.},
editor = {K. Tochtermann and H. Maurer},
title = {Managing Procedural Knowledge},
booktitle = {Proc. 5th International Conference on Knowledge Management (I-KNOW'05)},
publisher = {Springer},
year = {2005},
pages = {248-255}
}
|
| Havemann, S., (2005), "Generative Mesh Modeling". |
BibTeX:
@phdthesis{Havemann05:PhD,
author = {Sven Havemann},
title = {Generative Mesh Modeling},
school = {Institute of Computer Graphics, Faculty of Computer Science, Braunschweig Technical University, Germany},
year = {2005},
note = {available from www.digibib.tu-bs.de/?docid=00000008}
}
|
| Kim, H., Albuquerque, G., Havemann, S. & Fellner, D.W., (2005), "Tangible 3D: Hand Gesture Interaction for Immersive 3D Modeling", Proc. Virtual Environments 2005, pp.191-199, Eurographics.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Most of all interaction tasks relevant for a general three-dimensional virtual environment can be supported by 6DOF control and grab/select input. Obviously a very efficient method is direct manipulation with bare hands, like in real environment. This paper shows the possibility to perform non-trivial tasks using only a few well-known hand gestures, so that almost no training is necessary to interact with 3D-softwares. Using this gesture interaction we have built an immersive 3D modeling system with 3D model representation based on a mesh library, which is optimized not only for real-time rendering but also accommodates for changes of both vertex positions and mesh connectivity in real-time. For performing the gesture interaction, the user's hand is marked with just four fingertipthimbles made of inexpensive material as simple as white paper. Within our scenario, the recognized hand gestures are used to select, create, manipulate and deform the meshes in a spontaneous and intuitive way. All modeling tasks are performed wirelessly through a camera/vision tracking method for the head and hand interaction. |
BibTeX:
@inproceedings{Kim*05egve,
author = {Kim, Hyosun and Albuquerque, Georgia and Havemann, Sven and Fellner, Dieter W.},
title = {Tangible 3D: Hand Gesture Interaction for Immersive 3D Modeling},
booktitle = {Proc. Virtual Environments 2005},
publisher = {Eurographics},
year = {2005},
pages = {191-199},
doi = {http://dx.doi.org/10.2312/EGVE/IPT_EGVE2005/191-199}
}
|
| Sabin, M.A., Augsdörfer, U.H. & Dodgson, N.A., (2005), "Artifacts in Box-Spline Surfaces", Mathematics of Surfaces XI, Vol.3604, pp.350-363, Springer.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: Certain problems in subdivision surfaces have provided the incentive to look at artifacts. Some of these effects are common to all box-spline surfaces, including the tensor product B-splines widely used in the form of NURBS, and these are worthy of study. Although we use the subdivision form of box- and B-splines as the mechanism for this study, and also apply the same mechanism to the subdivision schemes which are not box-splines, we are looking at problems which are not specific to subdivision surfaces, but which afflict all Box- and B-splines. |
BibTeX:
@inproceedings{Malcolm*05lncs,
author = {Malcolm A. Sabin and Ursula H. Augsdörfer and Neil A. Dodgson},
title = {Artifacts in Box-Spline Surfaces},
booktitle = {Mathematics of Surfaces XI},
publisher = {Springer},
year = {2005},
volume = {3604},
pages = {350-363},
doi = {http://dx.doi.org/10.1007/11537908_21}
}
|
| Ullrich, T. & Fellner, D.W., (2005), "Computer Graphics Courseware", Eurographics 2005 -- Education Papers, pp.11-17, Eurographics Association.
[Abstract] [BibTeX] [DOI] [PDF] |
| Abstract: A lot of courseware tools suffer from the almost mutually exclusive goals of ease of usability on the one hand and extensibility and flexibility on the other hand. In most cases the tools are either ready-to-use applications (e.g. a virtual lab) or complex tool sets which need a long period of domain-specific adjustment. This paper presents the courseware environment AlgoViz which primarily addresses this problem. The AlgoViz project provides a software collection which is currently focused on the visualization of fundamental computer graphics algorithms and geometric modeling concepts. The intention is to build a collection of components, that can easily be combined to new applications. Supporting a purely visual programming paradigm, AlgoViz offers the possibility to create new demonstration applications without having to write a single line of source code. To demonstrate its potential AlgoViz comes with a variety of examples already forming a valuable computer graphics tutorial. |
BibTeX:
@inproceedings{Ullrich-Fellner05eg,
author = {Ullrich, T. and Fellner, Dieter W.},
title = {Computer Graphics Courseware},
booktitle = {Eurographics 2005 -- Education Papers},
publisher = {Eurographics Association},
year = {2005},
pages = {11-17},
doi = {http://dx.doi.org/10.2312/Conf/EG2005/Education/011-017}
}
|
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