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6th Joint Eurographics - IEEE TCVG Symposium on Visualization, VisSym 2004

作者： Schlechtweg, Stefan Schulze-Wollgast, Petra Schumann, Heidrun Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Universitätsplatz 2 MagdeburgD-39106 Germany Institute of Computer Science University of Rostock Albert-Einstein-Straße 21 RostockD-18055 Germany

ISBN: (纸本)390567307X

This paper addresses the issue of how information visualization techniques can be used to assist full-text search in electronic documents. Our approach supports multiple term queries with interactive treemaps. We use a treemap to visualize the basic structure of the document and exploit color coding to show the distribution of query terms on various levels of the hierarchy. Furthermore, we include filtering techniques to concentrate on those parts of the structure that actually contain the requested information, and, finally provide interactive tools to give access to detailed information whenever the user wishes. © The Eurographics Association 2004.

关键词： Information systems

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Smart 3D visualizations in clinical applications

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3rd International Symposium on Smart graphics, SG 2003

作者： Preim, Bernhard Peitgen, Heinz-Otto Institute for Simulation and Graphics Department for Computer Science Otto-von-Guericke-University of Magdeburg Universitaetsplatz 2 Magdeburg39106 Germany Center for Medical Diagnosic Systems and Visualization Universitaetsallee 29 Bremen28359 Germany

ISBN: (纸本)3540405577

We discuss techniques for the visualization of medical volume data dedicated for their clinical use. We describe the need for rapid dynamic interaction facilities with such visualizations and discuss emphasis techniques in more detail. Another crucial aspect of medical visualization is the integration of 2d and 3d visualizations. In order to organize this discussion, we introduce 6 „Golden"rules for medical visualizations. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Visualization

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A comparison of Gaussian and mean curvatures estimation methods on triangular meshes

A comparison of Gaussian and mean curvatures estimation meth...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： T. Surazhsky E. Magid O. Soldea G. Elber E. Rivlin Center for Graphics and Geometric Computing Israel Institute of Technology Haifa Israel Applied Mathematics Department Faculty of Computer Science

Estimating intrinsic geometric properties of a surface from a polygonal mesh obtained from range data is an important stage of numerous algorithms in computer and robot vision, computer graphics, geometric modeling, industrial and biomedical engineering. This work considers different computational schemes for local estimation of intrinsic curvature geometric properties. Five different algorithms and their modifications were tested on triangular meshes that represent tessellations of synthetic geometric models. The results were compared with the analytically computed values of the Gaussian and mean curvatures of the non-uniform rational B-spline (NURBs) surfaces, these meshes originated from. This work manifests the best algorithms suited for that indeed different algorithms should be employed to compute the Gaussian and mean curvatures.

关键词： Biomedical computing Solid modeling Spline computer vision Service robots Robot vision systems computer graphics computer industry Biomedical engineering Testing

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Metamorphosis of planar parametric curves via curvature interpolation

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International Journal of Shape Modeling 2002年第2期8卷 201-216页

作者： Surazhsky, Tatiana Elber, Gershon Ctr. Graphics Geometric Computing Applied Mathematics Dept. Technion Israel Institute of Technology Haifa 32000 Israel Ctr. Graphics Geometric Computing Faculty of Computer Science Technion Israel Institute of Technology Haifa 32000 Israel

This work considers the problem of metamorphosis interpolation between two freeform planar curves. Given two planar parametric curves, the curvature signature of the two curves is linearly blended, yielding a gradual change that is not only smooth but also employs intrinsic curvature shape properties, and hence is highly appealing. In order to be able to employ this curvature blending, we present a constructive scheme to derive curvature signatures of parameter curves. Additionally, we propose a scheme to reconstruct a curve from its curvature signature.

关键词： Computational geometry

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Efficient compression and rendering of multi-resolution meshes 02

Efficient compression and rendering of multi-resolution mesh...

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Proceedings of the conference on Visualization '02

作者： Zachi Karni Alexander Bogomjakov Craig Gotsman Center for Graphics and Geometric Computing The Faculty of Computer Science Technion -- Israel Institute of Technology

ISBN: (纸本)9780780374980

We present a method to code the multiresolution structure of a 3D triangle mesh in a manner that allows progressive decoding and efficient rendering at a client machine. The code is based on a special ordering of the mesh vertices which has good locality and continuity properties, inducing a natural multiresolution structure. This ordering also incorporates information allowing efficient rendering of the mesh at all resolutions using the contemporary vertex buffer mechanism. The performance of our code is shown to be competitive with existing progressive mesh compression methods, while achieving superior rendering speed.

关键词： rendering wavelets geometry coding progressive compression

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Efficient compression and rendering of multi-resolution meshes

Efficient compression and rendering of multi-resolution mesh...

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IEEE Conference on Visualization

作者： Z. Karni A. Bogomjakov C. Gotsman Center for Graphics and Geometric Computing The Faculty of Computer Science Technion-Israel Institute of Technology Israel

关键词： Rendering (computer graphics) Geometry Decoding Solid modeling Multiresolution analysis computer graphics computer science Internet Web server Rough surfaces

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Mobile robot localization under varying illumination

Mobile robot localization under varying illumination

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作者： Jogan, Matjaž Leonardis, Aleš Wildenauer, Horst Bischof, Horst Faculty of Computer and Information Science University of Ljubljana Tržaška 25 1001 Ljubljana Slovenia Pattern Recognition and Image Processing Group Institute for Computer Aided Automation Vienna University of Technology Favoritenstrasse 9/1832 A-1040 Vienna Austria Institute for Computer Graphics and Vision Graz University of Technology Inffeldgasse 16 2. OG A-8010 Graz Austria

Methods for mobile robot localization that use eigenspaces of panoramic snapshots of the environment are in general sensitive to changes in the illumination of the environment. Therefore, we propose an approach which achieves a reliable localization under severe illumination conditions. The method uses gradient filtering of the eigenspace. After testing the approach on images obtained by a mobile robot, we show that it outperforms the standard eigenspace-based recognition method. © 2002 IEEE.

关键词： Mobile robots

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Mobile robot localization under varying illumination

Mobile robot localization under varying illumination

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16th International Conference on Pattern Recognition, ICPR 2002

作者： Jogan, Matjaž Leonardis, Aleš Wildenauer, Horst Bischof, Horst Faculty of Computer and Information Science University of Ljubljana Tržaška 25 Ljubljana1001 Slovenia Pattern Recognition and Image Processing Group Institute for Computer Aided Automation Vienna University of Technology Favoritenstrasse 9/1832 ViennaA-1040 Austria Institute for Computer Graphics and Vision Graz University of Technology Inffeldgasse 16 2. OG GrazA-8010 Austria

ISBN: (纸本)0769516963

Methods for mobile robot localization that use eigen spaces of panoramic snapshots of the environment are in general sensitive to changes in the illumination of the environment. Therefore, we propose an approach which achieves a reliable localization under severe illumination conditions. The method uses gradient filtering of the eigen space. After testing the approach on images obtained by a mobile robot, we show that it outperforms the standard eigen space-based recognition method. © 2002 IEEE.

关键词： Mobile robots

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Mobile robot localization under varying illumination

Mobile robot localization under varying illumination

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International Conference on Pattern Recognition

作者： M. Jogan A. Leonardis H. Wildenauer H. Bischof Faculty of Computer and Information Science University of Ljubljana Ljubljana Slovenia Pattern Recognition and Image Processing Group Institute for Computer Aided Automation University of Technology Vienna Vienna Austria Institute for Computer Graphics and Vision Graz University of Technology Graz Austria

关键词： Mobile robots Lighting computer vision Filter bank Image recognition Indoor environments Pattern recognition Image processing computer graphics Information science

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Assessment of simulation models based on trace-file analysis: a metamodeling approach

Assessment of simulation models based on trace-file analysis...

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simulation Winter Conference

作者： J. Tolujev P. Lorenz D. Beier T.J. Schriber Faculty of Automation and Computing Techniques Dept of Modeling and Simulation Riga Technical University Riga Latvia Faculty of Computer Science Institute for Simulation and Graphics University of Magdeburg Magdeburg Germany Michigan Business School Computer and Information Systems University of Michigan Ann Arbor MI USA

Many important characteristics of simulation models, including queuing models, can be investigated by the use of metamodels. Problems in qualitative analysis such as analyzing model dynamics and coming to a careful understanding of model behavior can be dealt with this way. Metamodels can provide precise results even for quantitative analysis tasks, such as those involving the movement of dynamic model elements. This paper describes the use of a type of metamodeling to support the assessment of simulation models based on the analysis of trace files produced at the time of model execution. Because of the simple structure of these trace files, a simulation model can create them easily. The analysis and interpretation of trace files that is described here is independent of the simulation language used to create the original model. The tools presented in this article can be used for these purposes: to construct generic model structures at the metamodel level and then animate aspects of model behavior in terms of these structures; to build a graphic display indicating which dynamic model elements moved at which times between which points in the model, and in which real-time order in cases of time ties; to determine when (and if) user-specified model conditions come about; and to develop statistical information that might not have been planned for in the design of the original model. Future plans call for making these tools available in a World Wide Web environment to support assessment of simulation models.

关键词： Analytical models Metamodeling Computational modeling computer simulation Automation computer science Information systems computer graphics Animation Displays

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