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Conference on computer Vision and Pattern Recognition (CVPR)

作者： Wai-Shun Tong Chi-Keung Tang Vision and Graphics Group Computer Science Department Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)0769519008

A "graphics for vision" approach is proposed to address the problem of reconstruction from a large and imperfect data set: reconstruction on demand by tensor voting, or ROD-TV. ROD-TV simultaneously delivers good efficiency and robustness, by adapting to a continuum of primitive connectivity, view dependence, and levels of detail (LOD). Locally inferred surface elements are robust to noise and better capture local shapes. By inferring per-vertex normals at sub-voxel precision on the fly, we can achieve interpolative shading. Since these missing details can be recovered at the current level of detail, our result is not upper bounded by the scanning resolution. By relaxing the mesh connectivity requirement, we extend ROD-TV and propose a simple but effective multiscale feature extraction algorithm. ROD-TV consists of a hierarchical data structure that encodes different levels of detail. The local reconstruction algorithm is tensor voting. It is applied on demand to the visible subset of data at a desired level of detail, by traversing the data hierarchy and collecting tensorial support in a neighborhood. We compare our approach and present encouraging results.

关键词： Tensile stress Voting Noise robustness graphics Surface reconstruction Noise shaping Shape Feature extraction Data structures Reconstruction algorithms

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Hardware assisted multichannel volume rendering

Hardware assisted multichannel volume rendering

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computer graphics International

作者： Abhijeet Ghosh Poojan Prabhu A.E. Kaufman K. Mueller Center for Visual Computing and Computer Science Department Stony Brook University Stony Brook NY USA Fraunhofer-Institute of Computer Graphics Germany

We explore real time volume rendering of multichannel data for volumes with color and multimodal information. We demonstrate volume rendering of the visible human male color dataset and photorealistic rendering of voxelized terrains, and achieve high quality visualizations. We render multimodal volumes utilizing hardware programmability for accumulation level mixing, and use CT and MRI information as examples. We also use multiboard parallel/distributed rendering schemes for large datasets and investigate scalability issues. We employ the VolumePro 1000 for real time multichannel volume rendering. Our approach, however, is not hardware-specific and can use commodity texture hardware instead.

关键词： Hardware Rendering (computer graphics) computer graphics Humans Data visualization Computed tomography Magnetic resonance imaging Biomedical imaging Satellites Terrain mapping

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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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The design and evaluation of a pipelined image compositing device for massively parallel volume rendering 03

The design and evaluation of a pipelined image compositing d...

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2003 Eurographics/IEEE TVCG Workshop on Volume graphics, VG '03

作者： Ogata, Masato Muraki, Shigeru Liu, Xuezhen Ma, Kwan-Liu Research and Development Department Mitsubishi Precision Co. Ltd. Kamakura Kanagawa Japan Collaborative Research Team of Volume Graphics National Institute of Advanced Industrial Science and Technology Tokyo Japan Department of Computer Science University of California Davis CA United States 345 Kamimachiya Kamakura Kanagawa 247-8505 Japan 2-41-6 Aomi Koto-ku Tokyo 135-0064 Japan One Shields Avenue Davis CA 95616-8562 United States

ISBN: (纸本)1581137451

An experimental study of software image compositing that we have carried out on a 512-node PC cluster shows the necessity of hardware compositing support to make possible real-time volume visualization scalable with large PC clusters. This paper describes the design and performance evaluation of such a hardware image compositing device. A PC cluster using such devices along with commodity graphics cards can enable simultaneous simulation and volume visualization. © The Eurographics Association 2003.

关键词： Volume rendering

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Erratum: Adding support for high-level skeletal animation (IEEE Transactions on Visualization and computer graphics (October-December 2002) 8:4 (110))

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IEEE Transactions on Visualization and computer graphics 2003年第1期9卷 110-110页

作者： Seron, Francisco J. Rodriguez, Rafael Cerezo, Eva Pina, Alfredo Advanced Computer Graphics Group Technical School of Engineering University of Zaragoza C/Maria de Luna 1 E-50015 Zaragoza Spain Brainstorm Multimedia Valencia Spain Math./Computer Science Department Public University of Navarra Campus de Arrosadia s/n E-31006 Pamplona Spain

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Sort-first, distributed memory parallel visualization and rendering

Sort-first, distributed memory parallel visualization and re...

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IEEE Symposium on Parallel and Large-Data Visualization and graphics (PVG)

作者： E.W. Bethel G. Humphreys B. Paul J.D. Brederson Lawrence Berkeley National Laboratory Berkeley CA USA Department of Computer Science University of Virginia Charlottesville VA USA Tungsten Graphics Inc. Cedar Park TX USA Scientific Computing and Imaging Institute University of Utah Salt Lake UT USA

While commodity computing and graphics hardware has increased in capacity and dropped in cost, it is still quite difficult to make effective use of such systems for general-purpose parallel visualization and graphics. We describe the results of a recent project that provides a software infrastructure suitable for general-purpose use by parallel visualization and graphics applications. Our work combines and extends two technologies: chromium, a stream-oriented framework that implements the OpenGL programming interface; and OpenRM scene graph, a pipelined-parallel scene graph interface for graphics data management. Using this combination, we implement a sort-first, distributed memory, parallel volume rendering application. We describe the performance characteristics in terms of bandwidth requirements and highlight key algorithmic considerations needed to implement the sort-first system. We characterize system performance using a distributed memory parallel volume rendering application, and present performance gains realized by using scene specific knowledge to accelerate rendering by reducing network traffic. The contribution of this work is an exploration of general-purpose, sort-first architecture performance characteristics as applied to distributed memory, commodity hardware, along with a description of the algorithmic support needed to realize parallel, sort-first implementations.

关键词： graphics Rendering (computer graphics) Layout Hardware Concurrent computing Costs Data visualization Application software Chromium Technology management

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The design and evaluation of a pipelined image compositing device for massively parallel volume rendering

The design and evaluation of a pipelined image compositing d...

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Volume graphics 2003, Third Intenational Workshop on Volume graphics

作者： Ogata, Masato Muraki, Shigeru Liu, Xuezhen Ma, Kwan-Liu Research and Development Department Mitsubishi Precision Co. Ltd. Kamakura Kanagawa Japan Collab. Res. Team of Vol. Graphics Natl. Inst. Adv. Indust. Sci./T. Tokyo Japan Department of Computer Science University of California Davis CA United States 345 Kamimachiya Kamakura Kanagawa 247-8505 Japan 2-41-6 Aomi Koto-ku Tokyo 135-0064 Japan One Shields Avenue Davis CA 95616-8562 United States

ISBN: (纸本)1581137451

关键词： computer graphics

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Using Perceptual Texture Masking for Efficient Image Synthesis

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computer graphics Forum 2003年第3期21卷

作者： Bruce Walter Sumanta N. Pattanaik Donald P. Greenberg Cornell University † Program of Computer Graphics 580 Rhodes Hall Cornell University Ithaca NY 14853 USA † University of Central Florida SEECS Department of Computer Science Room 250 Orlando FL 32816-2362 USA University of Central Florida

Texture mapping has become indispensable in image synthesis as an inexpensive source of rich visual detail. Less obvious, but just as useful, is its ability to mask image errors due to inaccuracies in geometry or lighting. This ability can be used to substantially accelerate rendering by eliminating computations when the resulting errors will be perceptually insignificant. Our new method precomputes the masking ability of textures using aspects of the JPEG image compression standard. This extra information is stored as threshold elevation factors in the texture's mip-map and interpolated at image generation time as part of the normal texture lookup process. Any algorithm which uses error tolerances or visibility thresholds can then take advantage of texture masking. Applications to adaptive shadow testing, irradiance caching, and path tracing are demonstrated. Unlike prior methods, our approach does not require that initial images be computed before masking can be exploited and incurs only negligible runtime computational overhead. Thus, it is much easier to integrate with existing rendering systems for both static and dynamic scenes and yields computational savings even when only small amounts of texture masking are present. Categories and Subject Descriptors (according to ACM CCS): I.3.7 [computer graphics]: Color, shading, shadowing, and texture

关键词： Visual Perception Perceptual Rendering Texture Mapping JPEG

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Efficient bounded adaptive tessellation of displacement maps

Efficient bounded adaptive tessellation of displacement maps

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Graphic Interface 2002

作者： Moule, Kevin McCool, Michael D. Computer Graphics Lab Department of Computer Science University of Waterloo Waterloo Ont. Canada

Displacement mapping is a technique for applying fine geometric detail to a simpler base surface. The displacement is often specified as a scalar function which makes it relatively easy to increase visual complexity without the difficulties inherent in more general modeling techniques. We would like to use displacement mapping in real-time applications. Ideally, a graphics accelerator should create a polygonal tessellation of the displaced surface on the fly to avoid storage and host bandwidth overheads. We present an online, adaptive, crack-free tessellation scheme for real-time displacement mapping that uses only local information for each triangle to perform a view-dependent tessellation. The tessellation works in homogeneous coordinates and avoids re-transformation of displaced points, making it suitable for high-performance hardware implementation. The use of interval analysis produces meshes with good error bounds that converge quickly to the true surface.

关键词： computer graphics

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