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检索条件"机构=Computer Graphics and Visualization Department"

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A graduate level course on real-time medical graphics 07

A graduate level course on real-time medical graphics

引用

ACM SIGGRAPH 2007: Educators Program, SIGGRAPH 2007

作者： Domik, Gitta Department of Computer Graphics Visualization and Image Processing University of Paderborn Germany

ISBN: (纸本)9781450318303

The need for courses on medical graphics, especially in real-time volume graphics, has increased. In order for students to develop skills sufficient to work on independent studies, or Bachelor's or Master's Theses, they will need 3 courses on computer graphics: course I teaches basic computer graphics according to the rendering pipeline;course II extends into advanced rendering and modeling algorithms and lays the foundation for computer-generated visualization;course III can then use these foundations to extend into medical graphics.

关键词： Students

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Implicit surface modeling suitable for inside/outside tests with radial basis functions

Implicit surface modeling suitable for inside/outside tests ...

引用

2007 10th IEEE International Conference on computer Aided Design and computer graphics, CAD/graphics 2007

作者： Pan, Rongjiang Skala, Vaclav School of Computer Science and Technology Shandong University Jinan 250100 China Centre of Computer Graphics and Data Visualization Department of Computer Science and Engineering University of West Bohemia Plzen 306 14 Czech Republic

ISBN: (纸本)9781424415793

We describe a method for computing an implicit function that represents a surface by its zero level set, given a set of points scattered over the surface and associated with surface normal vectors. This implicit function is defined as a linear combination of compactly supported radial basis functions. Our method is suitable for testing whether a given point is interior or exterior to the surface, previously only associated with globally supported or globally regularized radial basis functions. We use a two-level interpolation approach. In the coarse scale interpolation, we set basis function centers by a grid that covers the enlarged bounding box of the given point set and compute their signed distances to the underlying surface using local quadratic approximations of the nearest surface points. Then a fitting to the residual errors on the surface points and additional off-surface points is performed with fine scale basis functions. The final function is the sum of the two intermediate functions and is a good approximation of the signed distance field to the surface in the bounding box. Examples of surface reconstruction and set operations between shapes are provided. © 2007 IEEE.

关键词： Interpolation

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1 Course description

1 Course description

引用

ACM SIGGRAPH 2007 - International Conference on computer graphics and Interactive Techniques

作者： Kasik, Dave Gobbetti, Enrico Marton, Fabio Manocha, Dinesh Yoon, Sung-Eui Correa, Wagner Bruderlin, Beat Stephens, Abe Slusallek, Philipp Dietrich, Andreas Quilez, Iñigo Boeing Enterprise Visualization China Italy Department of Computer Science University of North Carolina Chapel Hill United States Lawrence Livermore National Laboratory United States Visualization Systems Group United States United States Department of Computer Science Technical University of Ilmenau Germany University of Utah's SCI Institute United States Department of Computer Graphics and Digital Media Saarland University Germany Computer Graphics Group Saarland University Germany

No abstract available

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Feature Emphasis and Contextual Cutaways for Multimodal Medical visualization

Feature Emphasis and Contextual Cutaways for Multimodal Medi...

引用

9th Joint Eurographics/IEEE VGTC Symposium on visualization, EuroVis 2007

作者： Burns, Michael Haidacher, Martin Wein, Wolfgang Viola, Ivan Gröller, M. Eduard Imaging and Visualization Department Siemens Corporate Research PrincetonNJ United States Computer Science Department Princeton University United States Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Department of Informatics University of Bergen Norway

ISBN: (纸本)9783905673456

Dense clinical data like 3D Computed Tomography (CT) scans can be visualized together with real-time imaging for a number of medical intervention applications. However, it is difficult to provide a fused visualization that allows sufficient spatial perception of the anatomy of interest, as derived from the rich pre-operative scan, while not occluding the real-time image displayed embedded within the volume. We propose an importance-driven approach that presents the embedded data such that it is clearly visible along with its spatial relation to the surrounding volumetric material. To support this, we present and integrate novel techniques for importance specification, feature emphasis, and contextual cutaway generation. We show results in a clinical context where a pre-operative CT scan is visualized alongside a tracked ultrasound image, such that the important vasculature is depicted between the viewpoint and the ultrasound image, while a more opaque representation of the anatomy is exposed in the surrounding area. © The Eurographics Association 2007.

关键词： visualization

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Implicit Surface Modeling Suitable for Inside/Outside Tests with Radial Basis Functions

Implicit Surface Modeling Suitable for Inside/Outside Tests ...

引用

2007 10th IEEE International Conferences on computer Aided Design and computer graphics(CAD/graphics 2007)

作者： Vaclav Skala Centre of Computer Graphics and Data Visualization Department of Computer Science and EngineeringUniversity of West BohemiaPlzenCzech Republic30614

We describe a method for computing an implicit function that represents a surface by its zero level set,given a set of points scattered over the surface and associated with surface normal *** implicit function is defined as a linear combination of compactly supported radial basis *** method is suitable for testing whether a given point is interior or exterior to the surface,previously only associated with globally supported or globally regularized radial basis *** use a two-level interpolation *** the coarse scale interpolation,we set basis function centers by a grid that covers the enlarged bounding box of the given point set and compute their signed distances to the underlying surface using local quadratic approximations of the nearest surface *** a fitting to the residual errors on the surface points and additional off-surface points is performed with fine scale basis *** final function is the sum of the two intermediate functions and is a good approximation of the signed distance field to the surface in the bounding *** of surface reconstruction and set operations between shapes are provided.

关键词： Implicit Surface Modeling Suitable for Inside/Outside Tests with Radial Basis Functions

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Implicit Surface Modeling Suitable for Inside/Outside Tests with Radial Basis Functions

Implicit Surface Modeling Suitable for Inside/Outside Tests ...

引用

IEEE International Conference on computer-Aided Design and computer graphics

作者： Rongjiang Pan Vaclav Skala School of Computer Science and Technology Shandong University Jinan China Centre of Computer Graphics and Data Visualization Department of Computer Science and Engineering University of West Bohemia Plzen Czech Republic

关键词： Testing Surface fitting Surface reconstruction computer science Interpolation computer graphics Data visualization Data engineering Level set Scattering

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Precise Registration of 3D Models To Images by Swarming Particles

Precise Registration of 3D Models To Images by Swarming Part...

引用

Conference on computer Vision and Pattern Recognition (CVPR)

作者： Joerg Liebelt Klaus Schertler Computer Graphics & Visualization Group Technical University Munich Munich Germany Department IW-SI EADS Innovation Works Germany Munich Germany

The precise alignment of a 3D model to 2D sensor images to recover the pose of an object in a scene is an important topic in computer vision. In this work, we outline a registration scheme to align arbitrary standard 3D models to optical and synthetic aperture radar (SAR) images in order to recover the full 6 degrees of freedom of the object. We propose a novel similarity measure which combines perspective contour matching and an appearance-based Mutual information (MI) measure. Unlike previous work, the resulting similarity measure is optimized using an evolutionary particle swarming strategy, parallelized to exploit the hardware acceleration potential of current generation graphics processors (GPUs). The performance of our registration scheme is systematically evaluated on an object tracking task using synthetic as well as real input images. We show that our approach leads to precise registration results, even for significant image noise, small object dimensions and partial occlusion where other methods would fail.

关键词： Image sensors Layout computer vision Adaptive optics Laser radar Optical sensors Synthetic aperture radar Mutual information Current measurement Particle measurements

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A Hybrid Approach for a Real-time Haptic and Graphic Simulator in Virtual Environment

A Hybrid Approach for a Real-time Haptic and Graphic Simulat...

引用

IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： Sang-Youn Kim Segil Park Dong-Soo Kwon Jinah Park Interactive Virtual Reality Laboratory Korea University of Technology and Education Cheonan South Korea School of Engineering ICU Computer Graphics and Visualization Laboratory Daejeon South Korea Department of Mechanical Engineering Telerobotics & Control Laboratory KAIST Daejeon South Korea

In interacting with a soft object, both visual and haptic senses play major role in providing the characteristics of the object. While visual feedback comes from the appearance of the overall shape, haptic feedback comes largely from the localized internal composition. However, it has been a common practice to represent the object with one model for both processing shape de formation and computing the feedback force, making it much challenging work to achieve real-time simulation of a soft and especially non-homogeneous object. In this paper, we claim that it may be sufficient to represent the graphical visual model as a surface model whereas it is necessary to represent the haptic model as a volumetric model. We propose, therefore, a hybrid model where volumetric haptic model and surface graphical model coexist. For constructing hybrid model, we employ S-chain model to compute the haptic behavior and mass-spring model to calculate graphic behavior. We conduct experiments with volumetric human liver model at a haptic update rate of 1000 Hz and graphic update rate of 30 Hz. The experimental results show that our proposed model satisfies the real-time performance and provides the realistic sense to be useful for a virtual reality application.

关键词： Haptic interfaces graphics Virtual environment Shape Force feedback Computational modeling Graphical models Humans Liver Virtual reality

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Development and implementation of rear projection algorithm based on high-end graphics accelerator

Development and implementation of rear projection algorithm ...

引用

16th International Conference on computer graphics and Vision, GraphiCon 2006

作者： Kovalkov, Max Rukhlinsky, Alexey V. Tarancev, Igor G. Department of Physics Novosibirsk State University Russia Laboratory of Synthesizing Visualization Systems IAE Russia Laboratory Computer Graphics IAE Russia

The algorithm of rear projection of noisy image is considered. Different types of filtration for suppression of noise are observed. Quantitative assessment of speed of the software implementation of the proposed algor... 详细信息

关键词： Image filtration Rear projection

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Punctuated simplification of man-made objects

Punctuated simplification of man-made objects

引用

作者： Jang, Justin Wonka, Peter Ribarsky, William Shaw, Christopher D. Georgia Institute of Technology GVU Center College of Computing Atlanta GA 30332 United States Arizona State University PRISM Dept. of Computer Science and Engineering Tempe AZ 85287 United States UNC Charlotte CS Dept. Charlotte Visualization Center Charlotte NC 28223 United States Simon Fraser University Surrey School of Interactive Arts and Technology 14-660 Central City Tower 13450 102 Ave Surrey BC V3T 5X3 Canada Graphics Visualization and Usability Center Georgia Institute of Technology PRISM Lab. ASU Department of Information Technology UNC Charlotte Charlotte Visualization Center IEEE Visualization and Graphics Technical Committee School of Interactive Arts and Technology Simon Fraser University Surrey

We present a simplification algorithm for manifold polygonal meshes of plane-dominant models. Models of this type are likely to appear in man-made environments. While traditional simplification algorithms focus on generality and smooth meshes, the approach presented here considers a specific class of man-made models. By detecting and classifying edge loops on the mesh and providing a guided series of binary mesh partitions, our approach generates a series of simplified models, each of which better respects the semantics of these kinds of models than conventional approaches do. A guiding principle is to eliminate simplifications that do not make sense in constructed environments. This, coupled with the concept of "punctuated simplification", leads to an approach that is both efficient and delivers high visual quality. Comparative results are given.

关键词： Object oriented programming

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