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检索条件"机构=Visualization and Computer Graphics"

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Texture-based visualization of unsteady 3d flow by real-time advection and volumetric illumination

Texture-based visualization of unsteady 3d flow by real-time...

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作者： Weiskopf, Daniel Schafhitzel, Tobias Ertl, Thomas IEEE Computer Society Graphics Visualization and Usability Lab. School of Computing Science Simon Fraser University Burnaby BC V5A 1S6 Canada Institute of Visualization and Interactive Systems University of Stuttgart Universitätsstr. 38 70569 Stuttgart Germany

This paper presents an interactive technique for the dense texture-based visualization of unsteady 3D flow, taking into account issues of computational efficiency and visual perception. High efficiency is achieved by a 3D graphics processing unit (QPU)-based texture advection mechanism that implements logical 3D grid structures by physical memory in the form of 2D textures. This approach results in fast read and write access to physical memory, independent of GPU architecture. Slice-based direct volume rendering is used for the final display. We investigate two alternative methods for the volumetric illumination of the result of texture advection: First, gradient-based illumination that employs a real-time computation of gradients, and, second, line-based lighting based on illumination in codimension 2. In addition to the Phong model, perception-guided rendering methods are considered, such as cool/warm shading, halo rendering, or color-based depth cueing. The problems of clutter and occlusion are addressed by supporting a volumetric importance function that enhances features of the flow and reduces visual complexity in less interesting regions. GPU implementation aspects, performance measurements, and a discussion of results are included to demonstrate our visualization approach. © 2007 IEEE.

关键词： Data visualization

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Freeform Image

Freeform Image

引用

Pacific Conference on computer graphics and Applications

作者： Thomas Schiwietz Joachim Georgii Rudiger Westermann Siemens Corporate Research Imaging & Visualization Princeton USA Computer Graphics & Visualization Technische Universität München Munich Germany

ISBN: (纸本)9780769530093;0769530095

In this paper we present a technique for image deformation in which the user is given flexible control over what kind of deformation to perform. Freeform image extends available image deformation techniques in that it provides a palette of intuitive tools including interactive object segmentation, stiffness editing and force-based controls to achieve both a natural look and realistic animations of deforming parts. The model underlying our approach is physics-based and it is amenable to a variety of different kinds of image manipulations ranging from as-rigid- as-possible to fully elastic deformations. We have developed a multigrid solver for quadrangular finite elements, which achieves real-time performance for high resolution pixel grids. On recent CPUs this solver can handle about 16K co-rotated finite elements at roughly 60 ms.

关键词： computer graphics visualization Force control Finite element methods Shape control Interpolation Application software Object segmentation Animation Deformable models

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Feature Emphasis and Contextual Cutaways for Multimodal Medical visualization

Feature Emphasis and Contextual Cutaways for Multimodal Medi...

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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 ...

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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

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.

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...

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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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File-formats for preservation: Evaluating the long-term stability of file-formats

File-formats for preservation: Evaluating the long-term stab...

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11th International Conference on Electronic Publishing, ELPUB 2007

作者： Rauch, Carl Krottmaier, Harald Tochtermann, Klaus Styria Media AG Schönaugasse 64 8010 Graz Austria Institute for Computer Graphics and Knowledge Visualization Graz University of Technology Infeldgasse 16c 8010 Graz Austria Knowledge Management Institute Graz University of Technology and Know-Center Graz Infeldgasse 21/II 8010 Graz Austria

ISBN: (纸本)9783854372929

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 nontraditional objects (such as 3D-documents, music etc.).

关键词： Search engines

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Visualizing spray paint deposition in VR training

Visualizing spray paint deposition in VR training

引用

2007 IEEE Virtual Reality Conference, VR'07

作者： Daeseok, Kim Youngwoo, Yoon Sunyu, Hwang Geehyuk, Lee Jinah, Park Information and Communications University Electronics and Telecommunications Research Institute Computer Graphics and Visualization Lab. 119 Munjiro Yuseong-gu Daejeon 305-714 Korea Republic of Human-Computer Interaction Lab. 119 Munjiro Yuseong-gu Daejeon 305-714 Korea Republic of Virtual Reality Research Team 161 Gajeong-dong Yuseong-gu Daejeon 305-700 Korea Republic of

ISBN: (纸本)1424409055

We present a real-time simulation of spray painting incorporated into a VR environment as an alternative training system for ship-building industries. The system allows the user to try out a painting work on life-size structures with a spray gun. Our goal is to provide a trainee realistic painting experience in real-time as well as to represent the thickness of the deposited paint on the surface for evaluation of his performance. The Gaussian model is used for a painting deposition model, and texture mapping technique is utilized to provide efficient visual feedback. We also present effective collision detection methods for a volume of spray paint particles. ©2007 IEEE.

关键词： Interactive computer graphics

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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...

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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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Realistic and interactive simulation of rivers

Realistic and interactive simulation of rivers

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32nd graphics Interface Conference

作者： Kipfer, Peter Westermann, Ruedinger Havok India Computer Graphics and Visualization Technische Universität München Germany

ISBN: (纸本)1568813082

In this paper we present interactive techniques for physics-based simulation and realistic rendering of rivers using Smoothed Particle Hydrodynamics. We describe the design and implementation of a grid-less data structure to efficiently determine particles in close proximity and to resolve particle collisions. Based on this data structure, an efficient method to extract and display the fluid free surface from elongated particle structures as they are generated in particle based fluid simulation is presented. The proposed method is far faster than the Marching Cubes approach, and it constructs an explicit surface representation that is well suited for rendering. The surface extraction can be implemented on the GPU and only takes a fraction of the simulation time step. It is thus amenable to real-time scenarios like computer games and virtual reality environments.

关键词： physics-based simulation river flow particle system surface extraction

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