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共 191 条记录，以下是31-40 订阅

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A method for information protection in collaborative assembly design

A method for information protection in collaborative assembl...

引用

9th international conference on computer aided design and computer graphics, CAD/CG 2005

作者： Hui, Xue Jie, Li State Key Laboratory of CAD and CG Zhejiang University China Dept. of Computer Science Drexel University United States

ISBN: (纸本)0769524737

Information security and assurance are emerging frontiers for collaborative design. The collaborative assembly design becomes one style of cooperation in both design and the outsourcing manufacture. However, during this process, some sensitive information that is secret to certain cooperators is at the risk of leakage. IA is of high need in this process. In this paper, we propose a method that provides the ability to hide the sensitive information while releasing the necessary information for the collaborative assembly design and the outsourcing manufacture. Taking the B-rep model as the original input directly, this method provides the solution of information protected model also in B-rep. Moreover, a prototype system SSDSCA carrying out this method has been implemented. © 2005.IEEE.

关键词： computer supported cooperative work

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The curve-structure invariant moments for shape analysis and recognition

The curve-structure invariant moments for shape analysis and...

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9th international conference on computer aided design and computer graphics, CAD/CG 2005

作者： Zongmin, Li Jan, Zhang Yujie, Liu Hua, Li School of Computer Science and Communication Engineering University of Petroleum Shandong 257061 China Institute of Computing Technology Chinese Academy of Science Beijing 100080 China

ISBN: (纸本)0769524737

This correspondence addresses the problem of rotation, scale, and translation invariant recognition of images. Object shape comparability is a challenging problem in the field of pattern recognition and computer vision. The method based on the geometric moment invariants is the typical method in these applications. This paper introduces curve structure moment invariants based on the geometric moment invariants from transforming the density in geometric moments into a new density. The difference in the shapes is increased by using the curve structure moment invariants. Therefore, this method can be used in object shape analysis. To support our new theory, an algorithm for object shape analysis is designed and experiments based on square transform are conducted. Experiments give an encouraging high recognition rate by using the curve structure moment invariants. © 2005.IEEE.

关键词： computer graphics

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GPU-based real-time simulation and rendering of unbounded ocean surface

GPU-based real-time simulation and rendering of unbounded oc...

引用

9th international conference on computer aided design and computer graphics

作者： Yang, XD Pi, XX Zeng, L Li, SK Natl Univ Def Technol Sch Comp Changsha 410073 Peoples R China

ISBN: (纸本)0769524737

We present a multi-resolution mesh model of the ocean surface based on a straightforward terrain LOD scheme, Tiled Quad-tree, with that the region of ocean surface can be extended limitlessly and readily adapted for GPU acceleration. We have introduced the concept of Wrapped Fractal Surface (WFS) for generating height field map of the ocean. Through WFS self-mapping, we can create a series of WFS and obtain the height field map at discrete times without repeating tiles. By interpolating the height map at regular intervals we can build an ocean surface continuously and dynamically. This paper also studied shallow ocean waves concerned about affects of seaboard and underwater terrain. Experimental results showed that our approach was effective and would satisfy the requirements of a realistic real-time navigation for large-scale seascape.

关键词： computer graphics

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Acceleration of regular grid traversals using extended chessboard distance transformation on GPU

Acceleration of regular grid traversals using extended chess...

引用

9th international conference on computer aided design and computer graphics

作者： Es, A Isler, V Tübitak-Bilten METU Turkey METU Computer Engineering Dept. Turkey

ISBN: (纸本)0769524737

In the recent years graphics Processing Units (GPU) have evolved into general purpose programmable streaming parallel processors. This evolution makes it possible to implement high quality photo realistic rendering techniques on graphics processors. There has been a few studies to show how to map ray tracing to the GPU Since graphics processors are not designed to process complex data structures, it is crucial to explore data structures and algorithms for efficient stream processing. In particular ray traversal is one of the most time consuming parts of ray tracing methods. In this work we focus on the efficient ray traversals on GPU. Several known techniques have been redesigned and adapted to the GPU programming model. Also a new traversal method based on extended anisotropic chessboard distance metric has been introduced

关键词： coprocessors parallel processing ray tracing rendering (computer graphics) GPU anisotropic chessboard distance metric chessboard distance transformation general purpose programmable streaming parallel processors graphics processing units photo realistic graphics Processing Unit Ray tracing Coprocessors PARALLEL PROCESSING (computerS) Rendering (computer graphics) acceleration distance transform Data structures

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Dynamic labeling management in virtual and augmented environments

Dynamic labeling management in virtual and augmented environ...

引用

9th international conference on computer aided design and computer graphics, CAD/CG 2005

作者： Fan, Zhang Hanqiu, Sun Dept. of Computer Science and Engineering Chinese University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0769524737

Most applications in virtual and augmented reality usually need to visualize large amounts of extra text/image/video annotations associated with objects to assist user's navigation. Labeling is one of the most intuitive techniques to achieve this goal, which attaches specific texts to related objects to provide users a clear environmental clue. The basic problem of labeling is the clutters due to unexpected overlapping and occlusion among labels and objects, which makes the environment ambiguous and obscure. In this paper, we present the interactive system of dynamic labeling management to address this problem for virtual environment navigation applications. Our system integrates the techniques of labeling with adaptive placement, view-driven label filtering and structured label searching. These features have been developed in our system with well display of augmented labels in VR applications. © 2005.IEEE.

关键词： Virtual reality

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Mesh simplification and adaptive LOD for finite element mesh generation

Mesh simplification and adaptive LOD for finite element mesh...

引用

9th international conference on computer aided design and computer graphics

作者： Date, H Kanai, S Kishinami, T Nishigaki, I Hokkaido Univ Sapporo Hokkaido 060 Japan

ISBN: (纸本)0769524737

In this paper, we propose a new triangular finite element mesh generation method based on simplification of high-density mesh and adaptive Level-of-Detail (LOD) methods for efficient CAE. Mesh simplification evaluating mesh properties is applied to control the mesh properties required for FE mesh, such as the number of triangular elements, element shape quality and size while keeping the specified approximation tolerance. Adaptive LOD methods based on vertex hierarchy according to curvature and region of interest, and global LOD method preserving density distributions are also proposed in order to construct a more appropriate FE mesh. These methods enable efficient generation of FE meshes with appropriate properties for analysis from a high-density mesh. Finally, the effectiveness of our approach is shown through evaluations of the FE meshes for practical use.

关键词： computer aided engineering mesh generation adaptive level-of detail methods mesh simplification triangular finite element mesh generation mesh generation Medical Subject Headings simplification

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Implicit fitting and smoothing using radial basis functions with partition of unity

Implicit fitting and smoothing using radial basis functions ...

引用

9th international conference on computer aided design and computer graphics, CAD/CG 2005

作者： Xiaojun, Wu Michael, Yu Wang, Qi Xia Department of Automation and Computer-Aided Engineering Chinese University of Hong Kong Shatin NT Hong Kong Department of Automation and Mechatronics Harbin Institute of Technology Shenzhen Graduate School

ISBN: (纸本)0769524737

A new scheme for 3D reconstruction of implicit surfaces from large scattered point sets based on the radial basis functions (RBFs) is proposed in this paper. The partition of unity (POU) method and a binary tree is used to organize the point sets into some overlapping local subdomains and reconstructing a local surface for each of the subdomains from non-disjunct subsets of the points, we use only a single point at the offset of the surface to avoid the trivial solution of RBF linear system. When the offset point is chosen properly, the technique is not only efficient but also robust, offering a higher level of scalability. The global solution can be obtained by combining the local solutions with POU equations. We also adapt the methodology of level set propagation of a dynamic surface and employ it for smoothing the reconstructed surfaces. We develop versatile computational framework with many benefits in topological flexibility and numerical efficiency. © 2005.IEEE.

关键词： computer graphics

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Voxel-based representation, display and thickness analysis of intricate shapes

Voxel-based representation, display and thickness analysis o...

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9th international conference on computer aided design and computer graphics

作者： Patil, S Ravi, B Indian Inst Technol Bombay 400076 Maharashtra India

ISBN: (纸本)0769524737

An efficient voxel representation scheme coupled with algorithms for voxelisation, display and thickness analysis of complex free form shapes is presented. The binary voxel model is stored as a stack of layers represented as bit-arrays. Polygonal solid models are converted into voxel format with a maximum resolution of 1000 (one billion voxels) in less than 2 minutes. Near real-time visualization of the voxel model is achieved by direct point rendering using a look-up table based on a finite set of neighbour voxel configurations. Thickness analysis is performed in terms of cross-sectional visualisation, progressive skin removal and radiography with minimum, maximum and total thickness along an orthographic direction. Testing of the algorithms for intricate shapes like Ganesha idol, pelvis bone and automobile cylinder gave satisfactory results. The voxel framework can be coupled to traditional CAD/CAM systems, providing additional capabilities to product engineers.

关键词： data visualisation rendering (computer graphics) solid modelling complex free form shapes cross-sectional visualisation direct point rendering display analysis intricate shapes look-up table neighbour voxel configurations polygonal solid models progressi entity modeling Data visualisation pixel Rendering (computer graphics) color lookup table

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Length-preserved natural boundary for intrinsic parameterization

Length-preserved natural boundary for intrinsic parameteriza...

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9th international conference on computer aided design and computer graphics

作者： Wang, CCL Chinese Univ Hong Kong Sha Tin 100083 Peoples R China

ISBN: (纸本)0769524737

This paper proposes a fast approach to generate length-preserved natural boundary for intrinsic parameterization. Given a triangular mesh with disk-like topology, we compute an optimal boundary for its parameterization. An optimal boundary is expected to be length-preserved with the length of every triangular edge on the boundary is invariant before and after parameterization;also, the boundary is requested to be natural where the inner angle is close to the angle excess at every boundary vertex on the given mesh. Computation of a length-preserved natural boundary is formulated as a constrained non-linear optimization problem, the procedure of solving which is in general very time-consuming. Here, we speed tip the optimization by adopting the scheme of sequential linearly constrained programming. It is shown at the end of this paper that our length-preserved natural boundary could greatly improve the speed and quality of the original intrinsic parameterization.

关键词： computer graphics constraint handling mesh generation nonlinear programming topology constrained nonlinear optimization disklike topology intrinsic parameterization length-preserved natural boundary optimal boundary sequential linearly constrained progra constraint handling mesh generation Nonlinear Programming computer graphics Boundary topology parameterization natural triangular mesh Constrained optimization

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Foreground-distortion method for image synthesis

Foreground-distortion method for image synthesis

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9th international conference on computer aided design and computer graphics, CAD/CG 2005

作者： Jing, Huang Changzhen, Xiong Dongxu, Qi Zesheng, Tang Faculty of Information Technology Macao University of Science and Technology China School of Information Science and Technology Sun Yet-sen University Guangzhou 510275 Computer Science Dept. Tsinghua University Beijin 100084

ISBN: (纸本)0769524737

A new image synthesis method, which is called Foreground-Distortion, is presented in this paper. In this method, foreground extraction procedure is used to get the interesting part from the texture sample, and Many-Knot spline interpolation distortion method is used to generate similar texture foregrounds. These similar texture foregrounds are extracted and copied onto a larger background image and a new output image will be synthesized. Compared with other methods, this method is simple and fast, texture seam problem can be avoided and, fewer texture samples even only one will be used to generate a large synthesized image. The sheltering effect between texture foregrounds can be implemented in this method while the texture foregrounds are overlapped. The results for synthesizing natural scenes and random textures are shown. We also demonstrate how this method can be used to interactively merge different images to generate new pictures. © 2005.IEEE.

关键词： Interactive computer graphics

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