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检索条件"任意字段=Conference on Computer Graphics, Imaging and Visualisation"

共 327 条记录，以下是211-220 订阅

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Traversal on DAG-based multiresolution mesh hierarchy

Traversal on DAG-based multiresolution mesh hierarchy

引用

International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Zheng, Zhi Chan, Tony K.Y. School of Computer Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)0769526063

Traversal algorithm on the multiresolution hierarchy is critical for the view-dependent level of detail system. In this paper, we study multiresolution hierarchy traversal for a DAG hierarchy of vertex-split/edge-collapse operations, in the context of a client-server based system. We present a general traversal management strategy that is beneficial for interactive frame rate and triangle-budget control, and is also favorable for the client-server based system. We adapt two commonly used traversal algorithms, linear traversal and priority-oriented traversal, to work under the management strategy. And we also propose a constant-time traversal algorithm. Extensive experiments on these three traversal algorithms are done and the comparison results can be used as a guide to choose the most appropriate traversal algorithm for different system requirements. © 2006 IEEE.

关键词： Hierarchical systems

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Active contour model with shape constraints for bone fracture detection

Active contour model with shape constraints for bone fractur...

引用

International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Jia, Y. Jiang, Y. Department of Computer Science Ryerson University Toronto Ont. M5B 2K3 Canada

ISBN: (纸本)0769526063

This paper presents a segmentation method that outlines fractured bones in an X-ray image of a patient's arm within casting materials, and displays the alignment between the fractured bones. This segmentation task is often difficult because the casting materials cause a low contrast and high noise ratio in the X-ray images. A geodesic active contour model with global constraints is applied to this task. A prior shape is collected and used as a global constraint of our model. A maximum-likelihood function is derived to provide feedback for each evolving process. Experimental results show that the method produces the outlines of the fractured bones on the low contrast X-ray images robustly and accurately. © 2006 IEEE.

关键词： Image segmentation

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Frequency-domain algorithms for visual analysis on genomic structures in prokaryotes

Frequency-domain algorithms for visual analysis on genomic s...

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Cheong, Lee Sing Lin, Feng Seah, Hock Soon Bioinformatics Research Centre Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore School of Computer Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore

ISBN: (纸本)0769526063

Frequency-domain algorithms are studied to provide the composition of each nucleic acid base simultaneously across numerous frequencies and along the base-positions, through Fourier transformation and color mapping of the bases. And also, composite colored scalograms are constructed by continuous wavelet transformation to provide their individual localized time and periodic energy content in a single figure. The visualization of three-dimensional information in the forms of bases, frequencies and base-positions allows visual analysis of correlated structural and genomic information, which can hardly be obtained from the conventional character string analysis. Significant features of the studied prokaryotic genomes were revealed by the use of the programs developed. © 2006 IEEE.

关键词： Genetic engineering

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A technique for visualizing dihedral signal of large protein sequences

A technique for visualizing dihedral signal of large protein...

引用

International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Nguyen, Quang Vinh Huang, Mao Lin Qian, Yu Zhang, Kang Faculty of Information Technology University of Technology Sydney Australia Department of Computer Science University of Texas at Dallas TX United States

ISBN: (纸本)0769526063

This paper presents a clustering and visualization technique for analyzing dihedral angles of large protein sequences. The clustering is used for discovering and grouping those similar dihedrals while the visualization can display and navigate sequences of dihedral angles of several proteins as well as their clustered property. In order to visualize a very large sequence of hundred thousands of dihedral signals, we plot them on a spiral coordinate system. This spiral visualization ensures the linear distribution without distortion or interruption of a very long sequence of points. A clustering algorithm is also provided to group those dihedral signals into different clusters so that it can enhance the analysis process. Our system can also zoom to display a number of selected proteins interactively. © 2006 IEEE.

关键词： Proteins

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3D model generation by morphing

3D model generation by morphing

引用

International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Kaneko, Kosuke Okada, Yoshihiro Niijima, Koichi Graduate School of Information Science and Electrical Engineering Kyushu University 6-1 Kasuga-koen Kasuga Fukuoka 816-8580 Japan

ISBN: (纸本)0769526063

This paper proposes a 3D model generation system that outputs intermediate3D shape models between two already existing 3D models by morphing. Although there have been a lot of computer animation software, it takes a long time to create a 3D shape model even using such computer animation software. Morphing is one of the techniques used to easily create 3D models. If we have two different 3D shape models, it is possible to generate intermediate 3D shape models between them by morphing. However, there are two main problems in the morphing of polygonal models. Those are vertex mismatch and semantic topology mismatch. In this paper, the authors propose an algorithm that is free from the vertex mismatch problem and that automatically determines the semantic topology match. The proposed system based on the algorithm decomposes both two polygonal models, makes decomposed element pairs between them, and then generates intermediate 3D shape models by morphing as for the decomposed element pairs automatically. © 2006 IEEE.

关键词： computer graphics

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Optimized NURBS ship hull fitting using simulated annealing

Optimized NURBS ship hull fitting using simulated annealing

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Wen, Ang Swee Shamsuddin, Siti Mariyam Hj. Samian, Yahya Department of Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Department of Marine Technology Faculty of Mechanical Engineering Universiti Teknologi Malaysia

ISBN: (纸本)0769526063

The shape of a NURBS curve or surface is defined by the location of its control points, the control points' weights, and the knot vectors. Most of the curve and surface design tried to modify the control points. However, it is still impossible to obtained accurate control points for a reconstructed NURBS curve or surface. The fitness of these surfaces is generally considered a subjective notion depending on the judgment of the designers (eg. visually pleasing, devoid of unnecessary bumps or wiggles, satisfying certain continuity requirements). One of the restriction in ship hull design is that the existing details of a ship design on paper or a ship that already been constructed physically couldn't be reconstructed accurately and concisely in a ship hull design software. This research strives to solve this problem by creating fair ship hull surface using NURBS. An optimized NURBS ship hull fitting approach using simulated annealing is developed. Evaluation and analysis (accuracy, fairness and speed of processing) on the proposed approach is done.

关键词： Ships

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NPAR by Example: Line drawing facial animation from photographs

NPAR by Example: Line drawing facial animation from photogra...

引用

International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Yuan, Luo Gavrilova, Marina L. Sousa, Mario Costa Department of Computer Science University of Calgary Calgary Alta. T2N 1N4 Canada

ISBN: (纸本)0769526063

This paper presents a new method for generating nonphotorealistic (NPR) facial expression animations. The method consists of two main processing parts. First, a particular NPR style portrait is created from a frontal facial photograph. Facial expressive details, like: expressive wrinkles,fine creases, even freckles, can be included in the synthesized portrait, which makes it more expressive. Second, with two different facial expression portraits, a metamorphing algorithm using distance transform is utilized to produce the 2D animation. Our morphing process is fully automated, no control point or any manual work is required. Finally, a continuous facial expression animation is produced. The resulted animation is useful in a number of potential applications, ranging from entertainment and education to teleconferencing and psychology research. © 2006 IEEE.

关键词： Face recognition

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Improved three-step phase shifting profilometry using digital fringe pattern projection

Improved three-step phase shifting profilometry using digita...

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Hu, Yingsong Xi, Jiangtao Chicharo, Joe Yang, Zongkai School of Electrical Computer and Telecommunications Engineering University of Wollongong NSW 2522 Australia Department of Electronic and Information Engineering Huazhong University of Science and Technology Wuhan City 430074 China

ISBN: (纸本)0769526063

In this paper, an improved method for three-step phase shifting profilometry (PSP) is presented to eliminate the errors introduced by the second order harmonic when digital projection are used to generate fringe patterns. Firstly, the error caused by the second order harmonic is theoretically analyzed. Then based on the error analysis and principle of PSP, we propose a novel approach, called improved three-step phase shifting profilometry (I3PSP), to eliminate the influence of the second order harmonic. Finally, simulations are performed to verify the effectiveness of the proposed I3PSP, which demonstrate that the reconstruction accuracy of using three-step PSP has been significantly improved by the proposed I3PSP. © 2006 IEEE.

关键词： Phase shift

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Handwritten signature verification using image invariants and dynamic features

Handwritten signature verification using image invariants an...

引用

International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Al-Shoshan, Abdullah I. Computer Science Department Qassim University P.O Box 1928 Unaizah 51911 Saudi Arabia

ISBN: (纸本)0769526063

In this paper, a development of automatic signature classification system is proposed. We have presented off-line and online signature verification system, based on the signature invariants and its dynamic features. The proposed system segments each signature based on its perceptually important points and then, for each segment, computes a number of features that are scale, rotation and displacement invariant. The normalized moments and the normalized Fourier descriptors are used for this invariancy, while the speed of pen is used as a dynamic feature of the signature. In both cases the data acquisition, pre-processing, feature extraction and comparison steps are analyzed and discussed. Both static and dynamic features were used as an input to a neural network. The neural network used for classification is a multi-layer perception (MLP) with one input layer, one hidden layer and one output layer. The performance of the proposed system is presented through simulation examples. © 2006 IEEE.

关键词： Pattern matching

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Gridding multivariate positive data for real time visualization

Gridding multivariate positive data for real time visualizat...

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International conference on computer graphics, imaging and visualisation, CGIV'06

作者： Mustafa, Ghulam Shah, Abad Ali Asim, Muhammad Rafiq Department of Computer Science and Engineering UET Lahore Pakistan R and D Center of Computer Science UET Lahore Pakistan COMSATS Institute IT Off Raiwind Road Lahore Pakistan

ISBN: (纸本)0769526063

Common visualization methods require an underlying grid. For visualization of scattered data samples it is required to approximate the data at the same grid using some interpolation technique. It is common that the data samples are positive and representing the quantities for which negative value is meaningless. For example mass, volume and density are meaningless when negative. Modified Quadratic Shepard method is a commonly used method for gridding purposes. However it does not preserve positivity for inherently positive data sets. This paper discusses the problem of gridding inherently positive data sets for real time visualization applications using Modified Quadratic Shepard's method. Key requirement for an algorithm to be used for real time application is its predictable timing behavior. We present an efficient and deterministic alternative Quadratic Shepard Method as a solution to the problem of visualization of multivariate positive data in real time. © 2006 IEEE.

关键词： Real time control

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