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Machine graphics and Vision 2005年第2期14卷 159-169页

作者： Barsi, A. Szirmay-Kalos, L. Szécsi, L. Department of Control Engineering and Information Technology Budapest University of Technology and Economics Magyar Tudósok krt. 2 Budapest H-1117 Hungary Computer Graphics Lab Budapest University of Technology and Economics Department of Control Engineering and Information Technology Budapest University of Technology and Economics Department of Control Engineering and Information Technology Computer Graphics Lab.

In many computer graphics applications it is desirable to augment virtual objects with high dynamic range images representing the real environment. In order to provide an illusion that virtual objects are part of the real scene, illumination of the environment should be taken into account when rendering them. Proper calculation of the illumination from an environment map may be extremely expensive if we wish to account for occlusion, self shadowing and specular materials. In this paper we present a method that performs all the calculations on a per-frame basis, and is already real-time on non-cutting-edge hardware.

关键词： computer graphics

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Comparison of keyword spotting approaches for informal continuous speech

Comparison of keyword spotting approaches for informal conti...

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9th European Conference on Speech Communication and technology

作者： Szöke, Igor Schwarz, Petr Matějka, Pavel Burget, Lukáš Karafiát, Martin Fapšo, Michal Černocký, Jan Department of Computer Graphics and Multimedia Faculty of Information Technology Brno University of Technology Czech Republic

This paper describes several approaches to keyword spotting (KWS) for informal continuous speech. We compare acoustic keyword spotting, spotting in word lattices generated by large vocabulary continuous speech recognition and a hybrid approach making use of phoneme lattices generated by a phoneme recognizer. The systems are compared on carefully defined test data extracted from ICSI meeting database. The acoustic and phoneme-lattice based KWS are based on a phoneme recognizer making use of temporal-pattern (TRAP) feature extraction and posterior estimation using neural nets. We show its superiority over traditional HMM/GMM systems. The advantages and drawbacks of different approaches are discussed.

关键词： Speech analysis

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Ship hull fitting using NURBS

Ship hull fitting using NURBS

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2nd Conference on computer graphics, Imaging, and Vision: New Trends 2005

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)0769523927

Ship hull form module is the main module in ship design. The problem of creating fair ship hull surface is of major importance in computer Aided Ship Design environment. The fairness of these surfaces is generally considered a subjective notion depending on the judgment of the designers (e.g. 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 problem can take on many different characteristics, depending on the goal of the reconstruction, the origin of the offset, and tools or methods available to tackle the job. All of these must be taken into account in developing the best approach to solving the problem in the most efficient manner. In this research, the implementation of NURBS method is used because it brings the most convincing results. © 2005 IEEE.

关键词： Structural design

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A multi-layered approach to optical burst-switched based grids

A multi-layered approach to optical burst-switched based gri...

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International Conference on Broadband Networks (BroadNets)

作者： F. Farahmand M. De Leenheer P. Thysebaert B. Volckaert F. De Turck B. Dhoedt P. Demeestert J.P. Jue Department of Computer Electronics and Graphics Technology Central Connecticut State University Gent Belgium Department of Computer Electronics and Graphics Technology Central Connecticut State University Dept. of Electrical Engineering and Computer Science The University of Texas at Dallas Department of Information Technology Ghent University-IBBT-IMEC Gent Belgium Department of Electrical Engineering and Computer Science University of Texas Dallas Gent Belgium Dept. of Information Technology Ghent University - IBBT - IMEC Gaston Crommenlaa Belgium

In this paper we consider implementing optical burst switching as an alternative approach to meet computationally intensive grid applications. Such architecture has been referred to as grid-over-OBS (GoOBS). We first present a unique layered architecture for grid-over-OBS and position OBS protocol stack within the framework of the layered grid architecture. Then, we present a generic framework for anycast routing in the context of GoOBS when requests don't have explicit addresses and they can be serviced by any appropriate grid resource. We develop several algorithms to support an casting when only a single copy of a request is transmitted. Through simulation analysis, we show the performance of our anycast algorithms and compare them with the shortest-path unicast routing in which all jobs have specific addresses. In our performance analysis, we focus on average end-to-end delay and blocking probability of requests

关键词： computer architecture Routing Performance analysis Optical burst switching computer applications Grid computing Optical computing Protocols Context-aware services Casting

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Image-based 3D face modeling system

Image-based 3D face modeling system

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作者： Park, In Kyu Zhang, Hui Vezhnevets, Vladimir School of Information and Communication Engineering Inha University 253 Younghyun-dong Nam-gu Incheon 402-751 Korea Republic of Computing Lab Samsung Advanced Institute of Technology San 14-1 Nongseo-ri Giheung-eup Yongin 449-712 Korea Republic of Graphics and Media Lab Department of Computational Mathematics and Cybernetics Moscow State University Moscow 119899 Russia School of Information and Communication Engineering Inha University Korea Republic of IEEE IEEE Computer Society ACM Samsung Advanced Institute of Technology Yongin Korea Republic of Graphics and Media Lab Computer Science Department Moscow State University

This paper describes an automatic system for 3D face modeling using frontal and profile images taken by an ordinary digital camera. The system consists of four subsystems including frontal feature detection, profile feature detection, shape deformation, and texture generation modules. The frontal and profile feature detection modules automatically extract the facial parts such as the eye, nose, mouth, and ear. The shape deformation module utilizes the detected features to deform the generic head mesh model such that the deformed model coincides with the detected features. A texture is created by combining the facial textures augmented from the input images and the synthesized texture and mapped onto the deformed generic head model. This paper provides a practical system for 3D face modeling, which is highly automated by aggregating, customizing, and optimizing a bunch of individual computer vision algorithms. The experimental results show a highly automated process of modeling, which is sufficiently robust to various imaging conditions. The whole model creation including all the optional manual corrections takes only 2-3 minutes. © 2005 Hindawi Publishing Corporation.

关键词： computer simulation

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Ship hull fitting using NURBS

Ship hull fitting using NURBS

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International Conference on computer graphics, Imaging and Visualization, CGIV

作者： A.S. Wen S.M.H. Shamsuddin Y. Samian Department of Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia Malaysia Department Of Marine Technology Faculty of Mechanical Engineering Universiti Teknologi Malaysia Malaysia

Ship hull form module is the main module in ship design. The problem of creating fair ship hull surface is of major importance in computer aided ship design environment. The fairness of these surfaces is generally considered a subjective notion depending on the judgment of the designers (e.g. 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 problem can take on many different characteristics, depending on the goal of the reconstruction, the origin of the offset, and tools or methods available to tackle the job. All of these must be taken into account in developing the best approach to solving the problem in the most efficient manner. In this research, the implementation of NURBS method is used because it brings the most convincing results.

关键词： Design automation Surface fitting Curve fitting Computational geometry

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Geometric spanners for routing in mobile networks

Geometric spanners for routing in mobile networks

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作者： Gao, Jie Guibas, Leonidas J. Hershberger, John Zhang, Li Zhu, An Department of Computer Science Stanford University Stanford CA 94305 United States Ctr. for the Math. of Information California Institute of Technology Pasadena CA 91125 United States Mentor Graphics Corporation Wilsonville OR 97070 United States Compaq Systems Research Center Palo Alto CA Information Dynamics Laboratory Hewlett Packard Laboratories Palo Alto CA 94304 United States

We propose a new routing graph, the restricted Delaunay graph (RDG), for mobile ad hoc networks. Combined with a node clustering algorithm, the RDG can be used as an underlying graph for geographic routing protocols. This graph has the following attractive properties: 1) it is planar;2) between any two graph nodes there exists a path whose length, whether measured in terms of topological or Euclidean distance, is only a constant times the minimum length possible;and 3) the graph can be maintained efficiently in a distributed manner when the nodes move around. Furthermore, each node only needs constant time to make routing decisions. We show by simulation that the RDG outperforms previously proposed routing graphs in the context of the Greedy perimeter stateless routing (GPSR) protocol. Finally, we investigate theoretical bounds on the quality of paths discovered using GPSR.

关键词： Telecommunication networks

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Metabolic visualization and intelligent shape analysis of the hippocampus

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International Conference on Computational Intelligence and Security, CIS 2005

作者： Choi, Yoo-Joo Kim, Jeong-Sik Kim, Min-Jeong Choi, Soo-Mi Kim, Myoung-Hee Institute for Graphic Interfaces Ewha-SK Telecom Building 11-1 Daehyun-Dong Seodaemun-Ku Seoul Korea Republic of Department of Computer Science and Engineering Ewha Womans University Daehyun-Dong Seodaemun-Ku Seoul Korea Republic of Center for Computer Graphics and Virtual Reality Ewha Womans University Daehyun-Dong Seodaemun-Ku Seoul Korea Republic of School of Computer Engineering Sejong University Seoul Korea Republic of Department of Computer Application Technology Seoul University of Venture and Information Seoul Korea Republic of

ISBN: (纸本)3540308199

This paper suggests a prototype system for visualization and analysis of anatomic shape and functional features of the hippocampus. Based on the result of MR-SPECT multi-modality image registration, anatomical and functional features of hippocampus are extracted from MR and registered SPECT images, respectively. The hippocampus is visualized in 3D by applying volume rendering to hippocampus volume data extracted from the MR image with color coded by registered SPECT image. In order to offer the objective and quantitative data concerning to the anatomic shape and functional features of the hippocampus, the geometric volume and the SPECT intensity histogram of hippocampus regions are automatically measured based on the MR and the registered SPECT image, respectively. We also propose a new method for the analysis of hippocampal shape using an integrated Octree-based representation, consisting of meshes, voxels, and skeletons. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Image analysis

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A Cultural Heritage Repository as Source for Learning Materials

A Cultural Heritage Repository as Source for Learning Materi...

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5th International Symposium on Virtual Reality, Archaeology and Intelligent Cultural Heritage, VAST 2004

作者： Patel, Manjula Walczak, Krzysztof Giorgini, Fabrizio White, Martin UKOLN University of Bath United Kingdom Department of Information Technology The Poznan University of Economics Poland GIUNTI Interactive Labs Italy Centre for VLSI and Computer Graphics University of Sussex United Kingdom

ISBN: (纸本)3905673185

We discuss a system for the digital capture of museum artefacts which are accumulated into a multimedia repository comprising 3D models, images, video and sound clips as well as textual descriptions. A comprehensive set of metadata is recorded and stored alongside these various media with the aim of reusing and re-purposing them for multiple applications. We investigate issues relating to both internal and external interoperability to enable the creation of learning scenarios within the system itself as well as the export of primary multimedia objects into an independent, external Learning Content Management System for the creation of complex Learning Objects. © The Eurographics Association 2004.

关键词： Interoperability

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Framework for real time cloud rendering

Framework for real time cloud rendering

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International Conference on computer graphics, Imaging and Visualization, CGIV

作者： M.A. Rana M.S. Sunar M.N.N. Hayat S. Kari A. Bade Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System University Technology of Malaysia Skudai Johor Malaysia

computer graphics (CG) is a key technology for producing visual contents. Currently computer generated imagery techniques are being developed and applied, particularly in the field of virtual reality applications, film production, training and flight simulators, to provide total composition of realistic computer graphic images. Clouds are an integral feature of the sky without them synthetic outdoor scenes seems unrealistic. Modeling and animating clouds is a difficult task. Most systems are difficult to use, as they require adjustment of numerous, complex parameters, and are noninteractive. This paper presents an intuitive, interactive system to artistically model, animate, and render visually convincing clouds using modern graphics hardware. A high-level interface models clouds through the visual use of cubes. Clouds are rendered as textured billboards by making use of hardware accelerated API - OpenGL. The resulting interactive design and rendering system produces perceptually convincing cloud models that can be used in any interactive system.

关键词： Clouds Rendering (computer graphics) computer graphics Animation Interactive systems Hardware Character generation Image generation Virtual reality Application software

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