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A versatile hierarchical mesh for subdivision surfaces

IEEE Potentials 2008年第5期27卷 20-25页

作者： Fünfzig, Christoph Müller, Kerstin Janetzek, Rafael Techmann, Torsten PRISM Lab. Arizona State University United States PRISM Lab. Arizona State University Computer Graphics and Visualization University of Kaiserslautern Germany Darmstadt University of Technology Germany

The construction and processing of surface geometry can be done by connecting surface primitives to vertices, edges, and neighbors. The representation schemes of surface geometry are vertex-based, edge-based, and quad-edge-based. Catmull and Clark rule of subdivision includes three different rules to create new vertices in the refined control mesh, that are vertex, edge, and face subdivision rule. A new vertex can be created in the refined mesh as a convex combination of the vertices in the neighborhood of vertex, edge, and face in the control mesh. The first subdivision step has a quadrangle control mesh and number of vertices with valence unequal to four constant during refinement. The Charles Loop subdivision scheme is based on box spline and during a subdivision a triangle is divided into four triangles through vertex and edge subdivision rule.

关键词： Mesh generation

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Proxy based parallel data transfer mechanism in grid environment

Proxy based parallel data transfer mechanism in grid environ...

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1st International Conference on Intelligent Networks and Intelligent Systems, ICINIS 2008

作者： Xiong, Muzhou Jin, Hai Wu, Song Service Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769533919

This paper proposes a novel parallel data transfer mechanism to improve the performance of data transfer in grid environment. It utilizes the servers distributed in grid system and selects some of them as the proxy servers. It introduces the method of how to select the proxy server. Then data are divided into several parts and sent through the selected proxy servers with different physical links. By that, it can effectively improve the performance of data transfer. © 2008 IEEE.

关键词： Data transfer

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MSVM-kNN: Combining SVM and k-NN for multi-class text classification

MSVM-kNN: Combining SVM and k-NN for multi-class text classi...

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1st IEEE International Workshop on Semantic Computing and Systems, WSCS 2008

作者： Yuan, Pingpeng Chen, Yuqin Jin, Hai Huang, Li Service Computing Technology and System Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9780769533162

Text categorization is the process of assigning documents to a set of previously fixed categories. It is widely used in many data-oriented management applications. Many popular algorithms for text categorization have been proposed, such as Naïve Bayes, k-Nearest Neighbor (k-NN), Support Vector Machine (SVM). However, those classification approaches do not perform well in every case, for example, SVM can not identify categories of documents correctly when the texts are in cross zones of multicategories, k-NN cannot effectively solve the problem of overlapped categories borders. In this paper, we propose an approach named as Multi-class SVM-kNN (MSVM-kNN) which is the combination of SVM and k-NN. In the approach, SVM is first used to identify category borders, then k-NN classifies documents among borders. MSVM-kNN can overcome the shortcomings of SVM and k-NN and improve the performance of multi-class text classification. The experimental results show MSVM-kNN performs better than SVM or kNN. © 2008 IEEE.

关键词： Support vector machines

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Feature peeling 07

Feature peeling

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graphics Interface 2007

作者： Malik, Muhammad Muddassir Möller, Torsten Gröller, M. Eduard Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Lab. Computing Science Department Simon Fraser University Canada

ISBN: (纸本)1568813376

We present a novel rendering algorithm that analyses the ray profiles along the line of sight. The profiles are subdivided according to encountered peaks and valleys at so called transition points. The sensitivity of these transition points is calibrated via two thresholds. The slope threshold is based on the magnitude of a peak following a valley, while the peeling threshold measures the depth of the transition point relative to the neighboring rays. This technique separates the dataset into a number of feature layers. The user can scroll through the layers inspecting various features from the current view position. While our technique has been inspired by opacity peeling approach, we demonstrate that we can reveal detectable features even in the third and forth layers for both CT and MRI datasets.

关键词： Feature extraction

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Solution of secure multi-party multi-data ranking problem based on El Gamal encryption

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Tongxin Xuebao/Journal on Communications 2007年第11期28卷 1-5页

作者： Liu, Wen Luo, Shou-Shan Chen, Ping School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Software Engineering Beijing University of Posts and Telecommunications Beijing 100876 China National Key Lab. of Integrated Service Networks Xidian University Xi'an 710071 China School of Telecommunication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

Based on El Gamal homomorphic encryption, a protocol of secure multi-party multi-data ranking problem was proposed. The problem extended millionaires' problem. Furthermore, the correctness and security of this protocol were shown in semi-honest model, using the definition of secure multi-party computation. The solution of secure multi-party multi-data ranking problem can form a fundamental basis of new-style electronic transaction, such as private biding and auction, secret online transaction and so on.

关键词： Cryptography

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How real should virtual characters be?

How real should virtual characters be?

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International Conference on Advances in computer Entertainment technology 2006

作者： Wagner, Daniel Billinghurst, Mark Schmalstieg, Dieter Graz University of Technology Institute for Computer Graphics and Vision Inffeldgasse 16 Graz 8010 Austria University of Canterbury HIT Lab. New Zealand Private Bag 4800 Christchurch 8004 New Zealand

ISBN: (纸本)1595933808

In recent years 3D virtual characters have become more common in desktop interfaces, particularly in gaming and entertainment applications. In this paper we describe how augmented reality (AR) technology can be used to bring virtual characters into the real world and compare AR characters to other types of virtual characters. We have developed a handheld AR educational application in which a virtual character teaches users about art history. We present results from a user study that explores how realistic the character needs to be for it to be an effective and engaging educational tool and if augmented reality offers benefits for this type of application. © 2006 ACM.

关键词： Virtual corporation

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Learning from interactive museum installations about interaction design for public settings 06

Learning from interactive museum installations about interac...

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18th Australia Conference on computer-Human Interaction, OZCHI '06

作者： Hornecker, Eva Stifter, Matthias HIT Lab. NZ University of Canterbury Private Bag 4800 Christchurch 8004 New Zealand Institute of Computer Graphics and Algorithms Vienna University of Technology Favoritenstr. 9-11 A-1040 Vienna Austria

ISBN: (纸本)1595935452

This paper reports on the evaluation of a digitallyaugmented exhibition on the history of modern media. We discuss visitors' interaction with installations and corresponding interaction design issues, drawing on results from analysis of logfiles, interviews, and observation in the museum. We see this as an exploration into interaction design of interactive installations for public settings, using the evaluation as a case study on what makes an installation engaging and how it can provide an engaging experience for groups. Copyright the author(s) and CHISIG.

关键词： Museums

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Digital backpacking in the museum with a smartcard 06

Digital backpacking in the museum with a smartcard

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CHINZ 2006: 7th International Conference NZ Chapter of the ACM's Special Interest Group on Human-computer Interaction(SIGCHI-NZ)

ISBN: (纸本)1595934731

This paper reports on the evaluation of a digitally-augmented exhibition on the history of modern media and our experiences with the methodic approach employed. As a central element of this exhibition visitors can buy a smartcard that enables them to store collected or self-created data in a 'digital backpack', which can be accessed via internet as a personalized souvenir. We have evaluated the exhibition, visitors' perceptions and usage of the card using a multi-method strategy complementing quantitative data-analysis with qualitative, ethnographic methods. This paper focuses on visitors' use and the perceived utility of the smartcard, and our experiences with using automatically generated data from interaction logfiles for analyzing visitor behavior, and with the multi-method strategy. Copyright 2006 ACM.

关键词： Human computer interaction

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Punctuated simplification of man-made objects

Punctuated simplification of man-made objects

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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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Reducing blendshape interference by selected motion attenuation 05

Reducing blendshape interference by selected motion attenuat...

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I3D 2005: ACM SIGGRAPH Symposium on Interactive 3D graphics and Games

作者： Lewis, J.P. Mooser, Jonathan Deng, Zhigang Neumann, Ulrich Computer Graphics and Immersive Technology Lab. University of Southern California United States

ISBN: (纸本)9781595930132

Blendshapes (linear shape interpolation models) are perhaps the most commonly employed technique in facial animation practice. A major problem in creating blendshape animation is that of blendshape interference: the adjustment of a single blendshape "slider" may degrade the effects obtained with previous slider movements, because the blendshapes have overlapping, non-orthogonal effects. Because models used in commercial practice may have 100 or more individual blendshapes, the interference problem is the subject of considerable manual effort. Modelers iteratively resculpt models to reduce interference where possible, and animators must compensate for those interference effects that remain. In this short paper we consider the blendshape interference problem from a linear algebra point of view. We find that while full orthogonality is not desirable, the goal of preserving previous adjustments to the model can be effectively approached by allowing the user to temporarily designate a set of points as representative of the previous (desired) adjustments. We then simply solve for blendshape slider values that mimic desired new movement while moving these "tagged" points as little as possible. The resulting algorithm is easy to implement and demonstrably reduces cases of blendshape interference found in existing models. © 2005 ACM.

关键词： Motion control

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