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Metamorphosis of planar parametric curves via curvature interpolation

International Journal of Shape Modeling 2002年第2期8卷 201-216页

作者： Surazhsky, Tatiana Elber, Gershon Ctr. Graphics Geometric Computing Applied Mathematics Dept. Technion Israel Institute of Technology Haifa 32000 Israel Ctr. Graphics Geometric Computing Faculty of Computer Science Technion Israel Institute of Technology Haifa 32000 Israel

This work considers the problem of metamorphosis interpolation between two freeform planar curves. Given two planar parametric curves, the curvature signature of the two curves is linearly blended, yielding a gradual change that is not only smooth but also employs intrinsic curvature shape properties, and hence is highly appealing. In order to be able to employ this curvature blending, we present a constructive scheme to derive curvature signatures of parameter curves. Additionally, we propose a scheme to reconstruct a curve from its curvature signature.

关键词： Computational geometry

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Programming Satan's agents

Programming Satan's agents

引用

SEMAS 2001, First International Workshop on Security of Mobile Multiagent System

作者： Roth, Volker Fraunhofer Institute for Computer Graphics Dept. Security Technology Rundeturmstrasse 6 64283 Darmstadt Germany

Mobile agent security is still a young discipline and most naturally, the focus up to the time of writing was on inventing new cryptographic protocols for securing various aspects of mobile agents. However, past experience shows that protocols can be flawed, and flaws in protocols can remain unnoticed for a long period of time. The game of breaking and fixing protocols is a necessary evolutionary process that leads to a better understanding of the underlying problems and ultimately to more robust and secure systems. Although, to the best of our knowledge, little work has been published on breaking protocols for mobile agents, it is inconceivable that the multitude of protocols proposed so far are all flawless. As it turns out, the opposite is true. We identify flaws in protocols proposed by Corradi et al., Karjoth et al., and Karnik et al., including protocols based on secure coprocessors. Additionally, we propose how the protocols can be strengthened against the types of attacks we launch against them. © 2001 Published by Elsevier Science B.V.

关键词： computer systems programming

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Programming Satan's Agents

引用

Electronic Notes in Theoretical computer Science 2002年 63卷 124-139页

作者： Volker Roth Fraunhofer Institute for Computer Graphics Dept. Security Technology Rundeturmstrasse 6 64283 Darmstadt

Mobile agent security is still a young discipline and most naturally, the focus up to the time of writing was on inventing new cryptographic protocols for securing various aspects of mobile agents. However, past experience shows that protocols can be flawed, and flaws in protocols can remain unnoticed for a long period of time. The game of breaking and fixing protocols is a necessary evolutionary process that leads to a better understanding of the underlying problems and ultimately to more robust and secure systems. Although, to the best of our knowledge, little work has been published on breaking protocols for mobile agents, it is inconceivable that the multitude of protocols proposed so far are all flawless. As it turns out, the opposite is true. We identify flaws in protocols proposed by Corradi et al ., Karjoth et al ., and Karnik et al ., including protocols based on secure coprocessors. Additionally, we propose how the protocols can be strengthened against the types of attacks we launch against them.

关键词： mobile agent security breaking security protocols

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Preface

引用

Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2001年 2037卷 V-VI页

作者： Boers, Egbert J. W. Cagnoni, Stefano Gottlieb, Jens Hart, Emma Lanzi, Pier Luca Raidl, Günther R. Smith, Robert E. Tijink, Harald Leiden Institute of Advanced Computer Science Leiden University Niels Bohrweg 1 Leiden Netherlands Dept. of Computer Engineering University of Parma Parco Area delle Scienze 181/a Parma Italy SAP AG Neurottstrasse 16 Walldorf Germany Napier University School of Computing 219 Colinton Road Edinburgh United Kingdom Polytechnic of Milan Piazza Leonardo da Vinci 32 Milan Italy Algorithms and Data Structur es Group Institute of Computer Graphics Vienna University of Technology Favoritenstrasse 9-11/186 Vienna Austria The Intelligent Computer Systems Centre The University of The West of England Coldharbour Lane Frenchay Bristol United Kingdom Data and Knowledge Systems Department National Aerospace Laboratory NLR P.O. Box 153 Emmeloord Netherlands

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New engineering faculty for the new millennium

New engineering faculty for the new millennium

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2000 ASEE Annual Conference and Exposition: Engineering Education Beyond the Millenium

作者： Homkes, Rick Morales, Carlos R. Rowe, Kenneth E. Smith, Mark L. Purdue University Department of Computer Technology Purdue University School of Technology Site Kokomo IN Dept. of Computer Technical Graphics Purdue University School of Technology Site Kokomo IN Computer Technology Department Purdue University's School of Technology West Lafayette IN Department of Computer Technology Purdue University North Central Westville IN

Three new faculty members team up to relate their experiences moving from industry to academia. Major topics include teaching, laboratory development, service, publishing, and the balancing of time among these areas. The teaching area includes incorporating industrial experiences into classroom preparation and making the transition from industrial presentations to academic teaching. Bloom's taxonomy is used to prepare for teaching and also to assess learning. Laboratory development includes making that first contact with prospective industrial partners and writing a grant proposal. The service area includes not just the committee work upon which academia thrives, but also outreach activities to the community. This outreach includes both working as a consultant and reaching out to possible new students. Publishing includes the research and preparation of a first paper for conference presentation along with the relative worth of different venues for a published paper. Finally, the fourth member of the team, one who made the move from industry eight years ago, describes how to put these activities into a winning promotion and tenure document. Insights are given into the promotion and tenure process and the various committees that are involved in this process. This document and process are important because it is necessary to not only to become active in all the areas listed above, but also to document these activities in order to achieve tenure and stay in academia.

关键词： Engineering education

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Automated camera calibration and 3D egomotion estimation for augmented reality applications 7th

Automated camera calibration and 3D egomotion estimation for...

引用

7th International Conference on computer Analysis of Images and Patterns, CAIP 1997

作者： Koller, Dieter Klinker, Gudrun Rose, Eric Breen, David Whitaker, Ross Tuceryan, Mihran Munich81925 Germany EE Dept. California Inst. of Technology MC 136-93 PasadenaCA91125 United States Autodesk Inc. 2465 Latham St. Suite 101 Mountain ViewCA94040 United States Computer Graphics Lab. California Inst. of Technology MC 348-74 PasadenaCA91125 United States EE Dept. 330 Fen-is Hall U. of Tennessee KnoxvilleTN37996-2100 United States Dept of Comp and Info Science IUPUI 723 W. Michigan St IndianapolisIN46202-5132 United States

ISBN: (纸本)3540634606

This paper addresses the problem of accurately tracking the 3D motion of a monocular camera in a known 3D environment and dynamically estimating the 3D camera location. For that purpose we propose a fully automated landmark based camera calibration method and initialize a motion estimator, which employes extended Kalman filter techniques to track landmarks and to estimate the camera location at any given time. The implementation of our approach has been proven to be efficient and robust and our system successfully tracks in real-time at approximately 10 Hz. We show tracking results of various augmented reality scenarios. © Springer-Verlag Berlin Heidelberg 1997.

关键词： Augmented reality

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Performance of the H.263 Video Compression Standard

引用

Journal of VLSI Signal Processing Systems for Signal, Image, and Video technology 1997年第2-3期17卷 101-111页

作者： Girod, Bernd Steinbach, Eckehard Färber, Nikolaus Telecommunications Institute University of Erlangen-Nuremberg 91058 Erlangen Cauerstrasse 7 Germany Georgia Institute of Technology United States University of Hannover Germany Inst. F. Theor. N. University of Hannover Germany Massachussetts Inst. of Technology Cambridge MA United States Research Laboratory of Electronics United States Department of Media Technology Media Laboratory Germany Department of Computer Graphics Germany Academy of Media Arts Cologne Germany Computer Science Section Cologne University Germany Digital Signal Processing Group Georgia Institute of Technology Atlanta GA United States Dept. of Elec. Eng./Telecom. University of Erlangen-Nuremberg Germany Telecommunications Institute Germany Vivo Software Inc. Waltham MA United States University of Karlsruhe Germany University of Essex United Kingdom ESIEE Paris France Image Communication Group Telecommunications Institute University of Erlangen-Nuremberg Germany University of Munich Germany Telecommunications Institute University of Erlangen-Nuremberg Germany Image Communication Group

The draft international standard ITU-T H.263 is closely related to the well known and widely used ITU-T Recommendation H.261. However, H.263 does provide the same subjective image quality at less than half the bit-rate. In this paper we investigate to what extend single enhancements of H.263 contribute to this performance gain, and consider the trade-off quality vs. complexity. Based on typical test sequences, H.263 with its various modes is compared to H.261 on the basis of rate distortion curves at bit-rates up to 128 kbps. At 64 kbps, the performance gain of H.263 in its default mode compared to H.261 is approximately 2 dB. This improvement is achieved with only little increase of complexity, and is mainly due to more accurate motion compensation with half-pel accuracy. Considering the trade-off quality vs. complexity, the combination of the optional coding-modes "Advanced prediction mode" and "PB-frames mode" is a good compromise, resulting in an additional performance gain of 1.5 dB PSNR at 64 kbps. The "Syntax-based arithmetic coding mode" on the other hand, offers only a very small performance gain (0.1 dB at 64 kbps) for its increased computational complexity. Results from profiling an H.263 software codec are presented in order to support complexity considerations of the optional coding-modes.

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Polyhedra generation from lattice points 6th

引用

6th International Workshop on Discrete Geometry for computer Imagery, DGCI 1996

作者： Kenmochi, Yukiko Imiya, Atsushi Ezquerra, Norberto F. Dept. of Information and Computer Sciences Chiba University 1-33 Yayoi-cho Inage-kuChiba263 Japan Graphics Visualization and Usability Center College of Computing Georgia Institute of Technology 801 Atlantic Drive AtlantaGA30332-0280 United States

ISBN: (纸本)9783540620051

This paper focuses on a method for generating polyhedra from a set of lattice points, such as three-dimensional (3D) medical computerized tomography images. The method is based on combinatoriM topology [1] and algebraic properties of the 3D lattice space [2]. It is shown that the method can uniquely generate polyhedra from a subset of the lattice space independently of the choice of neighborhood. Furthermore, a practical algorithm is developed and experimental results using 3D medical imagery are presented. © Springer-Verlag Berlin Heidelberg 1996.

关键词： Topology

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Scientific and artistic investigation of multi-dimensional fractals on the AT & T pixel machine

引用

The Visual computer 1993年第7期9卷 346-355页

作者： Hart, John C. Lescinsky, Gordon W. Sandin, Daniel J. DeFanti, Thomas A. Kauffman, Louis H. School of EECS Washington State University Pullman 99/64-2752 WA United States Advanced Computer Graphics Centre Royal Melbourne Institute of Technology Victoria Melbourne Australia Electronic Visualization Laboratory EECS Dept. M/C 154 University of Illinois at Chicago Chicago 60680-4348 IL United States

The pipelined architecture and parallel organization of the AT&T Pixel Machine image computer are described and demonstrated with applications for the visualization of multidimensional fractals, particularly linear fractals and quaternion/ stacked Julia sets. Techniques for pushing the Pixel Machine to its peak abilities are described and apply to more recent parallel image computers as well. © 1993 Springer-Verlag.

关键词： Fractals Parallelism

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Applications of Evolutionary Computing 1

引用

丛书名： Lecture Notes in computer Science

1000年

作者： Stefano Cagnoni Colin G. Johnson Juan J. Romero Cardalda Elena Marchiori David W. Corne Jean-Arcady Meyer Agnès Guillot Jens Gottlieb Martin Middendorf Günther R. Raidl Emma Hart

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