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Proceedings of the 5th International conference on Virtual Reality, Archaeology and Intelligent Cultural Heritage

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

ISBN: (纸本)9783905673180

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 re-using 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.

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Digitisation to Presentation - Building Virtual Museum Exhibitions 1

Digitisation to Presentation - Building Virtual Museum Exhib...

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1st International Conference on Institute of Mathematics and its Applications Vision, Video, and graphics, VVG 2003

作者： Patel, Manjula White, Martin Walczak, Krzysztof Sayd, Patrick UKOLN University of Bath United Kingdom Centre for VLSI and Computer Graphics University of Sussex United Kingdom Department of Information Technology The Poznan University of Economics Poznan Poland Image and Embedded Computers Laboratory Commissariat À l'Energie Atomique France

ISBN: (纸本)3905673541

We describe an innovative system designed for museums to create, manage and present multimedia based representations of museum artefacts in virtual exhibitions both inside and outside museums. Our system creates digital surrogates through a novel stereo photogrammetry system with little user interaction. The resulting 3D objects are refined using state-of-the-art 3D modelling software configured for ease of use by museum staff. A repository of such digital surrogates is managed in an XML enabled relational database and provides the basis for the creation and presentation of virtual museum exhibitions, allowing current museum websites to evolve from a 2D to a 3D multimedia-rich domain. In this paper, we discuss the modelling and refinement processes which are based on stereo photogrammetry and the creation and visualisation of virtual museum exhibitions using virtual and augmented reality techniques. © The Eurographics Association 2003.

关键词： Exhibitions

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QuadTIN: quadtree based triangulated irregular networks

QuadTIN: quadtree based triangulated irregular networks

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IEEE Conference on Visualization

作者： R. Pajarola M. Antonijuan R. Lario Computer Graphics Laboratory Information & Computer Science Department University of California Irvine USA School of Engineering Multimedia Technology Integration Center School of Engineering Departmento Arquitectura de Computadores y Automática Faculty de CC. Físicas Universidad Complutense de Madrid Spain

Interactive visualization of large digital elevation models is of continuing interest in scientific visualization, GIS, and virtual reality applications. Taking advantage of the regular structure of grid digital elevation models, efficient hierarchical multiresolution triangulation and adaptive level-of-detail (LOD) rendering algorithms have been developed for interactive terrain visualization. Despite the higher triangle count, these approaches generally outperform mesh simplification methods that produce irregular triangulated network (TIN) based LOD representations. In this project we combine the advantage of a TIN based mesh simplification preprocess with high-performance quadtree based LOD triangulation and rendering at run-time. This approach, called QuadTIN, generates an efficient quadtree triangulation hierarchy over any irregular point set that may originate from irregular terrain sampling or from reducing oversampling in high-resolution grid digital elevation models.

关键词： Tin Digital elevation models Data visualization computer graphics Geographic information Systems Virtual reality Rendering (computer graphics) Strips computer science Application software

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Virtual colon flattening

Virtual colon flattening

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3rd Joint Eurographics - IEEE TCVG Symposium on Visualization, VisSym 2001

作者： Bartrolí, A. Vilanova Wegenkittl, R. König, A. Gröller, E. Sorantin, E. Institute of Computer Graphics and Algorithms Vienna University of Technology Tiani Medgraph Section of Digital Information and Image Processing Department of Radiology University Hospital Graz Austria

ISBN: (纸本)3211836748

We present a new method to visualize virtual endoscopic views. We propose to flatten the organ by the direct projection of the surface onto a set of cylinders. Two sampling strategies are presented and the introduced distortions are studied. A non-photorealistic technique is presented to enhance the perception of the images. Finally, an approximate but real-time endoscopic fly-through is possible by using the data obtained by the projection technique. © 2001 Eurographics Association. All rights reserved.

关键词： Image enhancement

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MIT educators share success

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computer graphics (ACM) 2001年第1期35卷 20-23页

作者： Wolfe, Rosalee Belcher, John W. Mark Bessette, R. Massachusetts Institute of Technology Astrophysics Division MIT Physics Department Studio/TEAL Project MIT New England 3D Studio Max Users Group Physics Demonstration Group MIT Department of Physics Center for Space Research Massachusetts Institute of Technology Center for Educational Computing Initiatives Massachusetts Institute of Technology Division of Graphics and Human-Computer Interaction School of Computer Science Telecommunications and Information Systems DePaul University School of Computer Science DePaul University Chicago IL 60604

Professor John Belcher developed a series of short videos with animation and text of selected experiments to properly demonstrate the phenomena of electromagnetism. Such 3D animations are visually compelling, instilling in the student both a sense of wonder about the phenomena and a mental model of why and how it works. The products of these approach includes video clips of demonstrations, 3D animations of these demonstration which display time changing field-lines as a guide to understanding their dynamical effects and Java applets which allow the student to actively construct and animate 2D field lines for varying configurations of sources. These technologies are also implemented to develop animations for Faraday's insights, using video clips.

关键词： computer graphics

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Compressed progressive meshes (vol 6, pg 79, 2000)

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IEEE TRANSACTIONS ON VISUALIZATION AND computer graphics 2000年第2期6卷 190-192页

作者： Pajarola, R Rossignac, J Information and Computer Science Department University of California Irvine Graphics Visualization and Usablity Center Georgia Institute of Technology

Most systems that support visual interaction with 3D models use shape representations based on triangle meshes. The size of these representations imposes limits on applications for which complex 3D models must be accessed remotely. Techniques for simplifying and compressing 3D models reduce the transmission time. Multiresolution formats provide quick access to a crude model and then refine it progressively. Unfortunately, compared to the best nonprogressive compression methods, previously proposed progressive refinement techniques impose a significant overhead when the full resolution model must be downloaded. The CPM (Compressed Progressive Meshes) approach proposed here eliminates this overhead. It uses a new technique, which refines the topology of the mesh in batches, which each increase the number of vertices by up to 50 percent. Less than an amortized total of 4 bits per triangle encode where and how the topological refinements should be applied. We estimate the position of new vertices from the positions of their topological neighbors in the less refined mesh using a new estimator that leads to representations of vertex coordinates that are 50 percent more compact than previously reported progressive geometry compression techniques.

关键词： Triangle mesh compression Progressive Meshes Multiresolution Modeling Geometry Compression

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Virtual hand interactions with 3D world 4

Virtual hand interactions with 3D world

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4th International Conference on Multi-Media Modeling, MMM 1997

作者： Moccozet, L. Huang, Z. Magnenat Thalmann, N. Thalmann, D. MIRALab-CUI University of Geneva 24 Rue Géńral Dufour Geneva 4CH 1211 Switzerland Computer Graphics Laboratory Swiss Federal Institute of Technology LausanneCH 1015 Switzerland Department of Information Systems and Computer Science National University of Singapore Singapore119260 Singapore

ISBN: (纸本)9810233515

Interactions between a virtual actor and its virtual environment involve many aspects. An important one is hands interactions. In a virtual scene depicting everyday life, the actor will need to grasp and hold objects, in such a way that both skeleton motion and body deformation have a realistic visual aspect. It will also need to interact with other virtual actors sharing the same virtual world, shaking hands when meeting for example. We present an efficient and realistic method combining automatic hand motion generation with hand deformation simulation. The resulting system is integrated in an interactive human simulation application. It adds the ability to simulate hand interactions between actors and their environment, in combination with traditional human animation techniques. The skeleton is animated by a heuristic motion control and multi-sensor based technique. The final free-form surface hand model is produced by a three-layer deformation model. The intermediate muscular layer is based on a geometric deformation tool, where deformations are coasidered as interpolating control points displacements. © Multimedia Modeling, MMM 1997 - Modeling Multimedia information and Systems. All rights reserved.

关键词： Deformation

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Parallel programming with CAPSE-a case study

Parallel programming with CAPSE-a case study

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Euromicro Workshop on Parallel and Distributed Processing

作者： B. Gruber G. Haring D. Kranzlmuller J. Volkert Institute of Applied Computer Science and Information Systems Department of Advanced Computer Engineering University of Technology Vienna Vienna Austria Institute of Computer Science Department for Graphics and Parallel Processing Johannes Kepler University Linz Linz Austria

The CAPSE environment for computer Aided Parallel Software Engineering is intended to assist the developer in the crucial task of parallel programming. The methodology of CAPSE is based on direct manipulative graphical creation and editing of scalable workload characterizations of MIMD algorithms. This paper presents the basic concepts of this methodology and an example of a parallel Poisson solver. The workload characterization representing the computation and communication behavior of the algorithm is based on directed acyclic task graphs, which achieve scalability by composing the task graph of scalable basic patterns instead of single node and arcs. The composition and the usage of these basic patterns is described in the light of designing the Poisson solver algorithm. The resulting task graph is used to predict the program's performance on a nCUBE 2 distributed memory machine and the PAPS simulator.

关键词： Parallel programming computer aided software engineering Concurrent computing computer science information systems Scalability Distributed computing computer graphics Parallel processing Algorithm design and analysis

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Empirically evaluating the use of animations to teach algorithms

Empirically evaluating the use of animations to teach algori...

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IEEE Symposium on Visual Languages

作者： A.W. Lawrence A.M. Badre J.T. Stasko Department of Computer and Information Sciences Spelman College Atlanta GA USA Graphics Visualization and Usability Center Georgia Institute of Technology College of Computing Georgia Institute of Technology Atlanta GA USA

As algorithm animation systems become more widely available and easy to use, instructors will have the opportunity to utilize these systems to assist their teaching. Although algorithm animation systems have generated excitement and interest in both teachers and students, little empirical evidence exists to promote their use. This article describes a study involving the use of algorithm animations in classroom and laboratory settings. Results indicated that allowing students to create their own examples in a laboratory session led to higher accuracy on a post-test examination of understanding as compared to students who viewed prepared examples or no laboratory examples.< >

关键词： Animation Laboratories Education Educational institutions Control systems Humans Educational technology graphics Data visualization Usability

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FAST ALGORITHM FOR COMPUTING FRACTAL DIMENSIONS OF IMAGE SEGMENTS

FAST ALGORITHM FOR COMPUTING FRACTAL DIMENSIONS OF IMAGE SEG...

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SATELLITE CONF AT THE 1988 BIANNUAL INTERNATIONAL CONF ON PATTERN RECOGNITION : RECENT ISSUES IN PATTERN ANALYSIS AND RECOGNITION

作者： CREUTZBURG, R IVANOV, E Central Institute of Cybernetics and Information Processes International Basic Laboratory for Image Processing and Computer Graphics Academy of Sciences of the G.D.R. Kurstr. 33 P. O. Box 1298 Berlin DDR - 1086 Germany Department of Information Techniques University of Technology Mommsenstr. 13 Dresden DDR - 8027 Germany

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