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

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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Modeling surfaces of arbitrary topology using manifolds 95

Modeling surfaces of arbitrary topology using manifolds

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Proceedings of the 22nd Annual ACM Conference on computer graphics and Interactive Techniques

作者： Grimm, Cindy M. Hughes, John F. The Science and Technology Center for Computer Graphics and Scientific Visualization

ISBN: (纸本)9780897917018

We describe an extension of B-splines to surfaces of arbitrary topology, including arbitrary boundaries. The technique inherits many of the properties of B-splines: local control, a compact representation, and guaranteed continuity of arbitrary degree. The surface is specified using a polyhedral control mesh instead of a rectangular one;the resulting surface approximates the polyhedral mesh much as a B-spline approximates its rectangular control mesh. Like a B-spline, the surface is a single, continuous object. This is achieved by modeling the domain of the surface with a manifold whose topology matches that of the polyhedral mesh, then embedding this domain into 3-space using a basis-function/control-point formulation. We provide a constructive approach to building a manifold.

关键词： computer graphics

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Liquid 2D Scatter Space for file system browsing

Liquid 2D Scatter Space for file system browsing

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9th International Conference on Information Visualisation

作者： Waldeck, C Dept. Z3 (MIV: Mobile Information Visualization) Computer Graphics Center ZGDV Germany ZGDV Computer Graphics Center Dept. Z3 MIV (Mobile Information Visualization) 64283 Darmstadt Fraunhofer Str. 5 Germany

ISBN: (纸本)0769523978

This (video-) paper describes a user interface concept, which facilitates multidimensional visual queries, filtering and browsing of the file system at the same time by means of the "Liquid Scatter Space" (LSS) concept ([1] Waldeck 2004). The UI concept is based on an advanced star field display ([2] Ahlberg & Shneiderman 1994) using liquid browsing [1] and selection based (sketch-) queries. It allows realtime search and browsing at the same time (integrated into one single user interface) and can visualize the most important file system meta data dimensions simultaneously: 1. filename, 2. creation/modification date, 3. filesize, 4. filetype and 5. label. LSS provides very fast and easy visual data mining possibilities for the desktop and makes it possible to perceive complex dependencies between the most important file system meta data properties at a glance. It also overcomes the "hidden-deep-down-in-hierarchy-structures "-problem by making it possible to use folders for structuring but not being bound to them. This paper focuses on visual design and interaction aspects and emphasizes the importance of paying regard to visual interactive details for information visualization and interaction interfaces and the need of making it easy to use.

关键词： liquid browsing focus and context visual interactive information spaces mobile computing user interface design dynamic interactive visualization visual data mining file system browsing

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Delocalized unsteady vortex region detectors

Delocalized unsteady vortex region detectors

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13th International Fall Workshop Vision, Modeling, and visualization 2008, VMV 2008

作者： Fuchs, Raphael Peikert, Ronald Sadlo, Filip Alsallakh, Bilal Gröller, Meister Eduard Institute of Computer Graphics and Algorithms TU Vienna Austria VRVis Research Center for Virtual Reality and Visualization Vienna Austria Computer Graphics Laboratory ETH Zurich Switzerland

ISBN: (纸本)9781586039219

In this paper we discuss generalizations of instantaneous, local vortex criteria. We incorporate information on spatial context and temporal development into the detection process. The presented method is generic in so far that it can extend any given Eulerian criterion to take the Lagrangian approach into account. Furthermore, we present a visual aid to understand and steer the feature extraction process. We show that the delocalized detectors are able to distinguish between connected vortices and help understanding regions of multiple interacting vortex structures. The delocalized detectors extract smoother structures and reduce noise in the vortex detection result.

关键词： Vortex flow

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A context-oriented RDF Database 1

A context-oriented RDF Database

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1st International Conference on Semantic Web and Databases, SWDB 2003

作者： Tazari, Mohammad-Reza Computer Graphics Center Dept. Mobile Information Visualization Fraunhoferstraße 5 Darmstadt64283 Germany

The importance of contextual knowledge in knowledge management and organizational memory is shown in topical literature. Even in an initial visionary scenario for the Semantic Web, one can immediately encounter the contextual knowledge needed to realize the necessary services. Hence, it is not inappropriate to claim that context management is an integral service of the Semantic Web. After discussing the distributed nature of contextual knowledge, we define some requirements for a context-oriented database service and then introduce CORD as a service satisfying those requirements based on the Semantic Web technologies. Selected features of CORD that provide some contribution to the discussions within the Semantic Web research community, like embedded resources, query language, and definition of rules, are discussed in some detail.

关键词： Query languages

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On-line boosting for car detection from aerial images

On-line boosting for car detection from aerial images

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2007 IEEE International Conference on Research, Innovation and Vision for the Future, RIVF 2007

作者： Nguyen, Thuy Thi Grabner, Helmut Bischof, Horst Gruber, Barbara Institute for Computer Graphics and Vision Graz University of Technology Austria VRVis Research Center for Virtual Reality and Visualization Graz Austria

ISBN: (纸本)1424406943

In this paper, we present a new approach for automatic car detection from aerial images. The system exploits a robust machine learning method known as boosting for efficient car detection from high resolution aerial images. We propose to use on-line boosting with interactive training framework to efficiently train and improve the detector. We use integral images for fast computation of features. This also allows to perform exhaustive search for detection of cars after training. For post processing, we employ a mean shift clustering method, which improves the detection rate significantly. In contrast to related work, our framework does not rely on any priori knowledge of the image like a site-model or contextual information, but if necessary this information can be incorporated. An extensive set of experiments on high resolution aerial images using the new UltraCamD shows the superiority of our approach. © 2007 IEEE.

关键词： Tracking (position)

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Metropogis: A feature based city modeling system

Metropogis: A feature based city modeling system

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2002 International Symposium of ISPRS Commission III on Photogrammetric computer Vision, PCV 2002

作者： Bauer, Joachim Klaus, Andreas Karner, Konrad Zach, Christopher Schindler, Konrad VRVis Research Center for Virtual Reality and Visualization United States Institute for Computer Graphics and Vision Graz University of Technology Austria

In this paper we report on a system to extract 3D information from oriented digital facade images using various feature extraction/matching methods. We emphasize on 2D feature extraction from digital images including contour chains, line segments and vanishing points. The extraction of 3D primitives is based on line matching over multiple oriented views and 3D plane detection by a line grouping process. The MetropoGIS system is designed for the automatic extraction of 3D data from facade images. © 2002 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Feature extraction

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SKETCH: An interface for sketching 3D scenes 06

SKETCH: An interface for sketching 3D scenes

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2006 ACM SIGGRAPH Courses, SIGGRAPH 2006

作者： Zeleznik, Robert C. Herndon, Kenneth P. Hughes, John F. NSF Science and Technology Center for Computer Graphics and Scientific Visualization PO Box 1910 ProvidenceRI02912 United States

ISBN: (纸本)1595933646

Sketching communicates ideas rapidly through approximate visual images with low overhead (pencil and paper), no need for precision or specialized knowledge, and ease of low-level correction and revision. In contrast, most 3D computer modeling systems are good at generating arbitrary views of precise 3D models and support high-level editing and revision. The SKETCH application described in this paper attempts to combine the advantages of each in order to create an environment for rapidly conceptualizing and editing approximate 3D scenes. To achieve this, SKETCH uses simple non-photorealistic rendering and a purely gestural interface based on simplified line drawings of primitives that allows all operations to be specified within the 3D world.

关键词： Three dimensional computer graphics

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Metropogis: A semi-automatic city documentation system

Metropogis: A semi-automatic city documentation system

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2002 International Symposium of ISPRS Commission III on Photogrammetric computer Vision, PCV 2002

作者： Klaus, Andreas Bauer, Joachim Karner, Konrad Schindler, Konrad VRVis Research Center for Virtual Reality and Visualization United States Institute for Computer Graphics and Vision Graz University of Technology Austria

In this paper we report on a new system to enhance a 3D block model of a real city with terrestrial measured data of the facades. The terrestrial data consists of photographs taken by a hand-held digital consumer camera using short baselines. The relative orientation of the photographs is calculated automatically and fitted towards the 3D block model with minimized human input using vanishing points. The introduced city documentation system delivers a fully 3D geographic information data set and is called MetropoGIS. © 2002 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Geographic information systems

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Skin: A constructive approach to modeling free-form shapes 99

Skin: A constructive approach to modeling free-form shapes

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26th Annual Conference on computer graphics and Interactive Techniques, SIGGRAPH 1999

作者： Markosian, Lee Cohen, Jonathan M. Crulli, Thomas Hughes, John Brown University Site of the NSF Technology Center for Computer Graphics and Scientific Visualization Box 1910 ProvidenceRI02912 United States

ISBN: (纸本)0201485605

We present a new particle-based surface representation with which a user can interactively sculpt free-form surfaces. The particles maintain mesh connectivity and operate under rules that lead them to form triangulations with properties that make them suitable for use in subdivision. A user interactively guides the particles, which we call skin, to grow over a given collection of polyhedral elements (or skeletons), yielding a smooth surface (through subdivision) that approximates the underlying skeletal shapes. Skin resembles blobby modeling in the constructive approach to modeling it supports, but allows a richer vocabulary of skeleton shapes, supports sharp creases where desired, and provides a convenient mechanism for adding multiresolution surface detail. Copyright ACM 1999.

关键词： Musculoskeletal system

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