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Proceedings. Computer Graphics International (Cat. No.98EX149)

26-26 June 1998

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Displaying Results 1 - 25 of 96
  • Proceedings. Computer Graphics International (Cat. No.98EX149)

    Publication Year: 1998
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    Freely Available from IEEE
  • An anti-aliasing method for parallel rendering

    Publication Year: 1998, Page(s):228 - 235
    Cited by:  Papers (1)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (165 KB)

    We describe a parallel rendering method based on the adaptive supersampling technique to produce anti-aliased images with minimal memory consumption. Unlike traditional supersampling methods, this one does not supersample every pixel, but only those edge pixels. We consider various strategies to reduce the memory consumption in order for the method to be applicable in situations where limited or f... View full abstract»

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  • Author index

    Publication Year: 1998, Page(s):798 - 800
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    Freely Available from IEEE
  • The Styria Flyover-LOD management for huge textured terrain models

    Publication Year: 1998, Page(s):444 - 454
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1852 KB)

    With the Styria Flyover one can virtually fly over Styria, a province of Austria. The countryside is characterized by a mixture of rather flat regions in the south east and mountains up to 3000 m in the north west. The digital model covers Styria and parts of its adjoining provinces (30,000 km2); it is based on a DTM consisting of more than 23 million triangles and on 50 Mbyte texture d... View full abstract»

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  • Digital robbery; authors are not unprotected

    Publication Year: 1998, Page(s):558 - 563
    Cited by:  Papers (1)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (48 KB)

    The growth of networked systems has magnified the use of raw resources such as images, animations, videos, etc. The networking facilities between different systems and the lack of security between them have introduced the need for image, animation and video copyright protection. One approach used to address this problem is the use of structure that can seal or mark any digital material. These stru... View full abstract»

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  • Polyhedral approximation and first order segmentation of unstructured point sets

    Publication Year: 1998, Page(s):433 - 441
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1384 KB)

    The paper is concerned with the first two steps in a surface reconstruction process. Given a set of 3D points sampled from a physical model the first problem is that of creating a polyhedral approximation of the model. For that the authors introduce an algorithm which extends Boissonnat's (1984) work. It allows the reconstruction of objects with arbitrary genus and proposes an automatic terminatio... View full abstract»

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  • Using physics based models in virtual reality for dynamic emulation of robotic systems

    Publication Year: 1998, Page(s):388 - 390
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    This paper describes the work of an on-going project investigating the incorporation of physics-based modeling for simulating dynamic interactions in robotic aided manipulations. The research aims at achieving better simulation of robot behaviors in real situations, making it a useful tool for off-line programming. By allowing manipulation strategy simulation and performance visualization of a des... View full abstract»

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  • Hierarchical meshes for volume data

    Publication Year: 1998, Page(s):761 - 769
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (916 KB)

    An algorithm for adaptive refinement of 3D meshes is presented. This algorithm can be applied for the generation of mesh hierarchies used for efficient volume visualization algorithms, e.g. iso-surface extraction or direct volume rendering, as well as for multilevel finite element computations. The aim was to construct an algorithm which generates as few congruence classes as possible. The main id... View full abstract»

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  • Efficient and reliable triangulation of polygons

    Publication Year: 1998, Page(s):633 - 643
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    The author discusses a triangulation algorithm that is based on repeatedly clipping ears of a polygon. The main focus of the work was on designing an algorithm that is (1) completely reliable, (2) easy to implement, and (3) fast in practice. The algorithm was implemented in ANSI C, based on floating-point arithmetic. Due to a series of heuristics that get applied as a back-up for the standard ear-... View full abstract»

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  • Robust tessellation of trimmed rational B-spline surface patches

    Publication Year: 1998, Page(s):543 - 555
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    We present an unstructured triangular mesh generation algorithm that approximates a set of mutually non-intersecting simple trimmed rational B-spline surface patches within a user specified geometric tolerance. The proposed method uses numerically robust interval geometric representations/computations and also addresses the problem of topological consistency (homeomorphism) between the exact geome... View full abstract»

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  • On polyhedral approximations to a sphere

    Publication Year: 1998, Page(s):426 - 432
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The authors investigate methods by which successive approximations to a sphere can be generated from polyhedra. Each approximation can be obtained by bevel-cutting each edge of the previous approximation with a plane tangent to the sphere. They show that each member of the sequence of polyhedra can be associated with a Voronoi tessellation of the sphere. Under this formulation, the bevel-cutting o... View full abstract»

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  • Tailor made dynamic programming for edge matching

    Publication Year: 1998, Page(s):700 - 705
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The authors present an edge pixel matching algorithm based on dynamic programming. Unlike classical dynamic programming methods, where a path is searched for across a graph of the whole space of edge pixels, the approach allows the optimal path to be within a constrained search space, and thus tremendously cutting off the searching time. The knowledge of the camera parameters lends itself to reduc... View full abstract»

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  • An architecture of a universal DBMS for graphics applications

    Publication Year: 1998, Page(s):373 - 385
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    This paper presents a new architecture of a database management system intended to be used together with existing graphics software. In the first place, a system with this architecture shall be capable of coping with the large variety of data representations typically found in the graphics domain. Data is stored in its original form, without prior conversions, thus conserving the maximum informati... View full abstract»

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  • Deformable surfaces for feature based indirect volume rendering

    Publication Year: 1998, Page(s):752 - 760
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The authors present an indirect volume visualization method, based on the deformable surface model, which is a three dimensional extension of the snake segmentation method. In contrast to classical indirect volume visualization methods, this model is not based on iso-values but on boundary information. Physically speaking it simulates a combination of a thin plate and a rubber skin, that is influe... View full abstract»

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  • Interactive exploration of distributed 3D databases over the Internet

    Publication Year: 1998, Page(s):324 - 335
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (72 KB)

    Interactive 3D visualization and Internet-based access to information are already common. Their combination is-or soon will be-the primary vehicle for accessing remote databases in fundamental areas of manufacturing, architecture, petroleum, urban planning, tourism, defense, medicine, electronic commerce, and entertainment. Unfortunately, whether based on precise 3D geometry or involving combinati... View full abstract»

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  • Performing 3D scene and animation authoring tasks efficiently: an innovative approach

    Publication Year: 1998, Page(s):242 - 244
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (36 KB)

    3D animation is becoming a key technology in application areas such as information visualization, telecommunications or teaching and training systems. In addition, the application potential of 3D animation is growing due to innovations like VRML. The authoring of 3D scenes and animations is, therefore, increasingly becoming a task in areas other than its classical application areas, entertainment ... View full abstract»

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  • Automatic creation of flexible antropomorphic models for 3D videoconferencing

    Publication Year: 1998, Page(s):520 - 527
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1924 KB)

    The contribution describes the automatic creation of highly realistic flexible 3D models of participants for distributed 3D videoconferencing systems. The proposed technique uses a flexible mesh template surrounding an interior skeleton structure, which is based on a simplified human skeleton. The vertices of this template are arranged in rigid rings along the bones of the skeleton. Using 3D data ... View full abstract»

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  • Improved triangular subdivision schemes

    Publication Year: 1998, Page(s):626 - 632
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2536 KB)

    The authors improve the butterfly and Loop's (1987) algorithm. As a result they obtain subdivision algorithms for triangular nets which can be used to generate G1- and G2-surfaces, respectively View full abstract»

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  • VEplatform: a base system for distributed virtual reality

    Publication Year: 1998, Page(s):568 - 569
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (20 KB)

    The VEplatform project aims at the development of a highly scalable system which allows distributed virtual reality applications to be built. The system is decentralised i.e. there is no central component which controls it and which can become a bottleneck. At this moment VEplatform is already a working system allowing many participants to join a virtual world. In this article the software archite... View full abstract»

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  • Using scattered data interpolation for radiosity reconstruction

    Publication Year: 1998, Page(s):715 - 720
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The authors present an analysis of the impacts of different interpolation methods on the reconstruction of the radiosity function across a patch. Two groups of methods are compared: one group based on regular grids and the other based on adaptive patch subdivisions. They handle points on adaptive subdivisions as scattered data points which opens the field of scattered data interpolation. Visual an... View full abstract»

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  • Uncertainty coding and controlled data reduction using fuzzy-B-splines

    Publication Year: 1998, Page(s):536 - 542
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    In this paper, a method is described for the representation and reconstruction of single-valued surfaces given as sets of measured data, which may be uncertain as well as crisp. In the case of imprecise data, the fuzzy B-spline representation is able to keep track of uncertainty and provide tools for interrogating the model at prescribed presumption levels. In both cases, a very high degree of com... View full abstract»

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  • Towards an understanding of surfaces through polygonization

    Publication Year: 1998, Page(s):416 - 425
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    We identify some of the major problems in polygonizing parametric surfaces. We are interested in associating an error with a polygonization which tells us how well we have done, rather than judging a surface by its looks alone. We introduce an error measurement which is more intuitive and helps to understand the surface View full abstract»

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  • CVP: recognizable and hierarchical 3D overviews of the WWW by persistence directory placement

    Publication Year: 1998, Page(s):404 - 410
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    The CVP Cyberspace Visualization Project addresses interactive overview visualizations of Web spaces for enhancing orientation, navigation and communication when browsing or searching the WWW. This paper presents a collection of requirements which such visualizations should fulfil. An algorithm is described generating recognizable, hierarchically structured views of interconnected Web objects. The... View full abstract»

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  • Geometric- and parametric-tolerance constraints in variational design of multiresolution curves and surfaces

    Publication Year: 1998, Page(s):688 - 698
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The paper introduces constraints termed tolerance constraints, which specify several types of variations, in the design of smooth curves and surfaces at multiresolution levels. The mathematical model for such tolerance constraints is implemented by extending Welch and Witkin's (1992) work on linear constraints in variational shape sculpting. The tolerance constraints presented in this paper are cl... View full abstract»

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  • Hierarchical decomposition of datasets on irregular surface meshes

    Publication Year: 1998, Page(s):59 - 63
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    We introduce multiresolution analysis (MRA) algorithms intended to be used in scientific visualization, and based on a non-nested set of approximating spaces. The need for non-nested spaces arises from the fact that the required scaling functions do not fulfil any refinement equation. Therefore we introduce in the first part the concept of the approximated refinement equation, that allows to gener... View full abstract»

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