Volume 12 (1993): Recent submissions

Now showing items 1-20 of 62

    • Graphic Objects: A Mathematical Abstract Model for Computer Graphics 

      Torres, J.C.; Clares, B. (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper defines an abstract mathematical model for graphic systems which incorporates modelling operations. The model is based on the"graphic object" concept. A graphic object is an abstraction of a graphic entity. ...

    • A Multiprocessor Implementation of Radiosity 

      Ng, Adelene; Slater, Mel (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper describes a multi-processor implementation of form factor computation in the radiosity method. Form factors are computed using the ray casting method and the algorithm is enhanced with Binary Space Partition ...

    • A Fractal Method for Digital Elevation Model Construction and its Application to a Mountain Region 

      Brivio, Pietro Alessandro; Marini, Daniele (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper presents and discusses the results of a methodology for the construction of Digital Elevation Models (DEM), based on mathematical principles of fractal geometry. Classical approaches to DEM are founded on numerical ...

    • The Method of Dynamic Palette Construction in Realistic Visualization Systems 

      Voloboj, Aleksej G. (Blackwell Science Ltd and the Eurographics Association, 1993)
      The paper describes the colour approximation problem and the method of dynamic palette construction is suggested for its solution. The method uses the graphic display palette based on the computed true colour of the ...

    • ANIMA: An Interactive Tool for Scientific Data Animation 

      Moltedo, Laura; Morigi, Serena (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper describes an animation interactive system that produces image sequences used to study the numerical results of scientific simulations. The fundamental goal of the system is to provide an easy method for observing ...

    • A Library for Developing PHIGS Programming Tools in a PEX Environment 

      Wainer, Michael; Tan, Ting (Blackwell Science Ltd and the Eurographics Association, 1993)
      The merger of three-dimensional graphics with the X Window System has recently been standardized by adapting PHIGS, the Programmer s Hierarchical Interactive Graphics System, to the X Window System with PEX, the PHIGS ...

    • Spanning a C1-Surface over a Given Wireframe 

      Tokumasu, Shinji; Harashima, Ichirou; Nakajima, Norihiro (Blackwell Science Ltd and the Eurographics Association, 1993)
      A problem of spanning a surface of C1 continuity (C1-surface) over a given wireframe is introduced. By exploiting the concept of a super surface patch introduced in an earlier paper, we proved the existence of an approximate, ...

    • Ray Tracing an Octree: Numerical Evaluation of the First Intersection 

      Gargantini, I.; Atkinson, H. H. (Blackwell Science Ltd and the Eurographics Association, 1993)

    • The Determination of Form-Factors by Lookup Table 

      Sun, Jizhou; Zou, L.Q.; Grimsdale, R.L. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Current methods for computer image synthesis using the radiosity algorithm rely heavily on the calculation of geometrical properties, known as form-factors, which quantify the energy exchange between pairs of surfaces in ...

    • An Object Model for Multimedia Programming 

      Arbab, F.; Herman, I.; Reynolds, G.J. (Blackwell Science Ltd and the Eurographics Association, 1993)
      The development of multimedia applications is a complex task. Much of this complexity stems from requirements associated with programming multiple media objects and the control of dependences and inter-relationships between ...

    • Storage Support for Multidimensional Discrete Data in Multimedia Databases 

      Furtado, Paula; Teixeira, Jose Carlos (Blackwell Science Ltd and the Eurographics Association, 1993)
      Multidimensional discrete data (MDD) is enormously important for multimedia applications since diverse types of such data are used simultaneously by any multimedia application. However, multidimensional discrete data is ...

    • Using Multimedia to Support Cooperative Editing 

      Santos, A.; Tritsch, B. (Blackwell Science Ltd and the Eurographics Association, 1993)
      By Cooperative Editing we mean the coordinated manipulation of information by a group of authors. During the editing process the (co-)authors need to communicate their ideas, drafts and constraints (remotely or face-to-face) ...

    • Fast Spheres 

      Patterson, John W. (Blackwell Science Ltd and the Eurographics Association, 1993)
      A new method for generating sphere-like images, using parabolic surfaces delimited by Bresenham s circle- generation algorithm, is presented. In many cases the resultant images are indistinguishable from spheres illuminated ...

    • A Prototype of a Cooperative Visualization Workplace for the Aerodynamicist 

      Pagendarm, H.-G.; Walter, B. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Several feasibility studies for cooperative visualization were performed based on an existing modular visualization system. Two different architectures for the implementation of a cooperative system were identified, ...

    • Quality Control of an Interpolation Method for Discontinuous Parametric Surfaces 

      Seron, F.J.; Torrens, J.J; Magallon, J.A. (Blackwell Science Ltd and the Eurographics Association, 1993)
      In this paper we study a finite element interpolation method for fitting discontinuous parametric surfaces when the data points are the nodes of a curvilinear grid. Quality control of the interpolating surfaces is also ...

    • Scale-Invariant Minimum-Cost Curves: Fair and Robust Design Implements 

      Moreton, Henry P.; Sequin, Carlo H. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Four functionals for the computation of minimum cost curves are compared. Minimization of these functionals result in the widely studied Minimum Energy Curve (MEC), the recently introduced Minimum Variation Curve (MVC), ...

    • Cooperative Visualization of Computational Fluid Dynamics 

      Gerald-Yamasaki, Michael J. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Tempus Fugit/Interview is a computational fluid dynamics visualization application for which processing is distributed between high performance graphics workstations and supercomputers. Facilities are provided in the ...

    • Variational Surface Design and Surface Interrogation 

      Hagen, H.; Hahmann, St.; Bonneau, G.-P. (Blackwell Science Ltd and the Eurographics Association, 1993)
      The generation of technical smooth surfaces from a mesh of three-dimensional data points is an important problem in geometric modelling. In this publication we give a survey of some new techniques based on a calculus of ...

    • Verve 

      Knittel, Gunter (Blackwell Science Ltd and the Eurographics Association, 1993)
      The design principles of a hardware acceleratorfor volume rendering are described. The architecture represents a voxel subsystem which interfaces easily to any existing workstation. Host requirements are low since it ...

    • Interactive Neural Network Texture Analysis and Visualization for Surface Reconstruction in Medical Imaging 

      Busch, C.; Gro?, M.H. (Blackwell Science Ltd and the Eurographics Association, 1993)
      The following paper describes a new approach for the automatic segmentation and tissue classification of anatomical objects such as brain tumors from magnetic resonance imaging (MRI) data sets using artificial neural ...