Browsing EG1991 Proceedings (Technical Papers) by Title

Now showing items 13-32 of 40

    • A DDA Octree Traversal Algorithm for Ray Tracing 

      Sung, Kelvin (Eurographics Association, 1991)
      A spatial traversal algorithm for ray tracing that combines the memory efficiency of an octree and the traversal speed of a uniform voxel space is described. A new octree representation is proposed and an implementation ...

    • Declarative Graphics And Dynamic Interaction 

      Johnson, C.W.; Harrison, M.D. (Eurographics Association, 1991)
      First order logic provides a means of integrating the specification and prototyping of interactive systems. It can describe graphical images in a declarative and order independent manner. It supports the definition of ...

    • Discrepancy as a Quality Measure for Sample Distributions 

      Shirley, Peter (Eurographics Association, 1991)
      Discrepancy, a scalar measure of sample point equidistribution, is discussed in the context of Computer Graphics sampling problems. Several sampling strategies and their discrepancy characteristics are examined. The ...

    • FACES: Facial Animation, Construction and Editing System 

      Patel, Manjula; Willis, Philip J. (Eurographics Association, 1991)
      The aim of the Facial Animation, Construction and Editing System (FACES) is to provide a software simulation of the human face. Attention has focused on the face as an important means of non-verbal communication. The ...

    • Fast Rendering of General Ellipses 

      Fellner, Dieter W.; Helmberg, Christoph (Eurographics Association, 1991)
      Even though GKS did not include circles and, in a more general form, ellipses and elliptical arcs in the list of elementary graphics primitives, CGM settled this omission with its standardization in 1987. According to CGM ...

    • Geometric Modelling from Range Image Data 

      Schmitt, Francis; Cken, Xin; Du, Wen-Hui (Eurographics Association, 1991)
      An adaptive surface fitting algorithm is proposed for modelling the digitized surface of a real object described by an array of 3D points sampled on a rectangular mesh and stored in the form of a range image. A G1 -piecewise ...

    • Integrating Inheritance and Composition in an Objective Presentation Model for Multiple Media 

      Took, Roger (Eurographics Association, 1991)
      A formal model is presented which combines, in a single structure called a tangle, the power to express both the composition of aggregate objects, and the selective inheritance of object properties over a number of instances ...

    • Interactive Conformance Testing for PHIGS 

      Cugini, John V. (Eurographics Association, 1991)
      Conformance testing for the Programmer’s Hierarchical Interactive Graphics System (PHIGS) standard presents certain novel difficulties, especially the indirect effect of many functions, and the inaccessibility to the program ...

    • Interrogation of Offsets of Polynomial Surface Patches 

      Vafiadou, Maria - Eleni; Patrikalakis, Nicholas M. (Eurographics Association, 1991)
      This paper presents an algorithm for computing the intersection of the offset (or parallel) surface of a polynomial surface patch ( rogenitor) of arbitrary degree, with a straight line. The rogenitor patch is expressed in ...

    • Liberation from Flatland: 3D Interaction Based on the Desktop Bat 

      Slater, Mel; Davison, Allan (Eurographics Association, 1991)
      A novel device for 3D interaction is introduced, the Desktop Bat. This device is an evolutionary development of a mouse. It is like a mouse in that it is used on a desktop, but provides 5 degrees of freedom since in ...

    • Low Sampling Densities using a psychovisual approach 

      Bouville, Christian; Tellier, Pierre; Bouatouch, Kadi (Eurographics Association, 1991)
      It has long been observed that the keenness of sight is lower for diagonal directions than for horizontal or vertical ones. This anisotropy of the human eye response can be exploited by using a non-orthogonal sampling ...

    • MOVE-X: A System for Combining Video Films and Computer Animation 

      Ertl, Gerhard; Müller-Seelich, Heimo; Tabatabai, Behnam (Eurographics Association, 1991)
      The objective of the presented project was to implement a system for the visualization of buildings. The system is used to create movies of buildings and interior rooms before they are built. For a realistic impression of ...

    • Radiosity for Furry Surfaces 

      Chen, Hong; Wu, En-Hua (Eurographics Association, 1991)
      Though radiosity method is an advanced rendering technique of global illumination, it is still not sufficiently to cope with many natural phenonmena such as furry surfaces. The rendering of furry surfaces has been a long ...

    • Refinement criteria for adaptive stochastic ray tracing of textures 

      van Walsum, Theo; van Nieuwenhuizen, Peter R.; Jansen, Frederik W. (Eurographics Association, 1991)
      Adaptive stochastic ray tracing is a rendering technique that generates high-quality anti-aliased images by sampling the image in a non-regular pattern that is adaptively refined. Image refinement can be guided by image ...

    • Sampling and Anti-Aliasing of Discrete 3-D Volume Density Textures 

      Sakas, Georgios; Gerth, Matthias (Eurographics Association, 1991)
      In recent years, a number of techniques have been developed for rendering volume effects (haze, fog, smoke, clouds, etc.) in order to enhance reality in computer-generated imagery as well as to improve the performance of ...

    • Serial cuttings matching: An application to muscle fiber characterization 

      Buche, Patrice (Eurographics Association, 1991)
      In this paper, we present one important aspect of a complete application of numerical image analysis in biology. We want to analyse a biological object through serial cuttings to measure morphological and biochemical ...

    • Several approaches to implement the merging step of the split and merge region segmentation 

      Popovic, M.; Chantemargue, F.; Canals, R.; Bonton, P. (Eurographics Association, 1991)
      The purpose of this paper is to propose several approaches for the implementation of the merging step of split and merge region segmentation. The splitting step has already been studied and its parallelization has subsequently ...

    • Shading with Area Light Sources 

      Tanaka, Toshimitsu; Takahashi, Tokiichiro (Eurographics Association, 1991)
      This paper derives a shading model for area light sources which covers both diffuse and specular reflection. The shading model assumes ideally diffuse polygonal light sources and uses Phong’s reflection model. The model ...

    • Solid-Interpolating Deformations: Construction and animation of PIPs 

      Kaul, Anil; Rossignac, Jarek (Eurographics Association, 1991)
      Computer programs that simulate the deformations of geometric shapes have played a key role in the increasing popularity of software tools for artistic animation. Previously published techniques for specifying and animating ...

    • A Symmetrical Input/Output Model 

      Carlsen, Niels Vejrup; Christensen, Niels Jorgen (Eurographics Association, 1991)
      When choosing a graphics system for the run-time support component of a User Interface Management System (UIMS) several problems arise. Existing inputloutput models employed by graphics systems lack support for fine grain ...