Browsing EG1981 by Issue Date

Now showing items 1-20 of 30

    • COMPUTER AIDED DESIGN LANGUAGE 'CADLAN' 

      Bigelmaier, Anton; Brunner, Helmut; Strack, Helmut (The Eurographics Association, 1981)

    • AN APPROACH TO A CALCULATION-MINIMIZED HIDDEN LINE ALGORITHM 

      Hornung, Christoph (The Eurographics Association, 1981)
      Hidden line algorithms based on picture primitives only cannot recognize the areas of a picture completely visible or invisible. By testing each primitive of these areas they produce an overhead of calculations. Moreover ...

    • A HARDWARE APPROACH TO THE CORE SYSTEM OF ACM/SIGGRAPH 

      Möller, Gerd (The Eurographics Association, 1981)
      A new structure of the picture generation pipeline for a high-performance vector refresh graphic system is proposed. This pipeline consists of a graphic processor calculating the viewing transformations, a refresh buffer ...

    • A GKS INTERFACE TO A REALTIME ORIENTED RASTER WORKSTATION FOR CAD APPLICATIONS 

      Lindner, R.; Rix, J. (The Eurographics Association, 1981)
      The interface of the Graphical Kernel System GKS is examined with respect to the demands of realtime raster graphics. First the computation time for the different transformations is estimated, to show the great gap between ...

    • THE GEOMETRIC WORKBENCH (GWB) - AN EXPERIMENTAL GEOMETRIC MODELING SYSTEM 

      Mäntylä, Martti; Takala, Tapio (The Eurographics Association, 1981)
      The Geometric workbench (GWB), an experimental. geometric modeling system, is described. It is based on a hybrid representation scheme, where solids are represented by CSG volume trees and boundary representations. Boundary ...

    • STATE OF THE ART IN COMPUTER GRAPHICS: A SIGGRAPH PERSPECTIVE 

      Badler, Norman I.; Ellis, Robert A. (The Eurographics Association, 1981)

    • EXPERIENCES IN THE DESIGN AND SUPPORT OF A GRAPHICS DEVICE DRIVER INTERFACE 

      Reed, Theodore N. (The Eurographics Association, 1981)
      The Common Graphics System (CGS) was developed at the Los Alamos National Laboratory. A standard device driver interface was defined for graphics device drivers and for use by user-callable graphics subroutine packages. ...

    • Graphics Standards - Where are we ? 

      Hagen, Paul J.W. ten (The Eurographics Association, 1981)
      An overview is given of the state of the standardization efforts of ISO/TC97/SC5/WG2, which currently concentrate on GKS. The standardization activities are illustrated by presenting a recently incorporated concept of ...

    • A GKS IMPLEMENTATION FOR METEOROLOGICAL APPLICATIONS 

      Ducrot, A.; Lemaire, A.; Watkins, H. (The Eurographics Association, 1981)
      In this paper we describe a GKS implementation made at ECMWF and we point out some problems encountered related to the definition of GKS 6.2 and to the necessity to adapt to the meteorogical applications.

    • SMOOTHING A DIGITIZED CURVE BY DATA REDUCTION METHODS 

      Opheim, Harald (The Eurographics Association, 1981)
      In order to reduce storage and subsequent processing costs for a digitized cartographic curve, we may wish to reduce the data set. The data reduction method which is described in this paper, can be used on-line during the ...

    • ABSTRACT DATA TYPE BASED PROGRAMMING STYLE AND COMPUTER GRAPHICS 

      Giloi, W. K. (The Eurographics Association, 1981)
      The next generation of "intelligent" industrial robots will necessitate off-line programming systems in which generative graphics (picture generation) and cognitive graphics (picture understanding) is combined. This will ...

    • VOICE RECOGNITION IN A GRAPHIC SYSTEM 

      Gnettner, Wolfgang (The Eurographics Association, 1981)
      Voice recognition is discussed as a useful tool in interactive graphics. Two applications in electronical design and surveying are described. First results show an increased input speed, a low error probability and more ...

    • TIME AND SPACE BOUNDS FOR HIDDEN LINE AND HIDDEN SURFACE ALGORITHMS 

      Schmitt, Alfred (The Eurographics Association, 1981)
      Asymptotic worst case time bounds for three hidden line algorithms are derived and analysed. The first algorithm is a brute force solution that needs at least quadratic time. The second exact hidden line algorithm is based ...

    • SOME USEFUL BUT RATHER UNUSUAL GRAPHICAL PRIMITIVES 

      Magnenat-Thalmann, Nadia; Thalmann, Daniel; Bergeron, Philippe (The Eurographics Association, 1981)
      The MIRALIB library is a powerful graphical library which may be used with MIRA-2D, a graphical PASCAL extension as well as with the standard PASCAL language. MIRALIB includes figure algebra routines, figure measure ...

    • FAST INTERACTIVE GRAPHIC ANALYSIS AND PRESENTATION OF IRREGULARLY SPACED LATA z(x,y) 

      Hartwig, R. R. (The Eurographics Association, 1981)
      This is a method to be applied in R&D. 1. A surface is generated, containing exactly all given points z(x,y). 2. The degree of accuracy is gradually specified. One can swap 'ACCURACY for SPEED'. 3. 'Out of the picture' ...

    • A NEW METHOD FOR LOCAL SMOOTH INTERPOLATION 

      Renner, Gabor; Pochop, Vladimir (The Eurographics Association, 1981)
      A new method for interpolation is presented which starts from a given set of data pints. The resulting curve consisting of a set of polynomials has tangent vector continuity in the nodes, and can have straight line sections ...

    • TELIDON: WHERE VIDEOTEX MEETS COMPUTER GRAPHICS 

      Newman, Hannah (The Eurographics Association, 1981)
      Videotex is a system by which information can be accessed from central data bases by the general public. By the use of a television receiver augmented by a micro-computer controlled interface device, a user can access pages ...

    • EXTRACTING LINE MAPS FROM IMAGES 

      Jimenez, Javier; Navalon, Jose L. (The Eurographics Association, 1981)
      We present methods to vectorize automatically information given in raster form, the algorithms used are discussed briefly, and results for some test cases are presented. The compression of information is discussed as well ...

    • APPLICATION OF GINO-F TO USE DISPLAY FILE TECHNIQUES ON RASTER SCAN DISPLAYS 

      Bramer, B; Sutcliffe, D C (The Eurographics Association, 1981)
      Raster scan displays are now available at lower costs than vector refresh displays. While many offer more facilities such as fill area and colour or greyscale capabilities, few offer a display file facility. It is desirable ...

    • AUTOMATIC GENERATION OF A CUBIC B-SPLINE REPRESENTATION FOR A GENERAL DIGITIZED CURVE 

      Lozover, O.; Preiss, K. (The Eurographics Association, 1981)
      Cubic B-splines are often used to represent curves and are usually specified by a process of interaction on a graphic screen between the designer and the computer. This paper describes a program which, when given a digitized ...