Browsing Volume 12 (1993) by Title

Now showing items 36-55 of 62

    • A New Approach for the Generation of Circles 

      Hsu, S. Y.; Chow, Louis R.; Liu, H. C. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Two incremental algorithms for drawing circles using short line segments are proposed in this paper. The proposed algorithms can draw manypoints at one time. They use only addition, subtraction, and shift operations except ...

    • A New Paradigm for Geometric Processing 

      Yamaguchi, Fujio; Niizeki, Masatoshi (Blackwell Science Ltd and the Eurographics Association, 1993)
      A new paradigm for geometric processing is proposed. The paradigm can be featured by the four key phrases: (1) Totally Four Dimensional Homogeneous Processing, (2) 4 ? 4 Matrix Method and 4 ? 4 Determinant Method, (3) ...

    • A New Radiosity Approach Using Area Sampling for Parametric Patches 

      Nishita, Tomoyuki; Nakamae, Eihachiro (Blackwell Science Ltd and the Eurographics Association, 1993)
      A high precision illumination model is indispensable for lighting simulation and realistic image synthesis. For the purpose of improving realism, research on global illumination has been done, and several papers on radiosity ...

    • Nonsplitting Macro Patches for Implicit Cubic Spline Surfaces 

      Guo, B. (Blackwell Science Ltd and the Eurographics Association, 1993)
      Macro patches are important for generating quadric or cubic implicit spline surfaces from the input of a polyhedron. All existing macro patches split the triangular facets of the polyhedron- this paper presents cubic ...

    • A Note on 3D-Clip Optimisation 

      Hubl, Josef (Blackwell Science Ltd and the Eurographics Association, 1993)
      In order to optimize the transformation-clipping-pipeline of PHIGS or GKS-3D it is sometimes necessary to determine whether a plane intersects a perpendicular volume or not. The solution to this problem is not very ...

    • 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 ...

    • On the Application of Quantization and Dithering Techniques to History of Arts 

      Coltelli, P.; Faconti, G.; Marfori, F. (Blackwell Science Ltd and the Eurographics Association, 1993)
      The diffusion of computing techniques within humane studies is considerably increasing, due to technological advances and reduction in computing costs, with History of Arts being one of the most interesting fields of ...

    • Parallel 3D Delaunay Triangulation 

      Cignoni, P.; Montani, C.; Perego, R.; Scopigno, R. (Blackwell Science Ltd and the Eurographics Association, 1993)

    • Photo-Realistic Imaging of Digital Terrains 

      Cohen, Daniel; Shaked, Amit (Blackwell Science Ltd and the Eurographics Association, 1993)
      We present a method for the generation of photo-realistic images of views over terrain datasets by mapping a digital aerial photograph on a perspective projection of a digital elevation map. We use high resolution for both ...

    • Pictorial Editing by Shape Matching Techniques 

      Ventura, A. Della; Ongaro, P.; Schettini, R. (Blackwell Science Ltd and the Eurographics Association, 1993)
      A number ofpainting and retouching packages operate much like the artist s traditional canvas andpalette, with electronic toolsfunctioning like their studio counterparts. These programs, while offering an ample set of tools ...

    • The Potential Equation and Importance in Illumination Computations 

      Pattanaik, S. N.; Mudur, S. P. (Blackwell Science Ltd and the Eurographics Association, 1993)
      An equation adjoint to the luminance equation for describing the global illumination can be formulated using the notion of a surface potential to illuminate the region of interest. This adjoint equation which we shall call ...

    • PRIP - A Parallel Raster Image Processor 

      Van Campenhout, Jan M.; Lasure, Roeland (Blackwell Science Ltd and the Eurographics Association, 1993)
      Like colour video displays and laser printers, laser photoplotters are raster scan devices. For such devices, the pixel stream representing the image must be generated in real time, and in the (scan line) order required. ...

    • A Progressive Radiosity Algorithm for Scenes Containing Curved Surfaces 

      Bao, Hujun; Peng, Qunsheng (Blackwell Science Ltd and the Eurographics Association, 1993)
      Based on the theory of light energy transfer between two differential diffuse surface areas, a generalized radiosity approach is presented. Unlike the conventional radiosity method, curved surfaces are subdivided into ...

    • 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, ...

    • Pseudo-Satellitefilm Using Fractal Clouds to Enhance Animated Weather Forecasting 

      Sakas, Georgios; Schroder, Florian; Koppert, Hans-Joachim (Blackwell Science Ltd and the Eurographics Association, 1993)
      We have developed a system enabling the National German Meteorological Office to generate pseudo-satellite images and video sequences based on their weather forecasting simulation data. With our system meteorologists can ...

    • 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 ...

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

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

    • A Rendering Algorithm for Discrete Volume Density Objects 

      Blasi, Philippe; Le Saec, Bertrand; Schlick, Christophe (Blackwell Science Ltd and the Eurographics Association, 1993)
      We present a new algorithm for simulating the effect of light travelling through volume objects. Such objects (haze, fog, clouds.) are usually modelized by voxel grids which define their density distribution in a discrete ...

    • 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), ...

    • 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, ...