Browsing Volume 12 (1993) by Title

Now showing items 27-46 of 62

    • An Integral Geometry Based Method for Fast Form-Factor Computation 

      Sbert, Mateu (Blackwell Science Ltd and the Eurographics Association, 1993)
      Monte Carlo techniques have been widely used in rendering algorithms for local integration. For example, to compute the contribution of a patch to the luminance of another. In the present paper we propose an algorithm based ...

    • An Integrated System for Modeling, Animating and Rendering Hair 

      Daldegan, Agnes; Thalmann, Nadia Magnenat; Kurihara, Tsuneya; Thalmann, Daniel (Blackwell Science Ltd and the Eurographics Association, 1993)
      There are basically four problems to solve in order to produce realistic animated synthetic actors with hair: hair modeling and creation, hair motion, collision detection and hair rendering. This paper describes a complete ...

    • 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 ...

    • Introducing blending operations in feature models 

      Laakko, Timo; Mantyla, Martti (Blackwell Science Ltd and the Eurographics Association, 1993)
      We describe the implementation of a blending facility in the context of a feature modelling system where solid and feature-based modelling operations can be utilized in parallel during the design process of a part. The ...

    • Landscapes Synthesis Achieved through Erosion and Deposition Process Simulation 

      Roudier, P.; Peroche, B.; Perrin, M. (Blackwell Science Ltd and the Eurographics Association, 1993)
      This paper describes an original approach to terrain evolution in landscapes synthesis. In order to create some realistic landforms, we simulate geologically contrasted terrains and apply to them deterministic erosion ...

    • 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 ...

    • 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 ...

    • Modeling of Skylight and Rendering of Outdoor Scenes 

      Tadamura, Katsumi; Nakamae, Eihachiro; Kaneda, Kazufumi; Baba, Masashi; Yamashita, Hideo and Nishita, Tomoyuki (Blackwell Science Ltd and the Eurographics Association, 1993)
      Photorealistic animated images are extremely effective for pre-evaluating visual impact of city renewal and construction of tall buildings. In order to generate a photorealistic image not only the direct sunlight but also ...

    • 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 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 ...