Volume 15 (1996): Recent submissions

Now showing items 41-60 of 65

    • CCD-Camera Based Optical Beacon Tracking for Virtual and Augmented Reality 

      Madritsch, Franz; Gervautz, Michael (Blackwell Science Ltd and the Eurographics Association, 1996)
      We introduce a scheme for optical beacon tracking using two CCD-cameras and LED beacons. Due to the sub-pixel accuracy of the beacon detection algorithm a very high precision can be achieved so that the tracking method is ...

    • Interactive Occlusion and Automatic Object Placement for Augmented Reality 

      Breen, David E.; Whitaker, Ross T.; Rose, Eric; Tuceryan, Mihran (Blackwell Science Ltd and the Eurographics Association, 1996)
      We present several techniques for producing two visual and modeling effects in augmented reality. The first effect involves interactively calculating the occlusions between real and virtual objects. The second effect ...

    • Head-Tracked Stereo Viewing with Two-Handed 3 D Interaction for Animated Character Construction 

      Turner, Russell; Gobbetti, Enrico; Soboroff, Ian (Blackwell Science Ltd and the Eurographics Association, 1996)
      In this paper, we demonstrate how a new interactive 3 D desktop metaphor based on two-handed 3 D direct manipulation registered with head-tracked stereo viewing can be applied to the task of constructing animated characters. ...

    • Data Dependent Thin Plate Energy and its use in Interactive Surface Modeling 

      Greiner, Gunther; Loos, Joachim; Wesselink, Wieger (Blackwell Science Ltd and the Eurographics Association, 1996)
      When modeling spline surfaces of complex shape, one has to deal with an overwhelming number of control points. Modeling by direct manipulation of the control points is a tedious task. In particular, it is very difficult ...

    • Implicit Sweep Objects 

      Crespin, Benoit; Blanc, Carole; Schlick, Christophe (Blackwell Science Ltd and the Eurographics Association, 1996)

    • Generation of Smooth Surfaces by Controlling Curvature Variation 

      Higashi, Masatake; Tsutamori, Hideo; Hosaka, Mamoru (Blackwell Science Ltd and the Eurographics Association, 1996)
      To satisfy a designer s intention for constructing aesthetic shapes such as automotive bodies, we propose a surface generation method. In the surface design process, designers determine shapes according to their great ...

    • Physically-Based Deformations Constrained in Displacements and Volume 

      Promayon, E.; Baconnier, P.; Puech, C. (Blackwell Science Ltd and the Eurographics Association, 1996)
      This paper presents a method of constraining physically-based deformable objects. In this method, an object can be defined locally in terms of kinetic and dynamic (mass, position, speed), and physical parameters (compressibility, ...

    • Blob Metamorphosis based on Minkowski Sums 

      Galin, E.; Akkouche, S. (Blackwell Science Ltd and the Eurographics Association, 1996)
      This paper addresses the metamorphosis of soft objects built from skeletons. We propose a new approach that may be split into three steps. The first step consists in an original splitting of the initial and the final shapes ...

    • Matching and Interpolation of Shapes using Unions of Circles 

      Ranjan, V.; Fournier, A. (Blackwell Science Ltd and the Eurographics Association, 1996)
      While the notion of shape of an object is very intuitive, its precise definition is very elusive, and defining a useful metric for the shape distance between objects is a difficult endeavor. At the same time many successful ...

    • Special Effects with Half-Toning 

      Buchanan, John W. (Blackwell Science Ltd and the Eurographics Association, 1996)
      Half-toning is the process by which gray-scale images are approximated with sets of black and white pixels. The process works because our eyes perceive a local average, thus half-toning seeks to approximate the local ...

    • Method for Calculation of Sky Light Luminance Aiming at an Interactive Architectural Design 

      Dobashi, Yoshinori; Kaneda, Kazufumi; Yamashita, Hideo; Nishita, Tomoyuki (Blackwell Science Ltd and the Eurographics Association, 1996)
      Recently, computer graphics are frequently used for both architectural design and visual environmental assessment. Using computer graphics, designers can easily compare the effect of the natural light on their architectural ...

    • An Image based Measurement System for Anisotropic Reflection 

      Karner, Konrad F.; Mayer, Heinz; Gervautz, Michael (Blackwell Science Ltd and the Eurographics Association, 1996)
      This paper introduces an image based method for measuring bidirectional reflectance distribution functions (BRDF). The measurement system uses a CCD camera connected to a workstation to capture images from the material ...

    • Three-Dimensional Modeling and Effects on Still Images 

      Zakait, Yaron; Rappoport, Ari (Blackwell Science Ltd and the Eurographics Association, 1996)
      Designers and creative artists use computer graphics and image processing effects on stall photographs in application areas such as advertising entertainment broadcasting and the arts Most of the effects available in ...

    • Functions Defining Arbitrary Meshes - A Flexible Interface between Numerical Data and Visualization Routines 

      Rumpf, Martin; Schmidt, Alfred; Siebert, Kunibert G. (Blackwell Science Ltd and the Eurographics Association, 1996)
      Most of the rendering tools in scientific visualization are restricted to special data structures which differ substantially from the data formats used in numerical applications. Trying to close this gap, we present an ...

    • Incremental Line Labelling for Sketch Input of Solid Models 

      Grimstead, I. J.; Martin, R. R. (Blackwell Science Ltd and the Eurographics Association, 1996)
      Designers need to transfer three-dimensional objects from their minds via a two-dimensional interface into a solid modelling system. We propose a system where objects are sketched interactively in two-dimensions and ...

    • Energy Duality Methods for Piecewise Bezier Curve Construction 

      Bercovier, M.; Volpin, O. (Blackwell Science Ltd and the Eurographics Association, 1996)
      Piecewise Bezier Curves are constructed using a minimization principle. Ck and GCk continuity is imposed by linear constraints. The corresponding quadratic programming with linear constraints problem is introduced and ...

    • Pertinent Data for Modelling Pigmented Materials in Realistic Rendering 

      Callet, Patrick (Blackwell Science Ltd and the Eurographics Association, 1996)
      This article discusses the important problem of determining pertinent data to describe a pigmented medium. The first part deals with optical characteristics of pigments and the general properties of binders and fillers. ...

    • Efficient Lossless Image Contour Coding 

      Turner, Martin J.; Wiseman, Neil E. (Blackwell Science Ltd and the Eurographics Association, 1996)
      A process is presented for converting a raster image into a discrete set of plateaus or contours. A contour coder has been developed which fully describes these contours via their boundary descriptions in a compact and ...

    • The Layout Design Language: A Technique for Generating Layout Plans 

      Grimsdale, R.L.; Chang, C.W. (Blackwell Science Ltd and the Eurographics Association, 1996)
      The work described in this paper arose from a requirement for a system to support the production of models for training simulator visual systems and other visualisation applications. To reduce the labour involved in ...

    • An Efficient Algorithm for Line Clipping by Convex and Non-convex Polyhedra in E3 

      Skala, Vaclav (Blackwell Science Ltd and the Eurographics Association, 1996)
      A new algorithm for clipping lines against convex polyhedron with O(N) complexity is given with modification for non-convex polyhedron. The suggested algorithm is faster for higher number of facets of the given polyhedron ...