Now showing items 21-40 of 52

    • Layered depth images 

      Shade, Jonathan; Gortler, Steven; He, Li-wei; Szeliski, Richard (Association for Computing Machinery, 1998)
      In this paper we present a set of efficient image based rendering methods capable of rendering multiple frames per second on a PC. The first method warps Sprites with Depth representing smooth surfaces without the gaps ...
    • A Lixel for every Pixel 

      Chong, Hamilton; Gortler, Steven (Eurographics Association, 2004)
      Shadow mapping is a very useful tool for generating shadows in many real-time rendering settings and is even used in some off-line renderers. One of the difficulties when using a shadow map is obtaining a sufficiently dense ...
    • A Local/Global Approach to Mesh Parameterization 

      Liu, Ligang; Zhang, Lei; Xu, Yin; Gotsman, Craig; Gortler, Steven (Eurographics Association and Blackwell Publishing Ltd., 2008)
      We present a novel approach to parameterize a mesh with disk topology to the plane in a shape-preserving manner. Our key contribution is a local/global algorithm, which combines a local mapping of each 3D triangle to the ...
    • The Lumigraph 

      Gortler, Steven; Grzeszczuk, Radek; Szeliski, Richard; Cohen, Michael F. (Association for Computing Machinery, 1996)
      This paper discusses a new method for capturing the complete appearance of both synthetic and real world objects and scenes, representing this information, and then using this representation to render images of the object ...
    • Meshing Genus-1 Point Clouds Using Discrete One-Forms 

      Tewari, Geetika; Gotsman, Craig; Gortler, Steven (Elsevier, 2006)
      We present an algorithm to mesh point clouds sampled from a closed manifold surface of genus 1. The method relies on a doubly periodic global parameterization of the point cloud to the plane, so no segmentation of the point ...
    • Minimal Surfaces for Stereo 

      Buehler, Chris; Gortler, Steven; Cohen, Michael F.; McMillan, Leonard (Springer, 2002)
      Determining shape from stereo has often been posed as a global minimization problem. Once formulated, the minimization problems are then solved with a variety of algorithmic approaches. These approaches include techniques ...
    • Multi-chart Geometry Images 

      Sander, Pedro V.; Wood, Zoe J.; Gortler, Steven; Snyder, John; Hoppe, Hugues (Eurographics Association/ Association for Computing Machinery, 2003)
      We introduce multi-chart geometry images, a new representation for arbitrary surfaces. It is created by resampling a surface onto a regular 2D grid. Whereas the original scheme of Gu et al. maps the entire surface onto a ...
    • NAIVE - Network Aware Internet Video Encoding 

      Briceño, Hector M.; Gortler, Steven; McMillan, Leonard (Association for Computing Machinery, 1999)
      The distribution of digital video content over computer networks has become commonplace. Unfortunately, most digital video encoding standards do not degrade gracefully in the face of packet losses, which often occur in a ...
    • A new reconstruction filter for undersampled light fields 

      Stewart, Jason; Yu, Jingyi; Gortler, Steven; McMillan, Leonard (Eurographics Association/ Association for Computing Machinery, 2003)
      This paper builds on previous research in the light field area of image-based rendering. We present a new reconstruction filter that significantly reduces the "ghosting" artifacts seen in undersampled light fields, while ...
    • On Asymptotically Optimal Meshes by Coordinate Transformation 

      Cañas, Guillermo D.; Gortler, Steven (Springer, 2006)
      We study the problem of constructing asymptotically optimal meshes with respect to the gradient error of a given input function. We provide simpler proofs of previously known results and show constructively that a closed-form ...
    • Orphan-Free Anisotropic Voronoi Diagrams 

      Canas, Guillermo D.; Gortler, Steven J. (Springer, 2011)
      We describe conditions under which an appropriately-defined anisotropic Voronoi diagram of a set of sites in Euclidean space is guaranteed to be composed of connected cells in any number of dimensions. These conditions are ...
    • A Perception-based Color Space for Illumination-invariant Image Processing 

      Chong, Hamilton; Gortler, Steven; Zickler, Todd (Association for Computing Machinery, 2008)
      Motivated by perceptual principles, we derive a new color space in which the associated metric approximates perceived distances and color displacements capture relationships that are robust to spectral changes in illumination. ...
    • Polyhedral Geometry and the Two-plane Parameterization 

      Gu, Xianfeng; Gortler, Steven; Cohen, Michael F. (Springer, 1997)
      Recently the light-field and lumigraph systems have been proposed as general methods of representing the visual information present in a scene. These methods represent this information as a 4D function of light over the ...
    • Quantum Versus Classical Learnability 

      Servedio, Rocco A.; Gortler, Steven (Institute of Electrical and Electronics Engineers (IEEE), 2001)
      Motivated by work on quantum black-box query complexity, we consider quantum versions of two well-studied models of learning Boolean functions: Angluin's (1988) model of exact learning from membership queries and Valiant's ...
    • Radiosity and Relaxation Methods 

      Gortler, Steven; Cohen, Michael F.; Slusallek, Philipp (Institute of Electrical and Electronics Engineers (IEEE), 1994)
      To date, there has been some confusion in the computer graphics community about how the progressive radiosity (PR) method relates to standard numerical methods for solving linear systems of equations. We show that PR is ...
    • Routing with Guaranteed Delivery on Virtual Coordinates 

      Ben-Chen, Mirela; Gotsman, Craig; Gortler, Steven (The Canadian Conference on Computational Geometry, 2006)
      We propose four simple algorithms for routing on planar graphs using virtual coordinates. These algorithms are superior to existing algorithms in that they are oblivious, work also for non-triangular graphs, and their ...
    • Scene Optimized Shadow Mapping 

      Chong, Hamilton Y.; Gortler, Steven J. (2007)
      Shadow mapping possesses an aliasing issue that is difficult to control. Recently a number of techniques, beginning with Perspective Shadow Maps have been proposed to choose the best possible 4 by 4 matrix for the light’s ...
    • Sensor Network Localization Using Sensor Perturbation 

      Zhu, Yuanchen; Gortler, Steven J.; Thurston, Dylan (Association for Computing Machinery, 2011)
      Sensor network localization is an instance of the NP-Hard graph realization problem. Thus, methods used in practice are not guaranteed to find the correct localization, even if it is uniquely determined by the input ...
    • Shape Operator Metric for Surface Normal Approximation 

      Cañas, Guillermo D.; Gortler, Steven J. (Springer Verlag, 2009)
      This work deals with the problem of practical mesh generation for surface normal approximation. Part of its contribution is in presenting previous work in a unified framework. A new algorithm for surface normal approximation ...
    • Signal-specialized parameterization for piecewise linear reconstruction 

      Tewari, Geetika; Snyder, John; Sander, Pedro V.; Gortler, Steven; Hoppe, Hugues (Eurographics Association/ Association for Computing Machinery, 2004)
      We propose a metric for surface parameterization specialized to its signal that can be used to create more efficient, high-quality texture maps. Derived from Taylor expansion of signal error, our metric predicts the signal ...