Now showing items 1-20 of 22

    • Intrinsic Images by Clustering 

      Garces, Elena; Munoz, Adolfo; Lopez-Moreno, Jorge; Gutierrez, Diego (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Decomposing an input image into its intrinsic shading and reflectance components is a long-standing ill-posed problem. We present a novel algorithm that requires no user strokes and works on a single image. Based on simple ...
    • Pre-convolved Radiance Caching 

      Scherzer, Daniel; Nguyen, Chuong; Ritschel, Tobias; Seidel, Hans-Peter (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      The incident indirect light over a range of image pixels is often coherent. Two common approaches to exploit this inter-pixel coherence to improve rendering performance are Irradiance Caching and Radiance Caching. Both ...
    • Quantized Point-Based Global Illumination 

      Buchholz, Bert; Boubekeur, Tamy (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Point-based global illumination (PBGI) uses a dense point sampling of the scene's surfaces to approximate indirect light transport and is intensively used in 3D motion pictures and special effects. Each point caches the ...
    • Progressive Virtual Beam Lights 

      Novák, Jan; Nowrouzezahrai, Derek; Dachsbacher, Carsten; Jarosz, Wojciech (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      A recent technique that forms virtual ray lights (VRLs) from path segments in media, reduces the artifacts common to VPL approaches in participating media, however, distracting singularities still remain. We present Virtual ...
    • Matting and Compositing for Fresnel Reflection on Wavy Surfaces 

      Endo, Yuki; Kanamori, Yoshihiro; Fukui, Yukio; Mitani, Jun (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      This paper introduces a framework that can extract an alpha matte from a single image with Fresnel reflection, and that can composite other objects with the image such that plausible reflections are included. Our method ...
    • Per-Vertex Defocus Blur for Stochastic Rasterization 

      Munkberg, Jacob; Toth, Robert; Akenine-Möller, Tomas (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We present user-controllable and plausible defocus blur for a stochastic rasterizer. We modify circle of confusion coefficients per vertex to express more general defocus blur, and show how the method can be applied to ...
    • Example-Based Fractured Appearance 

      Glondu, Loeiz; Muguercia, Lien; Marchal, Maud; Bosch, Carles; Rushmeier, Holly; Dumont, Georges; Drettakis, George (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      A common weathering effect is the appearance of cracks due to material fractures. Previous exemplar-based aging and weathering methods have either reused images or sought to replicate observed patterns exactly. We introduce ...
    • Gamut Mapping Spatially Varying Reflectance with an Improved BRDF Similarity Metric 

      Pereira, Thiago; Rusinkiewicz, Szymon (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Recent spatially varying reflectance (svBRDF) printing systems can reproduce an input document as a combination of matte, glossy and metallic inks. Due to the limited number of inks, this reproduction process incurs some ...
    • Polynomial Optics: A Construction Kit for Efficient Ray-Tracing of Lens Systems 

      Hullin, Matthias B.; Hanika, Johannes; Heidrich, Wolfgang (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Simulation of light transport through lens systems plays an important role in graphics. While basic imaging properties can be conveniently derived from linear models (like ABCD matrices), these approximations fail to ...
    • ISHair: Importance Sampling for Hair Scattering 

      Ou, Jiawei; Xie, Feng; Krishnamachari, Parashar; Pellacini, Fabio (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We present an importance sampling method for the bidirectional scattering distribution function (bsdf) of hair. Our method is based on the multi-lobe hair scattering model presented by Sadeghi et al. [SPJT10]. We reduce ...
    • Analytic Tangent Irradiance Environment Maps for Anisotropic Surfaces 

      Mehta, Soham Uday; Ramamoorthi, Ravi; Meyer, Mark; Hery, Christophe (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Environment-mapped rendering of Lambertian isotropic surfaces is common, and a popular technique is to use a quadratic spherical harmonic expansion. This compact irradiance map representation is widely adopted in interactive ...
    • Fast Generation of Approximate Blue Noise Point Sets 

      Kalantari, Nima Khademi; Sen, Pradeep (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Poisson-disk sampling is a popular sampling method because of its blue noise power spectrum, but generation of these samples is computationally very expensive. In this paper, we propose an efficient method for fast generation ...
    • Accurate Fitting of Measured Reflectances Using a Shifted Gamma Micro-facet Distribution 

      Bagher, Mohammad Mahdi; Soler, Cyril; Holzschuch, Nicolas (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Material models are essential to the production of photo-realistic images. Measured BRDFs provide accurate representation with complex visual appearance, but have larger storage cost. Analytical BRDFs such as Cook- Torrance ...
    • Importance Sampling Techniques for Path Tracing in Participating Media 

      Kulla, Christopher; Fajardo, Marcos (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We introduce a set of robust importance sampling techniques which allow efficient calculation of direct and indirect lighting from arbitrary light sources in both homogeneous and heterogeneous media. We show how to distribute ...
    • Artistic Illumination Transfer for Portraits 

      Chen, Xiaowu; Jin, Xin; Zhao, Qinping; Wu, Hongyu (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      Relighting a portrait in a single image is still a challenging problem, particularly when only a single artistic reference photograph or painting is provided. In this paper, we propose an artistic illumination transfer ...
    • A Statistical Method for SVBRDF Approximation from Video Sequences in General Lighting Conditions 

      Palma, Gianpaolo; Callieri, Marco; Dellepiane, Matteo; Scopigno, Roberto (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We present a statistical method for the estimation of the Spatially Varying Bidirectional Reflectance Distribution Function (SVBRDF) of an object with complex geometry, starting from video sequences acquired with fixed but ...
    • Geometry Presorting for Implicit Object Space Partitioning 

      Eisemann, Martin; Bauszat, Pablo; Guthe, Stefan; Magnor, Marcus (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We present a new data structure for object space partitioning that can be represented completely implicitly. The bounds of each node in the tree structure are recreated at run-time from the scene objects contained therein. ...
    • Surface Relief Analysis for Illustrative Shading 

      Ammann, Lucas; Barla, Pascal; Guennebaud, Gaël; Granier, Xavier; Reuter, Patrick (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      In this paper, we present an analysis technique that leverages the complexity found in detailed 3D models for illustrative shading purposes. Given a smooth base surface with relief, it locates relief features (concavities, ...
    • Tessellation-Independent Smooth Shadow Boundaries 

      Mattausch, Oliver; Scherzer, Daniel; Wimmer, Michael; Igarashi, Takeo (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We propose an efficient and light-weight solution for rendering smooth shadow boundaries that do not reveal the tessellation of the shadow-casting geometry. Our algorithm reconstructs the smooth contours of the underlying ...
    • A Stylized Approach for Pencil Drawing from Photographs 

      Yang, Heekyung; Kwon, Yunmi; Min, Kyungha (The Eurographics Association and Blackwell Publishing Ltd., 2012)
      We present a stylized scheme that produces pencil drawings in a range of styles from an image. To produce controllable pencil drawing effects and remedy the problems of existing convolution-based schemes, we develop a swing ...