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2011 24th SIBGRAPI Conference on Graphics, Patterns and Images

28-31 Aug. 2011

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  • [Front cover]

    Publication Year: 2011, Page(s): C1
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  • [Title page i]

    Publication Year: 2011, Page(s): i
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  • [Title page iii]

    Publication Year: 2011, Page(s): iii
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  • [Copyright notice]

    Publication Year: 2011, Page(s): iv
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  • Table of contents

    Publication Year: 2011, Page(s):v - ix
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  • Message from General Chairs

    Publication Year: 2011, Page(s): x
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  • Message from Program Chairs

    Publication Year: 2011, Page(s): xi
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  • Organizing Committee

    Publication Year: 2011, Page(s): xii
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  • Program Committee

    Publication Year: 2011, Page(s):xiii - xvi
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  • Reviewers

    Publication Year: 2011, Page(s):xvii - xx
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  • Sponsors/Conference Support

    Publication Year: 2011, Page(s): xxi
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  • Best Paper awards

    Publication Year: 2011, Page(s):xxii - xxiii
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  • Texturing 3D Models with Low Geometric Features

    Publication Year: 2011, Page(s):1 - 8
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (706 KB) | HTML iconHTML

    This paper presents a texture projection and alignment method specifically tailored for objects with low geometric features. A common way to build virtual replicas is to acquire the geometry with a 3D scanner and model its reflectance properties (i.e. colors) by projecting photos onto the 3D surface. To correctly align each photo it is necessary to retrieve the camera's extrinsic matrix, which is ... View full abstract»

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  • Colorization and Illumination of 2D Animations Based on a Region-Tree Representation

    Publication Year: 2011, Page(s):9 - 16
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1409 KB) | HTML iconHTML

    Colorization and illumination are key processes for creating animated cartoons. Computer assisted methods have been incorporated in animation/illustration systems to reduce the artists' effort. This paper presents a new strategy for illumination and colorization of 2D drawings based on a region-tree. Starting from a hand-drawn cartoon, it extracts geometric and topological information and builds a... View full abstract»

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  • A New Method for Cutting Splats of Models with Sharp Features

    Publication Year: 2011, Page(s):17 - 24
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1254 KB) | HTML iconHTML

    Surface splatting is a fast rendering technique for point-based models that usually delivers good-quality renderings. However, the intrinsic characteristic of this technique is the treatment of points as if they were discs. That requires special processing near sharp edges and corners in order to prevent rendering artifacts from appearing. In this work, we present a clever way of clipping splats n... View full abstract»

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  • Memory-Efficient Computation of Persistent Homology for 3D Images Using Discrete Morse Theory

    Publication Year: 2011, Page(s):25 - 32
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (758 KB) | HTML iconHTML

    We propose a memory-efficient method that computes persistent homology for 3D gray-scale images. The basic idea is to compute the persistence of the induced Morse-Smale complex. Since in practice this complex is much smaller than the input data, significantly less memory is required for the subsequent computations. We propose a novel algorithm that efficiently extracts the Morse-Smale complex base... View full abstract»

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  • Semi-automatic Navigation on 3D Triangle Meshes Using BVP Based Path-Planning

    Publication Year: 2011, Page(s):33 - 40
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1141 KB) | HTML iconHTML

    Efficient path-planning methods are being explored along the years to allow the movement of robots or virtual agents in planar environments. However, there is a lot of space to improve the quality of paths restricted to 3D surfaces, with holes and bends for instance. This work presents a new technique for path-planning on 3D surfaces called 3DS-BVP. This path planner is based on Boundary Value Pro... View full abstract»

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  • Crowd Simulation: Improving Pedestrians' Dynamics by the Application of Lattice-Gas Concepts to the Social Force Model

    Publication Year: 2011, Page(s):41 - 47
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB) | HTML iconHTML

    The social force (SF) model has been successfully applied to the simulation of flows of pedestrians. Nevertheless, in some scenarios with low density, experiments show that the simulated individuals do not behave as expected, working as irrational particles rather than smart people. For example, by the means of the cited model, it is common to see many simulated individuals going several times str... View full abstract»

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  • Automatic Detection of 2D Human Postures Based on Single Images

    Publication Year: 2011, Page(s):48 - 55
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2849 KB) | HTML iconHTML

    Estimating human pose in static images is a challenging task due to the high dimensional state space, presence of image clutter and ambiguities of image observations. In this paper we propose a method to automatically detect human poses in a single image, based on a 2D model combined with anthropometric data. Furthermore, we use artificial neural networks to detect high level information about the... View full abstract»

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  • Geodesic Conic Subdivision Curves on Surfaces

    Publication Year: 2011, Page(s):56 - 63
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (627 KB) | HTML iconHTML

    In this paper we present a nonlinear curve subdivision scheme, suitable for designing curves on surfaces. Starting with a geodesic control polygon with vertices on a surface, the scheme generates a sequence of geodesic polygons that converges to a continuous curve on the surface. In the planar case, the limit curve is a conic Bezier spline curve. Each section of the subdivision curve, correspondin... View full abstract»

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  • Real-Time Terrain Modeling Using CPU-GPU Coupled Computation

    Publication Year: 2011, Page(s):64 - 71
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB) | HTML iconHTML

    Motivated by the importance of having real-time feedback in sketch-based modeling tools, we propose a framework for terrain edition capable of generating and displaying complex and high-resolution terrains. Our system is efficient and fast enough to allow the user to see the terrain morphing at the same time the drawing edition occurs. We have two types of editing interactions: the user can draw s... View full abstract»

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  • Beam Casting Implicit Surfaces on the GPU with Interval Arithmetic

    Publication Year: 2011, Page(s):72 - 77
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (658 KB) | HTML iconHTML

    We present a GPU-based beam-casting method for rendering implicit surfaces in real time with antialiasing. We use interval arithmetic to model the beams and to detect their intersections with the surface. We show how beams can be used to quickly discard large empty regions in the image, thus leading to a fast adaptive subdivision method. View full abstract»

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  • Sketch-Based Adaptive Mesh Augmentation Using Stellar Operators

    Publication Year: 2011, Page(s):78 - 85
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4985 KB) | HTML iconHTML

    In this paper we present a new method for modeling and editing surface detail using free-form curves and a natural interface. It combines in a original way an adaptive multiresolution mesh structure with a simple, intuitive sketch-based interface. One of the novel contributions of this work is the curve sensitive mesh resolution control, which allows the definition of a rich set of operators that ... View full abstract»

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  • Visual Patterns in the Plant Kingdom

    Publication Year: 2011, Page(s):86 - 92
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2483 KB) | HTML iconHTML

    There has been a lot of progress in modeling and rendering elements of our Natural World for computer graphics tasks. In the Plant Kingdom, techniques for modeling the visual patterns presented in many natural objects (such as stripes on a watermelon) have advanced far less than methods for modeling the shape and reflectance properties of individual or large collections of elements (such as leaves... View full abstract»

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  • Accurate Volume Rendering of Unstructured Hexahedral Meshes

    Publication Year: 2011, Page(s):93 - 100
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (763 KB) | HTML iconHTML

    Important engineering applications use unstructured hexahedral meshes for numerical simulations. Hexahedral cells, when compared to tetrahedral ones, tend to be more numerically stable and to require less mesh refinement. However, volume visualization of unstructured hexahedral meshes is challenging due to the trilinear variation of scalar fields inside the cells. The conventional solution consist... View full abstract»

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