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检索条件"任意字段=SIBGRAPI 2006: 19th Brazilian Symposium on Computer Graphics and Image Processing"

共 90 条记录，以下是51-60 订阅

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Parabolic Polygons and Discrete Affine Geometry

Parabolic Polygons and Discrete Affine Geometry

引用

brazilian symposium on computer graphics and image processing (sibgrapi)

作者： Marcos Craizer thomas Lewiner Jean-marie Morvan Department of Mathematics PUC-Rio Brazil Université Claude Bernard Lyon France

Geometry processing applications estimate the local geometry of objects using information localized at points. they usually consider information about the normal as a side product of the points coordinates. this work proposes parabolic polygons as a model for discrete curves, which intrinsically combines points and normals. this model is naturally affine invariant, which makes it particularly adapted to computer vision applications. this work introduces estimators for affine length and curvature on this discrete model and presents, as a proof-of-concept, an affine invariant curve reconstruction

关键词： Application software image reconstruction Information geometry computer vision Mathematics computer applications Numerical stability Surface reconstruction Robustness Solid modeling

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Robust adaptive meshes for implicit surfaces

Robust adaptive meshes for implicit surfaces

引用

brazilian symposium on computer graphics and image processing (sibgrapi)

作者： Afonso Paiva Helio Lopes thomas Lewiner Luiz Henrique De Figueiredo Department of Mathematics PUC-Rio Brazil IMPA Rio de Janeiro Brazil

this work introduces a robust algorithm for computing good polygonal approximations of implicit surfaces, where robustness entails recovering the exact topology of the implicit surface. Furthermore, the approximate triangle mesh adapts to the geometry and to the topology of the real implicit surface. this method generates an octree subdivided according to the interval evaluation of the implicit function in order to guarantee the robustness, and to the interval automatic differentiation in order to adapt the octree to the geometry of the implicit surface. the triangle mesh is then generated from that octree through an enhanced dual marching

关键词： Robustness Topology Geometry Solid modeling Arithmetic Surface cracks Mathematics Isosurfaces Mesh generation Rendering (computer graphics)

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Motion Segmentation using Mathematical Morphology

Motion Segmentation using Mathematical Morphology

引用

brazilian symposium on computer graphics and image processing (sibgrapi)

作者： Arnaldo Camara Lara Roberto Jr. Hirata Instituto de Matemática e Estatística University of São Paulo Sao Paulo Brazil

Motion segmentation is one of the first steps in image sequence applications. the problem has been extensively studied and approached in several ways but it remains a difficult task even for sequences acquired by stationary cameras. In this paper we propose a novel algorithm that is based on mathematical morphology. the algorithm is simple to be implemented, less subject to lighting changes and more robust to false positives. It has been tested in security cameras' image sequences showing promising results. Some algorithms from literature have been implemented and compared to the one described here

关键词： Motion segmentation computer vision Morphology image sequences Cameras Robustness Testing Layout Statistics Computational efficiency

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Reconstruction of 3D object meshes from silhouette images

Reconstruction of 3D object meshes from silhouette images

引用

19th brazilian symposium on computer graphics and image processing (sibgrapi 2006)

作者： Montenegro, Anselmo Antunes Velho, Luiz Carvalho, Paulo C. P. Sossai, Jonas, Jr. Univ Fed Fluminense Dept Ciencia Comp BR-24210240 Niteroi RJ Brazil Inst Nacl Matemat Pura & Aplicada Rio De Janeiro Brazil

In this work we propose a method for computing mesh representations of 3D objects reconstructed from a set of silhouette images. Our method is based on the polygonization of volumetric reconstructions by using a modified version of the dual contouring method. In order to apply dual contouring on volumetric reconstruction from silhouettes we devised a method that is able to determine the discrete topology of the surface in relation to the octree cells. We also developed a new scheme for computing hermitian data representing the intersections of conic volumes with the octree cells and their corresponding normals with subpixel accuracy. Due to the discrete and extremely noisy nature of the data used in the reconstruction we had to devise a different criterion for mesh simplification that applies topological consistency tests only when the geometric error measure is beyond a given tolerance. We present results of the application of the proposed method in the extraction of a mesh corresponding to the surface of objects of a real scene.

关键词： polygonization of volumetric reconstructions mesh reconstruction from silhouettes dual contouring octree polygonization Visual hulls image-based modeling mesh simplification

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GPU-Based Cell Projection for Interactive Volume Rendering

GPU-Based Cell Projection for Interactive Volume Rendering

引用

brazilian symposium on computer graphics and image processing (sibgrapi)

作者： Ricardo Marroquim Andre Maximo Ricardo Farias Claudio Esperanca Universidade Federal do Rio de Janeiro Brazil

We present a practical approach for implementing the projected tetrahedra (PT) algorithm for interactive volume rendering of unstructured data using programmable graphics cards. Unlike similar works reported earlier, our method employs two fragment shaders, one for computing the tetrahedra projections and another for rendering the elements. We achieve interactive rates by storing the model in texture memory and avoiding redundant projections of implementations using vertex shaders. Our algorithm is capable of rendering over 2.0 M Tet/s on current graphics hardware, making it competitive with recent ray-casting approaches, while occupying a substantially smaller memory footprint

关键词： Transfer functions Hardware Rendering (computer graphics) Projection algorithms computer graphics Nonlinear optics Optical attenuators Linear approximation Software algorithms Biomedical imaging

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Expression Transfer between Photographs through Multilinear AAM's

Expression Transfer between Photographs through Multilinear ...

引用

brazilian symposium on computer graphics and image processing (sibgrapi)

作者： Ives Macedo Emilio Vital Brazil Luiz Velho IMPA-Instituto Nacional de Matemática Pura e Aplicada Brazil

Expression transfer is a method for mapping a photographed expression performed by a given subject onto the photograph of another person's face. Building on well succeeded previous works by the vision researchers (facial expression decomposition, active appearance models and multilinear analysis, we propose a novel approach for expression transfer based on color images. We attack this problem with methods developed by the computer vision community for facial expression analysis and recognition. Combining active appearance models and multilinear analysis, it's possible to suitably represent and analyze expressive facial images, while separating both style (subject's identity) and content (expressive flavor) from the captured performance

关键词： Active appearance model Tensile stress Facial animation image databases image analysis image color analysis Performance analysis Visual databases Face detection computer vision

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Exploratory visualization based on multidimensional transfer functions and star coordinates

Exploratory visualization based on multidimensional transfer...

引用

brazilian symposium on computer graphics and image processing (sibgrapi)

作者： Alex Laier Bordignon Rener Castro Helio Lopes thomas Lewiner Geovan Tavares Departamento de Matemática-Matmídia Project PUC-Rio Rio de Janeiro Brazil

Exploration and analysis of multivariate data play an important role in different domains. this work proposes a simple interface prototype that allows a human user to visually explore multivariate spatial objects, such as images, sequence of images or volume. It uses star coordinates as a widget to display the multivariate data on the computer 2D screen. the user then identifies a feature on this powerful coordinate system by mapping a selected feature region on that widget to a color and opacity. As a visual result, the feature is rendered on the object's space composing the use of this maps and the star coordinates projection. Some examples illustrate the potential of this interface

关键词： Multidimensional systems Transfer functions Data visualization computer displays Data analysis Prototypes Rendering (computer graphics) Humans Two dimensional displays Geology

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Vector field reconstruction from sparse samples with applications

Vector field reconstruction from sparse samples with applica...

引用

brazilian symposium on computer graphics and image processing (sibgrapi)

作者： Marcos Lage Fabiano Petronetto Afonso Paiva Helio Lopes thomas Lewiner Geovan Tavares PUC-Rio-Departamento de Matemática Laboratório Matmídia Rio de Janeiro Brazil

We present a novel algorithm for 2D vector field reconstruction from sparse set of points-vectors pairs. Our approach subdivides the domain adaptively in order to make local piecewise polynomial approximations for the field. It uses partition of unity to blend those local approximations together, generating a global approximation for the field. the flexibility of this scheme allows handling data from very different sources. In particular, this work presents important applications of the proposed method to velocity and acceleration fields' analysis, in particular for fluid dynamics visualization

关键词： Least squares approximation Function approximation image reconstruction Computational modeling Hydrodynamics Acceleration computer graphics computer simulation Partitioning algorithms Deformable models

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Increasing statistical power in medical image analysis

Increasing statistical power in medical image analysis

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： Alexei M. C. Machado Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil

In this paper, we present a novel method for estimating the effective number of independent variables in imaging applications that require multiple hypothesis testing. the method increases the statistical power of the results by refuting the assumption of independence among variables, while keeping the probability of false positives low. It is based on the spectral graph theory, in which the variables are seen as the vertices of a complete undirected graph and the correlation matrix as the adjacency matrix that weights its edges. By computing the eigenvalues of the correlation matrix, it is possible to obtain valuable information about the dependence levels among the variables of the problem. the method is compared to other available models and its effectiveness illustrated in a case study on the morphology of the human corpus callosum

关键词： Biomedical imaging image analysis Testing image edge detection Probability Graph theory Error correction Medical tests Eigenvalues and eigenfunctions Morphology

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Improved FingerCode Matching Function

Improved FingerCode Matching Function

引用

brazilian symposium on computer graphics and image processing (sibgrapi)

作者： Gustavo de Sa Roberto Lotufo Sch. of Electr. & Comput. Eng. Campinas Univ. School of Electrical and Computer Engineering University of Campinas (UNICAMP) Campinas SP Brazil

FingerCode is a fingerprint correlation matching scheme that relies on texture information. In this scheme, the oriented components are extracted from a fingerprint image using a bank of Gabor filters, and a directional texture feature vector is computed for each oriented component. the feature vectors from the input and template images are compared and a matching score is obtained. Here, we explore ways to improve the matching score for the FingerCode method by using more complex matching functions. the best results were obtained by applying a nonlinear function to the texture values and weighting the texture vectors based on the spatial distribution

关键词： Fingerprint recognition Gabor filters image matching Fingers Pixel Data mining Filter bank Frequency Iris recognition Euclidean distance

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