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检索条件"任意字段=13th Brazilian Symposium on Computer Graphics and Image Processing, SIBGRAPI 2000"

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Visualization of three-dimensional maps

Visualization of three-dimensional maps

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： L.A.P. Lozada C.X. de Mendonca J. Stolfi Inst. of Computing State University of Campinas-UNICAMP Sao Paulo Brazil Informatics Department University of Maringá Maringa Parana Brazil

A three-dimensional map is a partition of a 3D manifold into topological polyhedra. We consider the problem of visualizing the topology of a three-dimensional map given only its combinatorial description. Our solution starts by automatically constructing a "nice" geometric realization of the map in R/sup m/, for some m/spl ges/4. the geometric realization is chosen by optimizing certain aesthetic criteria, measured by energy functions. We then project this model to R/sup 3/, and display the resulting multi-celled solid object with a variety of specialized rendering techniques.

关键词： Visualization Solid modeling Topology Motion pictures computer graphics Energy measurement Displays Buildings Springs Books

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Interactive visualization over the WWW

Interactive visualization over the WWW

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： A.D. Alves M.C. Ferreira de Oliveira R. Minghim L.G. Nonato Dept. de Ciencias de Comput. e Estatistica ICMC/USP Sao Carlos Brazil Departamento de Ciências de Computação e Estatística ICMC USP Sao Paulo Brazil

the authors discuss several approaches for providing visualization solutions over the WWW, exploiting available technology for programming Web based applications. An implementation that supports interactive visualization of user data through a set of Java applets that interface with the Visualization Toolkit is presented, and its advantages and limitations are discussed. Such an implementation provides a general framework for providing high quality visualization resources on the WWW.

关键词： World Wide Web Data visualization Animation Collaborative work Pipelines HTML Java Internet Wide area networks Rendering (computer graphics)

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image decomposition in morphological residues: an approach for image filtering and segmentation

Image decomposition in morphological residues: an approach f...

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： S.J.F. Guimaraes N.J. Leite Dept. de Ciencia da Comput UFMG Minas Gerais Brazil Instituto de Computação State University of Campinas-UNICAMP Sao Paulo Brazil

Morphological residues represent an image in a hierarchical way by means of a decomposition of its structures and according to a size parameter /spl lambda/. From this decomposition, we can obtain a relation between the different residual levels associated with the complexity of the image structures. In this work, we introduce a method for filtering of components in gray-scale images based on the morphological residue decomposition which takes into account a size parameter and a certain level of complexity of the different structures we want to be filtered.

关键词： image decomposition Filtering image segmentation image analysis Information analysis Digital filters Gray-scale Morphology Digital images Shape

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image-based texture analysis for realistic image synthesis

Image-based texture analysis for realistic image synthesis

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： H. Mayer Computer Graphics and Vision Graz University of Technology Graz Austria

We present a method to measure reflectance and texture of surfaces in a one step process. For later use in digital image synthesis, it is mandatory to separate the gathered intensity values into these two parts to eliminate highlighting artifacts from textures. Our image based measurement system delivers bidirectional reflectance distribution function (BRDF) values distributed over the surface of the material under investigation. After fitting a reflectance model to the gathered data, we estimate the modulation of the diffuse reflectance coefficient which represents the texture. the last step analyzes the texture to get a parameterized and compact description of the measured surface properties. these results allow us to apply the gathered surface properties to objects with arbitrary shape and size. To keep the measurement system simple, a standard CCD camera and light source are used.

关键词： image analysis image texture analysis image generation Reflectivity Surface fitting Surface texture Digital images Bidirectional control Distribution functions Shape

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Towards real-time image segmentation using polynomial functions

Towards real-time image segmentation using polynomial functi...

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： A.D. Sappa L.M. Garcia Laboratoire ď Analyse et Architecture des Systemes Toulouse France

We present current developments towards a real-time method for segmentation of images for robotics applications. Our algorithm follows a fast scan line procedure (rows and columns), thus breaking the 2D segmentation problem in two 1D processes. In the first phase we use polynomial functions to find possible 1D boundaries in the image columns and rows separately. In a second step, a fusion method is applied, removing redundancies and false boundaries to find the regions of interest in the segmented images. We try to improve the algorithm using a coarse to fine multi-resolution approach. Preliminary results demonstrate possible applicability in real-time.

关键词： image segmentation Polynomials Least squares approximation image edge detection Pixel Redundancy Object detection Merging Humanoid robots Intelligent systems

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An estimation theoretic approach to 3D image interpolation

An estimation theoretic approach to 3D image interpolation

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： N.D.A. Mascarenhas I.A. Souza P.E. Cruvinel C.I. Biscegli R.R. Rosa Dept. de Computacao Univ. Fed. de Sao Carlos Brazil Depto. de Computação Universidade Federal de São Carlos Sao Carlos SP Brazil Laboratório Associado de Computação Instituto Nacional de Pesquisas Espaciais Sa Jose dos Campos SP Brazil

the paper presents a new approach to image 3D interpolation using Bayesian estimation theory. Two methods are presented, depending on the used a priori information. the approach is applied to the interpolation of X-ra... 详细信息

关键词： Estimation theory Interpolation Layout Tomography Bayesian methods Spline Pixel Instruments X-ray imaging Atmosphere

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Recognition of characters in plates of private brazilian vehicles using neural networks

Recognition of characters in plates of private Brazilian veh...

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： A. Da Rocha Gesualdi M.P. De Albuquerque J.M. Seixas L.P. Caloba Lab. de Processamento de Sinais COPPE Rio de Janeiro Brazil

this work considers the recognition of characters in plates of private brazilian vehicles using neural networks. Initially it defines a standard for the image as a prerequisite for the pre-processing. Afterwards, the reduction of the dimensionality is made in order to make use of the network. For this the paper establishes a figure of merit Q characterizing, amongst some algorithms of character splitting, the best one. Q is based on normalized cross correlation of the desired character image and the one obtained. the pre-processing allowed image improvement, reducing the background noise and increasing the contrast by applying a non-linear function. In the last stage, the neural network recognizes each character of the plate. Preliminary results are shown.

关键词： Character recognition Intelligent networks Vehicles Neural networks Communication system traffic control Neurons Background noise Modems Automotive engineering Traffic control

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Directional images applied to axonal arborization identification

Directional images applied to axonal arborization identifica...

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： S.M.F. Costa N. Peixoto J.M.V. De Oliveira L.M. Arantes F.J.R. Fernandez Lab. de Microelectron. Sao Paulo Univ. Brazil Grupo Sensores Integráveis e Microsistemas Laboratório de Microeletrônica da Escola Politécnica da USP Sao Paulo Brazil Universidade de Sao Paulo Sao Paulo SÃ£o Paulo BR

this work presents results on axonal arborization identification in a cell culture of neurons from Helix aspersa with the use of the directional image method. We implemented an algorithm that had initially been propos... 详细信息

关键词： Fingerprint recognition Neurons Signal to noise ratio Optical filters Pixel Algorithm design and analysis Optical noise Biomedical optical imaging Libraries image segmentation

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A framework for networked reactive characters

A framework for networked reactive characters

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： D. Szwarcman B. Feijo M. Costa Department of Informatics PUC-Rio ICAD-Intelligent CAD Laboratory Rio de Janeiro Brazil

the paper presents a framework for distributed reactive characters on a computer network and proposes innovative concepts for shared state management. Firstly, behavioral accuracy is defined in terms of three types of state (physical, procedural and emotional). Secondly, visual soundness, a concept inversely proportional to behavioral accuracy, is associated with the autonomy of clones. thirdly, the usual concept of dead reckoning is relaxed by exploring the idea of autonomy, which is the basis for networked reactive characters. the framework, built on top of an open architecture toolkit called Bamboo, can gracefully cope with reactive environments producing good levels of visual soundness, which results in smooth animations, and behavioral accuracy.

关键词： Virtual environment Dead reckoning Cloning computer network management Environmental management Intelligent networks Laboratories Informatics Electronic mail Innovation management

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Ray path categorization

Ray path categorization

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brazilian symposium on computer graphics and image processing (sibgrapi)

作者： D. Nehab M. Gattass Grupo de Tecnologia em Computacao Grafica Rio de Janeiro Brazil TeCGraf-Grupo de Tecnologia em Computação Gráfica Rio de Janeiro Rio de Janeiro Brazil

Edge detection and image segmentation algorithms usually operate on an image to extract geometrical information based on pixel colors. For ray-traced images, the presence of geometrical information on the scene from which the image was rendered allows for a completely different approach. We present an algorithm that divides rays into equivalence classes, or categories. the category information is generated during the rendering process and used to determine edges in the resulting image. Detected edges can later be used to help determine areas subject to aliasing. Little effort is needed to implement the described algorithms over an existing ray tracer. Furthermore, the extra computational and memory requirements are modest.

关键词： image edge detection Layout image segmentation Pixel Equations Rendering (computer graphics) Cameras Light sources Optical reflection Lighting

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