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检索条件"任意字段=16th Brazilian Symposium on Computer Graphics and Image Processing, SIBGRAPI 2003"

共 108 条记录，以下是21-30 订阅

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Object segmentation in image sequences by watershed from markers: A generic approach 16

Object segmentation in image sequences by watershed from mar...

引用

16th brazilian symposium on computer graphics and image processing

作者： Flores, FU Lotufo, RD Departamento de Informática UEM Brazil Faculdade de Engenharia Elétrica e de Computação UNICAMP Brazil

ISBN: (纸本)0769520324

In this paper we propose a generic method to interactive object segmentation in image sequences. this method consists in the extension of efficient techniques of static image segmentation to image sequences by combining them to fast motion estimation techniques. the proposed method has the following characteristics: interactivity, generality, rapid response and progressive manual edition.

关键词： Biomedical imaging image segmentation image sequences Motion estimation MPEG 4 Standard Object detection Object segmentation Tracking Video coding Video surveillance

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Area fractions by linear analysis of intensity level histograms 16

Area fractions by linear analysis of intensity level histogr...

引用

16th brazilian symposium on computer graphics and image processing

作者： da Costa, JATB Univ Fed Santa Maria Dept Fis CCNE BR-97105900 Santa Maria RS Brazil

ISBN: (纸本)0769520324

Linear analysis of intensity level histograms is proposed as a method to determine the area fractions of homogeneous components of images. the area tractions are the coefficients of the respective histograms in the linear combination that best fits the histogram of the entire image. this method can be applied whenever the components can be identified by their individual histograms which must be linearly independent. Its accuracy was tested for images of real surfaces that were edited to contain known fractions of the component, and it proved to be suitable for the analysis of images made of textured components that show large overlapping of their histograms.

关键词： Histograms image analysis image processing image segmentation image texture analysis Independent component analysis Pixel Surface texture Testing Vegetation mapping

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Fast stellar mesh simplification 16

Fast stellar mesh simplification

引用

16th brazilian symposium on computer graphics and image processing

作者： Vieira, AW Velho, L Lopes, H Tavares, G Lewiner, T PUC Rio Lab Matmidia Rio De Janeiro Brazil

ISBN: (纸本)0769520324

this paper introduces Stellar Simplification, a fast implementation of the Four-Face Cluster algorithm. In our version of this mesh simplification scheme, we adopt a probabilistic heuristic that substitutes the priority queue of the original algorithm. this made our version, in average, 40% faster In our implementation, we adopt a very concise data structure which uses only two arrays of integers to represent the surface topology. We also introduce a new scheme,to encode and decode the hierarchy of meshes generated by the simplification algorithm. this scheme can be used for progressive transmission and compression of meshes.

关键词： Application software Clustering algorithms Computational modeling computer graphics Data structures Decoding Reconstruction algorithms Redundancy Surface reconstruction Topology

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Texture segmentation considering multiband, multiresolution and affine invariant roughness 16

Texture segmentation considering multiband, multiresolution ...

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16th brazilian symposium on computer graphics and image processing, sibgrapi 2003

作者： De Oliveira Nunes, É. Conci, A. Instituto de Computação UFF R Passo da Pátria 156 NiteróiRJ24210-240 Brazil

ISBN: (纸本)0769520324

Texture segmentation is a basic task in the process of satellite image analysis. However, texture characterization is not an easy task specially when more than one wavelength band need to be considered. Several difficulties are present, as the basic texture definition in different resolution and image scales. Consequently, some approaches are essentially empiric and should be adjusted to different needs. We present a new method for combining multiband information for texture segmentation. It is based on an extension of fractal dimension analyze of texture for multi channel and is rotational invariant this method allow texture classification of thematic maps made from combination of N wavelength bands. the method was validated comparing its results with others implementations using mosaic of natural textures and real satellite images. © 2003 IEEE.

关键词： image segmentation

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An interaction model for scientific visualization using sound 16

An interaction model for scientific visualization using soun...

引用

16th brazilian symposium on computer graphics and image processing

作者： Salvador, VCL Minghim, R Univ Sao Paulo Inst Ciencia Matemat & Comp Sao Carlos SP Brazil

ISBN: (纸本)0769520324

In scientific visualization, interaction tools allow users to navigate through volume and explore its features, helping information understanding. the use of sound as a data display tool (sonfication) has also been shown to support information understanding and may help dealing with adding dimensions to a visual display. However, thus far the issues of data exploration tools and sonfication have been treated separately by the visualization community. this paper presents an interaction model for scientific visualization that considers the main issues related to sonfication, and shows a prototype implemented to illustrate the proposed model. the prototype is a class library that implements a number of interaction tools with sonfication functions, which is freely available and can be employed in general purpose visualization applications.

关键词： computer graphics image processing Visualization

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Automatic shadow segmentation in aerial color images 16

Automatic shadow segmentation in aerial color images

引用

16th brazilian symposium on computer graphics and image processing

作者： Polidorio, AM Flores, FC Imai, NN Tommaselli, AMG Franco, C Univ Estadual Maringa BR-87020900 Maringa Parana Brazil

ISBN: (纸本)0769520324

A robust and efficient technique to segment shaded areas in aerial color images is presented in this paper. this technique is based on the physical phenomenon of atmospheric dispersion of the sunlight most well known as the Rayleigh scattering effect. this technique does not depend on special algorithms to classify or to form clusters of objects appearing in complex aerial images. In fact, the mathematical model, derived from the physical model is very simple but it produces consistent results and can be applied to color images obtained by airborne and orbital sensors (e.g., Landsat TM and IKONOS).

关键词： Atmospheric modeling Clustering algorithms Color Dispersion image segmentation image sensors Mathematical model Rayleigh scattering Robustness Satellites

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A novel photometric motion approach 16

A novel photometric motion approach

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16th brazilian symposium on computer graphics and image processing

作者： Torreao, JRA Fernandes, JL Leitao, HCG Pontificia Univ Catolica Parana Posgrad Informat Aplicada BR-80215901 Curitiba Parana Brazil

ISBN: (纸本)0769520324

Photometric motion is a computer vision process for the estimation of shape from image sequences of dynamic scenes. It was introduced by Pentland, based on his observation that the photometric effects of motion - the intensity change of a moving point - could dominate the purely geometric ones, due to projective distortion. Here we present a novel formulation for the same shape estimation problem, whose distinctive feature is that of being based on the irradiance change, due to the motion, at a given point in the image plane, and not, as in the original proposal, at a fixed location on the moving surface. thus we obtain an easily implementable procedure which yields good-quality estimates, and which can be extended to single-input shape reconstruction.

关键词： computer vision image reconstruction image sequences Layout Motion estimation Photometry Proposals Shape Surface reconstruction Yield estimation

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the language LinF for fractal specification 16

The language LinF for fractal specification

引用

16th brazilian symposium on computer graphics and image processing

作者： Pereira, FMQ Rolla, LT Rezende, CG Carceroni, RL Univ Fed Minas Gerais Dept Ciencia Computacoa BR-31270010 Belo Horizonte MG Brazil

ISBN: (纸本)0769520324

this article presents the language LinF for L-System specification. L-Systems are formal string rewriting systems introduced in 1968 by the botanist Aristid Lindenmayer that are used to model fractal images. LinF allows the definition of three-dimensional fractals and stochastic fractals. Together with the LinF definition this paper presents the implementation of cFLC, an OpenGL-based system that generates fractal images from LinF specifications. Results obtained through the LinF formalism show the ease of use and generality of the developed tools with respect to the existing literature.

关键词： Biological system modeling Clouds Equations Feedback Fractals Geometry image generation Polynomials Shape Stochastic processes

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A sketch-based collaborative design system 16

A sketch-based collaborative design system

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16th brazilian symposium on computer graphics and image processing

作者： Fan, Z Chi, M Oliveira, MM SUNY Stony Brook Dept Comp Sci Stony Brook NY 11794 USA

ISBN: (纸本)0769520324

We present a system for collaborative conceptual design that allows users potentially located in geographically distant areas to cooperate by sketching, exploring and modifying their ideas interactively, with immediate visual feedback. the system supports several modeling primitives and can be easily extended with user-defined objects. In this context, we introduce the notions of animated and sketchy billboards. Applications of this system include early stages of urban and landscape design, rapid prototype of virtual environments, animation, education and recreational use.

关键词： Animation Buildings Collaboration Collaborative work computer science Feedback Shape Space exploration Virtual environment Virtual prototyping

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Corresponding geometric distorted images using an uncertainty inference method 16

Corresponding geometric distorted images using an uncertaint...

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16th brazilian symposium on computer graphics and image processing

作者： da Silva, JDS Simoni, PO INPE BR-12227010 Sao Jose Dos Campos Brazil

ISBN: (纸本)0769520324

In this paper we present further results of the application of Dempster-Shafer theory for uncertainty reasoning in corresponding distorted images in computer Vision. In a previous work [12], the model was applied to correspond radiometrically distorted images, that is, images with differences in brightness and contrast, as an extension of the work developed in [I I]. the results showed the model is robust when dealing with pairs of non-equalized images and encouraged its to try to correspond geometric distorted images, that is, pairs of images in which one is rotated in relation to the other. In the conducted experiments, the right image was rotated by different angles to simulate the desired geometric distortions. the model was applied to a pair of rotated images and it successfully established the correspondence of a pair of points. As in previous works, the correspondence evidences are based on the contextual and structural features of the points and their combination is performed Dempster-Shafer's rule of combination for uncertainty reasoning. A search process maximizes the Belief on the combined evidences.

关键词： computer graphics image processing Uncertainty

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