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computer graphics in Brazil: A selection of papers from sibgrapi 2006

computerS & graphics-UK 2008年第5期32卷 525-525页

作者： Oliveira, Manuel M. UFRGS Inst Informat Rio De Janeiro Brazil

sibgrapi is the main Brazilian conference in the areas of computer graphics, image processing and computer vision. Since its first edition in 1988, it has been held annually with the sponsorship of the Brazilian computer Society (SBC). sibgrapi 2006 was held on October 8-11 in Manaus, a dynamic city located at the heart of the Amazon Forest. In spite of its name, the Brazilian symposium on computer graphics and image processing has grown into a truly international conference. sibgrapi 2006 received 127 full-paper submissions from 12 different countries, which were reviewed by a large and diverse Program Committee composed by 104 members, from which 45 (43%) were from Latin America, 39 (38%) from the USA/Canada, 15 (14%) from Europe, and 5 (5%) from Asia/Australia.

关键词： computer graphics image processing computer vision Latin America paper images Sponsorship AT-Rich Interactive Domain-Containing Protein 1A

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Linear features detection in SAR images for urban analysis

Linear features detection in SAR images for urban analysis

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Brazilian symposium on computer graphics and image processing (sibgrapi)

作者： R.C.S. Costa F.N.S. Medeiros Campus do Pici DETI-UFC Fortaleza Ceara Brazil

This work is concerned with extracting straight lines in SAR image areas for application of urban analysis. The methodology combines the Hough transform and line detector algorithms proposed by Tupin et al. (1998) to ... 详细信息

关键词： computer vision image analysis Detectors Roads Testing image segmentation image edge detection image processing image reconstruction computer graphics

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Proceedings - sibgrapi 1998: international symposium on computer graphics, image processing, and vision

Proceedings - SIBGRAPI 1998: International Symposium on Comp...

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1998 international symposium on computer graphics, image processing, and vision. sibgrapi 1998

ISBN: (纸本)0818692154

The proceedings contain 62 papers. The topics discussed include: two frontiers in morphological image analysis: differential evolution models and hybrid morphological-linear neural networks;modeling and analysing computer animations;three-dimensional reconstruction from a set of video cameras of environments for virtual collaboration;image denoising, enhancement and segmentation: fast marching methods and geometric evolution;error measures in greedy insertion simplification methods;an algorithm for intersecting and trimming parametric meshes;stroking discrete polynomial Bezier curves via point containment paradigm;a constraint-based algorithm for engineering design;cache management for real time visualization of 2d data sets;towards perception driven visualization;load balancing for distributed virtual reality systems;image coding using irregular subsampling and Delaunay triangulation;image compression based on a multipoint Taylor series representation;directional interpolation pyramids for still image compression;a system's architecture for warping and morphing of graphical objects;real time video distribution using publication through a database;and rule-based classification procedures related to the unprecisely formulated expert rules.

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Proceedings sibgrapi'98. international symposium on computer graphics, image processing, and vision.(Cat. No.98EX237)

Proceedings SIBGRAPI'98. International Symposium on Computer...

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Brazilian symposium on computer graphics and image processing (sibgrapi)

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Modeling and analysing computer animations

Modeling and analysing computer animations

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international symposium on computer graphics, image processing, and vision.(sibgrapi 98)

作者： Magalhaes, LP UNICAMP Sch Elect & Comp Engn FEEC Dept Comp Engn & Ind Automat DCA BR-13083970 Campinas SP Brazil

ISBN: (纸本)0818692162

computer animation is a multifaceted field of computer graphics. This presentation explores one of these facets. At first computer animation will be surveyed through the use of a framework to help to order and classify its main approaches related to movement modeling. Then the use of Petri nets as a modeling and simulation tool to obtain some kind of foresight of a developed animation will be discuted.

关键词： animation modeling and analysis Petri nets behavioral animation

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Evaluation of three-dimensional reconstructions from arbitrary images

Evaluation of three-dimensional reconstructions from arbitra...

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international symposium on computer graphics, image processing, and vision.(sibgrapi 98)

作者： Mendonca, RMLO Campos, MFM Univ Fed Minas Gerais DCC Dept Ciencia Computacao Belo Horizonte MG Brazil

ISBN: (纸本)0818692162

This paper investigates computer vision.techniques for three-dimensional reconstruction having as source of information non-professional images captured from cameras of arbitrary position and orientation. The main purpose is to compose a methodology for 3D reconstruction, aiming specially at its use in the documentation of historic buildings and monuments through their three-dimensional modeling, For being particularly suitable, the technique of shape from stereo is then more closely analysed. Laboratory experiments, with controlled environment and objects are carried out in order to study the influence of some elements in the quality of reconstruction. A practical application with actual photographs of old buildings is presented, and final conclusions are drawn.

关键词： computer vision shape from stereo reconstruction architectural restoration

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image-based modeling using a two-step camera calibration method

Image-based modeling using a two-step camera calibration met...

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international symposium on computer graphics, image processing, and vision.(sibgrapi 98)

作者： Carvalho, PCP Szenberg, F Gattass, M Inst Matemat Pura & Aplicada BR-22460320 Rio De Janeiro Brazil

ISBN: (纸本)0818692162

We present a two-step camera calibration process based on linear least squares formulations. We show how to apply this process to build an integrated modeling environment, in which a scene is modeled by having the user specify, on a given image? a set of reference points (used for camera calibration) and object points (used for positioning the objects in the scene). Once this has been done, synthetic information can be superimposed onto the image and arbitrary views can be produced. Using this methodology, we developed Virtual Referee, an application to analyze soccer plays from still images, generating an OpenGL camera over a 3D field model.

关键词： image-based modeling camera calibration computer vision

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Visual processing throughout the visual field

Visual processing throughout the visual field

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international symposium on computer graphics, image processing, and vision.(sibgrapi 98)

作者： Faubert, J Univ Montreal Ecole Optometrie Montreal PQ H3C 3J7 Canada

ISBN: (纸本)0818692162

This paper summarizes work done in our laboratory with a special emphasis on functional aspects of the visual field. The quality of the perceived image within a visual display depends on the information available within the display itself but also on the capacity of the human visual system to process visual information. Specifically, I will discuss work on human visual processing which deals with our capacity to process flicker information and how this is affected by aging, colour motion, visual distortions as assessed by curvature, and symmetry.

关键词： perception visual field flicker colour motion curvature symmetry aging

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A unified geometric model for 3D confocal image analysis in cytology

A unified geometric model for 3D confocal image analysis in ...

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international symposium on computer graphics, image processing, and vision.(sibgrapi 98)

作者： Sarti, A Ortiz, C Lockett, S Malladi, R Univ Calif Berkeley Lawrence Berkeley Lab Berkeley CA 94720 USA

ISBN: (纸本)0818692162

In this paper, we use partial differential equation based analysis as a methodology for computer-aided cytology. We wish to accurately extract and classify the shapes of nuclei from noisy confocal microscopy images. This is a prerequisite to an accurate quantitative intranuclear (genotypic and phenotypic) and internuclear (tissue structure) analysis of cancerous and pre-cancerouse specimens. We study the use of a geometric-driven scheme for improving the results obtained by a nuclear segmentation method, based on automatic segmentation, followed by object reconstruction and interactive classification. We build a chain of methods that includes an edge-preserving image smoothing mechanism, an automatic (albeit non-regularized) segmentation method, a geometry-driven scheme to regularize the shapes and improve edge fidelity, and an interactive method to split shape clusters and reclassify them.

关键词： cytology image processing segmentation dynamic surfaces level sets differential geometry Riemannian geometry surface evolution

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InterFace: a real time facial animation system

InterFace: a real time facial animation system

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international symposium on computer graphics, image processing, and vision.(sibgrapi 98)

作者： Wey, JDR Zuffo, JA Univ Sao Paulo Escola Politecn Lab Sistemas Integraveis Sao Paulo Brazil

ISBN: (纸本)0818692162

This paper describes Interface, a real-time facial animation system. The system uses a simple set of pre-modeled facial expressions to create a wide range of emotions, mouth positions and complete head movements. The animation is done through layered groups of actions that combined gives the virtual actor complete freedom to perform different actions independently and simultaneously, without the intervention of the animator. Due to its software structure, Interface can be used as a "render plug-in" for an artificial intelligence program or a script-based animation system. The system was successfully implemented using the languages Java and VRML, and can be executed through the Internet in PCs or workstations with a Java-enable Web browser. Applications that can benefit from this system are interface agents, virtual reality systems and animation software, among others.

关键词： computer graphics real time facial animation facial expressions morphing virtual actors

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