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检索条件"任意字段=14th Brazilian Symposium on Computer Graphics and Image Processing, SIBGRAPI 2001"

共 47 条记录，以下是31-40 订阅

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Dynamic algorithm binding for interactive walkthroughs 14

Dynamic algorithm binding for interactive walkthroughs

引用

14th brazilian symposium on computer graphics and image processing

作者： Pires, P Pereira, J INESC ID P-1000029 Lisbon Portugal

ISBN: (纸本)0769513301

this paper presents a novel approach to the real-time rendering of complex scenes problem. Up to the present date, a huge number of acceleration techniques have been proposed, although most are geared towards a specific kind of scene. Instead of using a single, or a fixed set of rendering acceleration techniques, we propose the use of several, and to select the best one based on the current viewpoint. thus, dynamically adapting the rendering process to the contents of the scene, it is possible to take advantage of all these techniques when they are better suited, rendering scenes that would otherwise be too complex to display at interactive frame rates. We describe a framework capable of achieving this purpose, consisting on a pre-processor and an interactive rendering engine. the framework is geared towards interactive applications were a complex and large scene has to be rendered at interactive frame rates. Finally, results taken from our test implementation are given.

关键词： Rendering (computer graphics)

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On determining a signature for skeletal maturity 14

On determining a signature for skeletal maturity

引用

14th brazilian symposium on computer graphics and image processing

作者： da Silva, AMM Olabarriaga, SD Dietrich, CA Schmitz, CAA Univ Fed Santa Maria CCNE Dept Fis BR-97105900 Santa Maria RS Brazil

ISBN: (纸本)0769513301

In this paper we present a computational framework for semi-automated assessment of skeletal age based on a multi-scale image analysis approach. through 2D digital X-ray images of the left hand, maturity indicators are searched by means of a two-step process: the user interactively indicates a point inside the middle finger, and the computational method analyzes the image intensity profile, along this line, searching for physiological signatures related to different epiphyseal events (ossification, cartilage stage, early fusion and complete fusion). A scale-space approach is used to select the best scale to enhance the edges between the bones and soft tissues. Initial results indicate that this approach could be useful to facilitate the analysis of growth disorders in pediatrics.

关键词： image analysis

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Segmentation into fuzzy regions using topographic distance 14

Segmentation into fuzzy regions using topographic distance

引用

14th brazilian symposium on computer graphics and image processing

作者： Philipp-Foliguet, S Vieira, MB Araújo, ADA UCP ENSEA Equipe Traitement Images & Signal F-95014 Cergy France

ISBN: (纸本)0769513301

this paper exposes an algorithm which leads to a fuzzy segmentation. this algorithm performs, as in the watershed method, a progressive flood of the gradient image from pixels of lowest gradients. It uses a new distance, called topographic distance. Any local minimum of the gradient norm image constitutes a seed for the region g-rowing, avoiding the use of a marker image. these seeds constitute the cores of the initial fuzzy regions. then the sites are gradually agglomerated to the region, while their membership degrees to the region decrease, according to the distance to the core and to the gradient norms, by the way of the topographic distance. the numerous fuzzy regions are then merged and the membership degrees of pixels to final regions are computed. Applications concern crisp segmentation of colour or gray scale images and pattern recognition from fuzzy regions.

关键词： segmentation fuzzy region watershed colour image topographic distance

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Procedural models on image synthesis for ocean animation

Procedural models on image synthesis for ocean animation

引用

14th brazilian symposium on computer graphics and image processing

作者： Pozzer, CT Pellegrino, SRM ITA Sao Jose Dos Campos SP Brazil

ISBN: (纸本)0769513301

this paper presents image-synthesis techniques to define, animate and visualize scenes simulating the behavior of the open-sea surface. Wave modeling is obtained by means of the bump mapping technique. Wave texture, defined by noise functions, is applied by means of a solid-space animation technique to generate surface animation. An implementation based on the Phong model is used to determine diffuse and specular reflections. As a result of the synthesis process, a set of frames is obtained, to be used to compose the animation.

关键词： Animation

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Parallel DSP architecture for reconstruction of tomographic images using wavelets techniques. 14

Parallel DSP architecture for reconstruction of tomographic ...

引用

14th brazilian symposium on computer graphics and image processing

作者： Pereira, MFL Koenigkan, LV Cruvinel, PE UFSCar Dept Comp BR-13565905 Sao Carlos SP Brazil

ISBN: (纸本)0769513301

this poster describes a technique for reconstructing tomographic images generated by a minitomograph scanner for soil science developed by Embrapa Agricultural Instrumentation using a parallel DSP architecture with an HEPC2E board from Hunt Engineering with two TMS320C40 processors from Texas Instruments. the software designed for visualization of bi-and tri-dimensional images uses Code Composer tool combined with Parallel C from 3L and Borland Builder C++. Reconstruction and interpolation tasks were distributed throughout the platform processors, using parallel algorithms in order to improve speed and processing power. the work resulted in an increase of about 15% in the system speed when compared with that reached using a classical platform at 200 MHz.

关键词： image reconstruction

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Transform image coding with global thresholding: Application to baseline JPEG

Transform image coding with global thresholding: Application...

引用

14th brazilian symposium on computer graphics and image processing

作者： Zaid, AO Olivier, C Alata, O Marmoiton, F IRCOM SIC UMR 6615 SP2MI F-86962 Futuroscope France

ISBN: (纸本)0769513301

Many image compression schemes perform the discrete cosine transform (DCT) to represent an image in frequency space. An analysis of a suite of images confirms that the luminance AC coefficients can be modeled by a Laplacian distribution. the distribution model can be used to drop the insignificant coefficients. In this paper we develop an image-adaptive JPEG encoding algorithm that incorporates global thresholding and near optimal quantization approach based on Lagrangian multiplier. Simulation results demonstrate that, with our thresholding technique, we can improve the reconstructed image quality compared to the one provided by other DCT image coding schemes without thresholding.

关键词： Discrete cosine transforms

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Segmentation of TEM images using oscillatory neural networks 14

Segmentation of TEM images using oscillatory neural networks

引用

14th brazilian symposium on computer graphics and image processing

作者： Fernandes, D Navaux, POA Fichtner, PFP Pontificia Univ Catolica Rio Grand do Sul Fac Engn PUCRS BR-90619900 Porto Alegre RS Brazil

ISBN: (纸本)0769513301

Oscillatory neural networks are a relatively recent approach for the problem of image segmentation. Inside of this context, the oscillator neuron of Terman-Wang is presented, which one is used as base element of an oscillatory network called LEGION (Locally Excitatory Globally Inhibitory Oscillator Network). the continuous version of the LEGION network, based on a set of differential equations, presents high computational complexity and has limited capacity of segmentation, what restricts its practical application, being adequate for implementation in parallel hardware topologies, To reduce the computational complexity in serial computers, an algorithm proposed by Terman and Wang is presented, which implies significant gain of speed in comparison to the continuous version and, in contrast, capacity to discriminate a unlimited number of segments. An interactive version of this algorithm was proposed and the results obtained in segmentation of transmission electron microscopy (TEM) images were evaluated, with the objective of measuring helium bubbles in silicon samples. As final result we found that the LEGION network presents itself as a singular alternative to solve problems of image segmentation, which provides simultaneously both spatial and temporal discrimination of segments.

关键词： image segmentation

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Improving the original Dual-T-Snakes model 14

Improving the original Dual-T-Snakes model

引用

14th brazilian symposium on computer graphics and image processing

作者： Giraldi, GA Strauss, E Oliveira, AAF Natl Lab Sci Computat LNCC BR-22651070 Rio De Janeiro Brazil

ISBN: (纸本)0769513301

the Dual-T-Snakes model plus dynammic programming (DP) techniques is an efficient methodology for boundary extraction and segmentation of 2D images. However, the original proposal of the Dual-T-Snakes suffers from difficulties for parameters choise and instabilities due to the normal force definition. Also, the proposed method to push a snake way from a local minimum is not efficient for noise images. In this paper we address these limitations. Firstly, we reduce the number of parameters without affecting the basic features of Dual-T-Snakes. Next, we propose a new normal force definition which maintains the desired features of a balloon-like one but is more stable and gives better performance. then, we propose other methods to avoid local minima based on mesh resolution, image statistics and a new region growing technique. We demonstrate these methods for artificial and cell images. Finally, in the future works, we figure out how to apply Dual-T-Snakes plus Viterbi together with non-parametric multiscale methods.

关键词： image segmentation

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Multi-bands image analysis using local fractal dimension. 14

Multi-bands image analysis using local fractal dimension.

引用

14th brazilian symposium on computer graphics and image processing

作者： Conci, A Nunes, TD Univ Fed Fluminense Inst Computacao BR-24210240 Niteroi RJ Brazil

ISBN: (纸本)0769513301

An important application of fractals is image texture analysis. the main aspect of fractal geometry used in this application is the concept of fractal dimensions to characterize the texture-scaling behavior. A new idea is presented here: the use of fractals for texture identification in multiband image analysis. this is not a simple extension of the usual characterization of multifractal. from its local dimension in gray-level images. It is related to examine the interrelationship among the image representation in bands. Moreover, each band can be seen as a set in the 3D space, which means that its fractal dimension may present results between 2 and 3. Consequently, if two bands are considered in one gathering, their structure is a set in the 4D space and its fractal dimension may present results between 2 and 4. For multi-bands image the fractal dimension upper bound can be even larger. In this work, two propositions to handle the multi-band combination are presented. Both defined for whatever combination of bands. As far as we know, no similar approach has been considered until now.

关键词： Fractal dimension

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Revisiting adaptively sampled distance fields 14

Revisiting adaptively sampled distance fields

引用

14th brazilian symposium on computer graphics and image processing, sibgrapi 2001

作者： De Figueiredo, Luiz Henrique Velho, Luiz De Oliveira, João Batista IMPA - Instituto de Matemática Pura e Aplicada Portugal Pontifícia Universidade Católica do Rio Grande do Sul Portugal

ISBN: (纸本)0769513301

Implicit surfaces are a powerful shape description for many applications in computer graphics. An implicit surface is defined by a function f:R3 → R as the set of points satisfying f(p)=0. Implicit representation becomes more effective when f is a signed distance function, i.e., when |f| gives the distance to the closest point on the surface and f is negative inside the object and positive outside the object bounded by the surface. the distance function to an arbitrary surface does not have a simple analytic description, and we must resort to approximations. One simple solution is to use a volumetric representation, constructed by sampling f uniformly, but such models are very large and their resolution is limited by the sampling rate. Frisken et al. (2000) proposed adaptively sampled distance fields (ADFs) as a way to overcome these problems. the authors revisit the ADFs and make two contributions to the original framework. First, we analyse the ADF representation and discuss some possible improvements. Second, we show how to compute ADFs more efficiently. © 2001 IEEE.

关键词： computer graphics

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