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

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Multiscale detection of linear features in speckled imagery 16

Multiscale detection of linear features in speckled imagery

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16th brazilian symposium on computer graphics and image processing

作者： De Medeiros, FNS Costa, RCS Marques, RCP Laprano, CM Univ Fed Ceara DETI Detp Teleinformat BR-60455760 Fortaleza Ceara Brazil

ISBN: (纸本)0769520324

this work is concerned with multiscale extraction of linear features in speckled images. the methodology combines the a trous algorithm, Hough transform and the line detectors D1 and D2. the noisy image is decomposed in several scales by applying a redundant discrete wavelet algorithm (a trous) and the detectors D1 and D2 extract in each scale the straight lines. An associative symmetrical sum is used to merge information from both D1 and D2. In order to supress responses due to small isolated structures a local Hough transform is applied to each scale and the best scale results are associated by using the symmetrical sum again. Real SAR images were used to test the algorithm.

关键词： computer vision Detectors Discrete wavelet transforms Feature extraction image quality image segmentation Roads Satellites Speckle Testing

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the language LinF for fractal specification 16

The language LinF for fractal specification

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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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Cambio:: Realistic three dimensional simulation of humanoids based on computer vision and robotics 15

Cambio:: Realistic three dimensional simulation of humanoids...

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15th brazilian symposium on computer graphics and image processing

作者： Aranha, CC Carvalho, SR Gonçalvez, LMG Univ Estadual Campinas BR-13083970 Campinas SP Brazil

ISBN: (纸本)076951846X

We introduce concepts and algorithms for control of visual motor commands and realistic simulation of basic abilities as visual servoing and perception for robotics simulation. the introduced tools can also be used in a straightforward way to build computer animated devices as virtual agents, and avatars. We use the tools to build part of a humanoid (arms and head) robot, effectively named "C (a) over cap mbio". We will describe C (a) over cap mbio's design, providing an overview on the most used feature extraction techniques for perception, discussing implementation issues. We intend to show the usefulness of a simulated platform as an inexpensive alternative for testing and developing computer vision algorithms in real-time robotics applications and its possible extensions to computer animated agents and avatars.

关键词： Visual servoing

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image morphing applied to 3D reconstruction of coronal loops 16

Image morphing applied to 3D reconstruction of coronal loops

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16th brazilian symposium on computer graphics and image processing

作者： Faria, LN Mascarenhas, NDA Morón, CE Rosa, RR Sawant, HS Univ Fed Sao Carlos Dept Comp BR-13565905 Sao Carlos SP Brazil

ISBN: (纸本)0769520324

this paper presents a new approach for 3D reconstruction of X-ray tomographic images of a magnetic structure, called coronal loop, observed on the solar atmosphere by the Japanese satellite Yohkoh. In this approach, the intermediate cross sections images of the magnetic loop are generated with image morphing controlled by a Bezier curve in arc shape. In space science, this approach has an important application to obtain information about the solar explosions that may cause serious perturbations in terrestrial communication systems.

关键词： Atmosphere Communication system control Explosions image generation image reconstruction Satellites Shape control Solar power generation Tomography X-ray imaging

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Sulcal lines extraction for cortex characterization in cerebral MR images using the image foresting transform 16

Sulcal lines extraction for cortex characterization in cereb...

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16th brazilian symposium on computer graphics and image processing

作者： Castellano, G Lotufo, RA Cendes, F Univ Estadual Campinas Fac Eng Eletr & Computacao Dept Computacao & Automacao BR-13081970 Campinas SP Brazil

ISBN: (纸本)0769520324

In this work we describe an approach to extract sulcal lines from cerebral MRI data using the image Foresting Transform. this technique, based on graph theory, provides a sound framework for the implementation of many image processing operators, and has been successfully applied to the solution of many problems, including some in medical imaging. We show the results of applying the technique to slices of MRI data from four subjects and compare these to the computation of the morphological skeleton and to the conditional thickening. A shorter version of this paper has already been submitted to ICIP 2003, but the comparison to the conditional thickening has only been presented in this paper Also, we present a correction to the IFT procedure which prevents the sulcal lines from breaking.

关键词： Area measurement Data mining Hospitals Humans image processing Lesions Magnetic resonance imaging Pathology Shape thickness measurement

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image feature extraction for application of biometric identification of iris - A morphological approach 16

Image feature extraction for application of biometric identi...

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16th brazilian symposium on computer graphics and image processing

作者： De Mira, J Mayer, J Technol Educ Fed Ctr Parana CEFET PR LADESPE Dev & Res Lab BR-84016210 Ponta Grossa PR Brazil

ISBN: (纸本)0769520324

this paper presents a new approach based on morphological operators for application of biometric identification of individuals by segmentation and analysis of the iris. Algorithms based on morphological operators are developed to segment the iris region from the eye image and also to highlight chosen iris patterns. the extracted features are used to represent and characterize the iris. In order to properly extract the desired patterns, an algorithm is proposed to produce skeletons with unique paths among end-points and nodes. the representation obtained by the morphological processing is stored for identification purposes. To illustrate the efficiency of the morphological approach some results are presented. the proposed system was derived to present low complexity implementation and low storage requirements.

关键词： Biometrics Data mining Educational technology Feature extraction image segmentation Iris Laboratories Laplace equations Signal processing algorithms Wavelet transforms

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Robust multiview range image registration 16

Robust multiview range image registration

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16th brazilian symposium on computer graphics and image processing

作者： Silva, L Bellon, ORP Boyer, KL CEFET CPGEI Curitiba Parana Brazil

ISBN: (纸本)0769520324

this paper presents a new method for precise registration of multiple range images with low overlap based on Enhanced Genetic Algorithms (GAs). the proposed method minimizes the alignment error within the common overlap area among a set of views, which is computed by a novel robust evaluation metric, called the Surface Interpenetration Measure. Because they search in a space of transformations, GAs are capable of registering surfaces without need for prealignment, as opposed to methods based on the Iterative Closest Point (ICP) algorithm, the most popular to date. the experimental results confirm that the new method ensures more precise alignments than combined sequential pairwise alignments for multiview registration, providing accurate global alignment among overlapping views.

关键词： Area measurement Buildings Education Genetic algorithms image registration image restoration Iterative algorithms Iterative closest point algorithm Iterative methods Robustness

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Algorithmic shape modeling with subdivision surfaces

Algorithmic shape modeling with subdivision surfaces

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14th brazilian symposium on computer graphics and image processing

作者： Velho, L Perlin, K Biermann, H Ying, LX IMPA BR-22461320 Rio De Janeiro Brazil NYU Courant Inst Math Sci New York NY 10003 USA

We present methods for synthesizing 3D shape features on subdivision surfaces using multi-scale procedural techniques. Multi-scale synthesis is a powerful approach for creating surfaces with different levels of detail. Our methods can also blend multiple example multi-resolution surfaces, including procedurally defined surfaces as well as captured models. (C) 2002 Elsevier Science Ltd. All rights reserved.

关键词： procedural models multi-scale surfaces Catmull-Clark subdivision shape blending warping and morphing fractals signal mesh processing

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cudaIFT: 180x Faster image Foresting Transform for Waterpixel Estimation using CUDA 14

cudaIFT: 180x Faster Image Foresting Transform for Waterpixe...

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14th International Joint Conference on computer Vision, Imaging and computer graphics theory and Applications (VISAPP)

作者： Goncalves, Henrique M. de Vasconcelos, Gustavo J. Q. Rangel, Paola R. R. Carvalho, Murilo Archilha, Nathaly L. Spina, thiago, V Brazilian Ctr Res Energy & Mat Brazilian Synchrotron Light Lab Campinas SP Brazil Brazilian Ctr Res Energy & Mat Brazilian Bioscences Natl Lab Campinas SP Brazil Univ Estadual Campinas Inst Comp Campinas SP Brazil Univ Estadual Campinas Inst Geosci Campinas SP Brazil

ISBN: (纸本)9789897583544

We propose a GPU-based version of the image Foresting Transform by Seed Competition (IFT-SC) operator and instantiate it to produce compact watershed-based superpixels (Waterpixels). Superpixels are usually applied as a pre-processing step to reduce the amount of processed data to perform object segmentation. However, recent advances in image acquisition techniques can easily produce 3D images with billions of voxels in roughly 1 second, making the time necessary to compute Waterpixels using the CPU-version of the IFT-SC quickly escalate. We aim to address this fundamental issue, since the efficiency of the entire object segmentation methodology may be hindered by the initial process of estimating superpixels. We demonstrate that our CUDA-based version of the sequential IFT-SC operator can speed up computation by a factor of up to 180x for 2D images, with consistent optimum-path forests without requiring additional CPU post-processing.

关键词： image Foresting Transform GPU Watershed image Segmentation Superpixels

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three-dimensional reconstruction of urban scenes from a single image 15

Three-dimensional reconstruction of urban scenes from a sing...

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15th brazilian symposium on computer graphics and image processing

作者： Policarpo, F Azevedo, E Conci, A Paralelo Comp BR-24230191 Niteroi RJ Brazil

ISBN: (纸本)076951846X

this work presents a method to output the 3D structure of an urban area from only one aerial photo. the reconstruction is based on the inverse process done when a parallel projection is used to construct a two-dimensional image from a three-dimensional object. A new algorithm for reconstruction is developed and implemented. It recovers depth information by identification of object height on the image plane. While the 3D-objects are reconstructed, their original texture is used for rendering, using control points defined by the user. Results show that when seen from the same capture angle, the virtual 3D scene and the original picture are exactly the same. In the virtual environment of this implementation, the user can visualize, visit and interact with the structure of the 3D scenario. the spatial structure of the real world is recovered at real time;it is possible to see the 3D growing out of the 2D images.

关键词： Virtual reality

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