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检索条件"任意字段=15th Brazilian Symposium on Computer Graphics and Image Processing"

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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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Segmentation of images of yeast cells by scale-space analysis 16

Segmentation of images of yeast cells by scale-space analysi...

引用

16th brazilian symposium on computer graphics and image processing

作者： Carvalho, MAG Lotufo, RA Couprie, M Univ Estadual Campinas FEEC DCA BR-13083970 Campinas SP Brazil

ISBN: (纸本)0769520324

this paper presents an hierarchical approach to segment images of yeast cells based on watershed and space-scale analysis. Yeasts belong to an important fungi class and the performance of bioreactors and other chemical processes are greatly influenced by their morphological character the method proposed is capable of segmenting yeast cells based on the analysis of survival time, shape and gray-scale features of the Tree of Critical Lakes. We show experimental results for one group of yeast images obtained from the School of Food Engineering at Unicamp, Brazil. Preliminary comparison shows that the proposed method provides cells with area 10% lower than traditional approach, as well as its contours preserved.

关键词： Bioreactors Biotechnology Chemical processes Fungi Gray-scale image analysis image segmentation Lakes Production Shape

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Music icons: Procedural glyphs for audio files

Music icons: Procedural glyphs for audio files

引用

19th brazilian symposium on computer graphics and image processing (SIBGRAPI 2006)

作者： Kolhoff, Philipp Preuss, Jacqueline Loviscach, Joern Univ Appl Sci Hsch Bremen Fachbereich Elektrotech & Informat D-28199 Bremen Germany

ISBN: (纸本)0769526861

Nowadays, a personal music collection may comprise thousands of MP3 files. Visualization can help the user to gain an overview and to find similar songs inside so large a set. We describe a method to create icons from audio files in such a way that songs which the user considers similar receive similar icons. this allows visual data mining in standard directory listings of window-based operating systems. the icons consist of bloom-like shapes, whose form and color depend on eight parameters. these parameters are controlled through a neural net, the input of which are audio features that are extracted algorithmically from the MP3 files. To adapt the system to the user's perception and interests, the neural net is initially trained with a small set of songs and icons. User studies done on the system demonstrate a strong perceptual relation between music and icons.

关键词： computer music

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An approximation for normal vectors of deformable models 16

An approximation for normal vectors of deformable models

引用

16th brazilian symposium on computer graphics and image processing

作者： Wu, ST De Melo, VF Univ Estadual Campinas UNICAMP Sch Elect & Comp EngnFEEC Dept Ind Automat & Comp EngnDCA BR-13083970 Campinas SP Brazil

ISBN: (纸本)0769520324

A physically-based deformable model proposed by Terzopoulous et al. is governed by the Lagrange's form, that establishes the relation between the dynamics of deformable models under the influence of applied forces. the net instantaneous potential energy of deformation is derived on the basis of the geometric properties, namely the first and second fundamental forms. For simplicity, the normal vector at each sample point is approximated by the second derivative. In this paper we present another approximation for the normal vector which offers better visual simulation. Some comparisons are given.

关键词： Automation computer industry Deformable models Differential equations Lagrangian functions Mathematics Partial differential equations Surface resistance Tensile stress Vectors

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Multiscale detection of linear features in speckled imagery 16

Multiscale detection of linear features in speckled imagery

引用

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

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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image morphing applied to 3D reconstruction of coronal loops 16

Image morphing applied to 3D reconstruction of coronal loops

引用

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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On determining a signature for skeletal maturity 14

On determining a signature for skeletal maturity

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

Image feature extraction for application of biometric identi...

引用

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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