Proceedings. 17th Brazilian Symposium on Computer Graphics and Image Processing

20-20 Oct. 2004

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  • Proceedings. 17th Brazilian Symposium on Computer Graphics and Image Processing

    Publication Year: 2004
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  • Front and back cover image credits

    Publication Year: 2004, Page(s): ii
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  • Proceedings XVII Brazilian Symposium On Computer Graphics And Image Processing

    Publication Year: 2004, Page(s): iii
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  • Copyright page

    Publication Year: 2004, Page(s): iv
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  • Table of contents

    Publication Year: 2004, Page(s):v - viii
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  • Preface

    Publication Year: 2004, Page(s): ix
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  • Conference committees

    Publication Year: 2004, Page(s): x
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  • Program Committee

    Publication Year: 2004, Page(s): xi
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  • Reviewers

    Publication Year: 2004, Page(s):xii - xiii
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  • An adaptive approach to mammographic image denoising and enhancement

    Publication Year: 2004, Page(s):2 - 9
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (507 KB) | HTML iconHTML

    This paper describes a new method for mammographic image noise suppression and enhancement based on the wavelet transform. At each resolution, coefficients associated with noise are modelled by Gaussian random variables; coefficients associated with edges are modelled by generalized Gaussian random variables, and a shrinkage function is assembled based on posterior probabilities. The shrinkage fun... View full abstract»

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  • Segmentation of clinical structures from images of the human pelvic area

    Publication Year: 2004, Page(s):10 - 16
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB) | HTML iconHTML

    The radiotherapy treatment planning requires the delineation of the therapy structures that will be submitted to the radiation beams. When executed manually, this delineation is a slow process and can result in human errors due to the amount of X-ray computed tomography (CT) images that are analyzed in each radiotherapy planning. This process needs precision, minimizing the radiation on healthy ar... View full abstract»

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  • An image-matching approach to protein similarity analysis

    Publication Year: 2004, Page(s):17 - 24
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (659 KB) | HTML iconHTML

    In this work we model the problem of identifying how close structurally two proteins are as a problem of measuring the similarity between color images that represent their contact maps, where the chromatic information encodes the chemical nature of the contacts. We study two conceptually distinct methods to measure the similarity between such contact maps: a content-based image retrieval one and a... View full abstract»

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  • Image formation in vibro-acoustography with sector array transducers

    Publication Year: 2004, Page(s):25 - 32
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (766 KB) | HTML iconHTML

    This paper presents the image formation process in vibro-acoustography for systems based on sector array transducers. These transducers are an alternative to annular concave transducers. They represent an innovative technique deserving detailed assessment in vibro-acoustography applications. The system point-spread function (PSF) is defined in terms of the acoustic emission of a point-target in re... View full abstract»

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  • OGRE - open gestures recognition engine

    Publication Year: 2004, Page(s):33 - 40
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (375 KB) | HTML iconHTML

    In this paper, we describe a hand gesture recognition engine based on computer vision (CV), as a computing platform to support gesture interaction between humans and computers. Presenting a simple approach to recognizing gestures through image processing techniques and a single video camera, we address the problem of generic hand gestures recognition, especially of spelled sign language hand poses... View full abstract»

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  • Informed position based watermarking

    Publication Year: 2004, Page(s):42 - 49
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (369 KB) | HTML iconHTML

    In this work we propose improvements to the preliminary investigation on position based watermarking by proposing an informed insertion approach. In addition, we see how these modifications bring even higher fidelity in comparison to the original work, and how the system may become reasonably robust to some common image processing operations. Regarding robustness, we show how the proposed system m... View full abstract»

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  • Level lines continuation based digital inpainting

    Publication Year: 2004, Page(s):50 - 57
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (706 KB) | HTML iconHTML

    Inpainting digital models have been since the late 1990s a powerful image reconstruction tool for missing data. After the original work of Bertalmio et al. (2000) several different approaches have been used to tackle the problem. Some are based on partial differential equations to model a transport process and a diffusion process, others are based on the Euler elastica functional. This paper prese... View full abstract»

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  • Detection of lines using hierarchical region based representation

    Publication Year: 2004, Page(s):58 - 64
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (666 KB) | HTML iconHTML

    This paper suggests an hierarchical region based representation to implement detection of shapes in gray-scale images. The max-tree structure has been demonstrated to be useful for this purpose, offering a semantic objects vision of the image, thereby reducing the number of elements to process in relation to the pixel based representation. In this way, particular thresholding information, associat... View full abstract»

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  • Image segmentation by tree pruning

    Publication Year: 2004, Page(s):65 - 71
    Cited by:  Papers (6)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (581 KB) | HTML iconHTML

    The image foresting transform (IFT) has been proposed for the design of image operators based on connectivity. The IFT reduces image processing problems into a minimum-cost path forest problem in a graph derived from the image. It has been successfully used for image filtering, segmentation, and analysis. In this work, we propose a novel image operator which solves segmentation by pruning trees of... View full abstract»

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  • A robust linear-parabolic model for lane following

    Publication Year: 2004, Page(s):72 - 79
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (626 KB) | HTML iconHTML

    In this paper we address the problem of lane detection and lane tracking. A linear model is used to approximate lane boundaries in the first frame of a video sequence, using a combination of the edge distribution function and the Hough transform. A new linear-parabolic model is used in the subsequent frames: the linear part of the model is used to fit the near vision field, while the parabolic mod... View full abstract»

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  • Handwritten recognition with multiple classifiers for restricted lexicon

    Publication Year: 2004, Page(s):82 - 89
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (437 KB) | HTML iconHTML

    This paper presents a multiple classifier system applied to the handwritten word recognition (HWR) problem. The goal is to analyse the influence of different global classifiers taken in isolation as well as combined in a particular HWR task. The application proposed is the recognition of the Portuguese handwritten names of the months. The strategy takes advantage of the complementary mechanisms of... View full abstract»

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  • Postal envelope address block location by fractal-based approach

    Publication Year: 2004, Page(s):90 - 97
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB) | HTML iconHTML

    In this paper we propose an approach based on fractal dimension to automatically locate address blocks in postal envelopes. First, the fractal dimension of each pixel of a postal envelope image is computed using the 2D variation procedure. The K-means clustering technique is then used to label pixels as background, noise and semantic objects like stamps, postmarks, and address blocks. A database c... View full abstract»

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  • Segmentation with active contours: a comparative study of B-spline and level set techniques

    Publication Year: 2004, Page(s):98 - 105
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (519 KB) | HTML iconHTML

    The active contours approach is an oft-used family of techniques in image analysis. This work presents a comparative study between two active contour approaches for image segmentation. The level sets method and deformable contours under B-spline representation are compared. These image segmentation methods have different features and are difficult to compare in terms of performance, accuracy and i... View full abstract»

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  • Skeletonization of two-dimensional shapes via fast numerical calculation of vector fields

    Publication Year: 2004, Page(s):106 - 112
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (483 KB) | HTML iconHTML

    We propose an approach for efficient two-dimensional skeletonization of binary shapes through numerical calculation of vector fields and curvature estimation by using the Weingarten formulae. It can be shown that potential valleys generated by vector fields have a close relationship with the definition of intensity axis of symmetry. Given a binary image, the algorithm consists in generating a gray... View full abstract»

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  • Rectangle detection based on a windowed Hough transform

    Publication Year: 2004, Page(s):113 - 120
    Cited by:  Papers (48)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (557 KB) | HTML iconHTML

    The problem of detecting rectangular structures in images arises in many applications, from building extraction in aerial images to particle detection in cryo-electron microscopy. This paper proposes a new technique for rectangle detection using a windowed Hough transform. Every pixel of the image is scanned, and a sliding window is used to compute the Hough transform of small regions of the image... View full abstract»

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  • Reconnection of fingerprint ridges based on morphological operators and multiscale directional information

    Publication Year: 2004, Page(s):122 - 129
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (857 KB) | HTML iconHTML

    In this paper we introduce a multiscale operator which, together with some morphological tools, can be used to reconnect broken components of an image. This operator extracts the orientation field from the image components and can be applied to both binary and gray-scale pictures. Although we illustrate its application in the fingerprint domain, the approach described here can be easily extended t... View full abstract»

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