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Hand image segmentation in video sequence by GMM: a comparative analysis

Hand image segmentation in video sequence by GMM: a comparat...

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

作者： Ribeiro, Hebert Luchetti Gonzaga, Adilson Univ Sao Paulo Sch Engn Sao Carlos Sao Carlos SP Brazil

ISBN: (纸本)0769526861

this paper describes different approaches of realtime GMM (Gaussian Mixture Method) background subtraction algorithm using video sequences for hand image segmentation. In each captured image, the segmentation takes place where pixels belonging to the hands are separated from the background based on background extraction and skin-color segmentation. A time-adaptive mixture of Gaussians is used to model the distribution of each pixel color value. For an input image, every new pixel value is checked, deciding if it matches with one of the existing Gaussians based on the distance from the mean in terms of the standard deviation. the best matching distribution parameters are updated and its weight is increased. It is assumed that the values of the background pixels have low variance and large weight. these matched pixels, considered as foreground, are compared based on skin color thresholds. the hands position and other attributes are tracked by frame. that enables us to distinguish the hand movement from the background and other objects in movement, as well as to extract the information from the movement for dynamic hand gesture recognition.

关键词： image segmentation

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Wrapper approach to select a subset of color components for image segmentation with photometric variations

Wrapper approach to select a subset of color components for ...

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20th brazilian symposium on computer graphics and image processing (SIBGRAPI 2007)

作者： de Castro Jorge, Lzicio Andre Ruiz, Henrique de Souza Ferreira, Ednaldo Jose Gonzaga, Adilson Embrapa Instrumetacao Agropecuaria Rua 15 Novembro1452C P 741 BR-13560970 Sao Carlos SP Brazil Univ Sao Paulo Dept Elect Engn Engn Electr BR-13566590 Sao Carlos SP Brazil EESC USP Dept Elect Engn BR-13566590 Sao Carlos SP Brazil

ISBN: (纸本)9780769529967

the choice of a color model is of great importance for many computer vision algorithms. However, there are many color models available;the inherent difficulty is how to automatically select a single color model or, alternatively, a subset of features from several color models producing the best result for a particular task. To achieve proper colors components selection, in this paper, it was proposed the use of wrapper method, a data mining approach, to obtain repeatability and distinctiveness in segmentation process. the result was compared with neural network method and yields good feature discrimination. the method was verified experimentally with 108 images from Amsterdam Library of Objects images (ALOI) and 10 aerial images with different photometric conditions. Furthermore, it has shown that the color model selection scheme provides a proper balance between color invariance (repeatability) and discriminative power (distinctiveness).

关键词： image segmentation

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Segmentation into fuzzy regions using topographic distance 14

Segmentation into fuzzy regions using topographic distance

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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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Analytic antialiasing for selective high fidelity rendering

Analytic antialiasing for selective high fidelity rendering

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18th brazilian symposium on computer graphics and image processing (SIBGRAPI 2005)

作者： Longhurst, P Debattista, K Gillibrand, R Chalmers, A Univ Bristol Dept Comp Sci Bristol BS8 1UB Avon England

ISBN: (纸本)0769523897

images rendered using global illumination algorithms are considered amongst the most realistic in 3D computer graphics. However this high fidelity comes at a significant computational expense. A major part of this cost arises from the sampling required to eliminate aliasing errors. these errors occur due to the discrete sampling of continuous geometry space inherent to these techniques. In this paper we present a fast analytic method for predicting in advance where antialiasing needs to be computed. this prediction is based on a rapid visualisation of the scene using a GPU, which is used to drive a selective renderer We are able to significantly reduce the overall number of anitialiasing rays traced, producing an image that is perceptually indistinguishable from the high quality image at a much reduced computational cost.

关键词： image retrieval

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Texture feature neural classifier for remote sensing image retrieval systems 15

Texture feature neural classifier for remote sensing image r...

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15th brazilian symposium on computer graphics and image processing

作者： Martins, MP Guimaráes, LNF Fonseca, LMG INPE Lab Associado Computacao & Matemet Aplicada BR-12227010 Sao Jose Dos Campos Brazil

ISBN: (纸本)076951846X

Texture information is useful for image data browsing and retrieval. the goal of this paper is to present a texture classification system for remote sensing images addressed to the administration of great collections of those images. the proposed classifier is a hybrid system composed by an unsupervised neural network and a supervised one. Starting from a small portion of the image (pattern) the system should recognize the most similar class to a pattern in a database as well as to identify the images that contain similar patterns. the texture feature vectors used to characterize the patterns are obtained from the images processed by a bank of Gabor Filters. Some experimental results using textures of the Brodatz album, multi-spectral and radar images are presented here.

关键词： Gabor filters

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Texture segmentation considering multiband, multiresolution and affine invariant roughness 16

Texture segmentation considering multiband, multiresolution ...

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16th brazilian symposium on computer graphics and image processing, SIBGRAPI 2003

作者： De Oliveira Nunes, É. Conci, A. Instituto de Computação UFF R Passo da Pátria 156 NiteróiRJ24210-240 Brazil

ISBN: (纸本)0769520324

Texture segmentation is a basic task in the process of satellite image analysis. However, texture characterization is not an easy task specially when more than one wavelength band need to be considered. Several difficulties are present, as the basic texture definition in different resolution and image scales. Consequently, some approaches are essentially empiric and should be adjusted to different needs. We present a new method for combining multiband information for texture segmentation. It is based on an extension of fractal dimension analyze of texture for multi channel and is rotational invariant this method allow texture classification of thematic maps made from combination of N wavelength bands. the method was validated comparing its results with others implementations using mosaic of natural textures and real satellite images. © 2003 IEEE.

关键词： image segmentation

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A locally adaptive edge-preserving algorithm for image interpolation 15

A locally adaptive edge-preserving algorithm for image inter...

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15th brazilian symposium on computer graphics and image processing

作者： Rodrigues, L Borges, DL Gonçalves, LM Univ Fed Goias Escola Eng Eletr & Computacao BR-76405220 Goiania Go Brazil

ISBN: (纸本)076951846X

Digital image interpolation techniques are frequently used to enlarge pictures, i.e. zooming in, and they are upon increasingly demand for developing product applications using digital still cameras. One common difficulty with conventional interpolation techniques is that of preserving details, i.e. edges, and at the same time smoothing the data for not introducing spurious artifacts. A definitive solution to this is still an open issue, although there are working methods in the market, see e.g. Parker et. al. [6], Sakamoto et. al. [8] for recent surveys. In this paper we propose a locally adaptive edge-preserving algorithm for image interpolation, which deals with this problem, and different than other methods shows how to compute local thresholds preserving edges and not destroying smoothness at the same time.

关键词： Interpolation

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Curvature dependent polygonization of implicit surfaces

Curvature dependent polygonization of implicit surfaces

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17th brazilian symposium on computer graphics and image processing/2nd Ibero-American symposium on computer graphics

作者： de Araújo, BR Jorge, JAP Univ Tecn Lisboa IST INESCID Dept Informat Syst & Comp Engn P-100029 Lisbon Portugal

ISBN: (纸本)0769522270

We present an algorithm for polygonizing closed implicit surfaces, which produces meshes adapted to the local curvature of the surface. Our method is similar to, but NOT based on, Marching Triangles, in that we start from a point on the surface and develop a mesh from that point using a surface-tracking approach. In a marked departure from previous approaches, our meshes approximate the surface through heuristics relying on curvature. Furthermore, our method works completely on-the-fly, resolving cracks as it proceeds, without the need for any post-remeshing step to correct failures. We have tested the algorithm with three different representations of implicit surfaces, Variational, analythical and MP U, using non-trivial data sets, yielding results that illustrate the flexibility and scalability of our technique. Performance comparisons with variants of Marching Cubes show that our approach is capable of good accuracy and meshing quality without sacrificing computing resources.

关键词： computer graphics

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Music icons: Procedural glyphs for audio files

Music icons: Procedural glyphs for audio files

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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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Modeling and rendering of individual feathers

Modeling and rendering of individual feathers

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15th brazilian symposium on computer graphics and image processing

作者： Franco, CG Walter, M Univ Vale do Rio dos Sinos PIPCA Mestrado Computacao Aplicada Sao Leopoldo RS Brazil

ISBN: (纸本)076951846X

We present a model for geometric modeling and rendering of individual feathers for computer graphics purposes. the model represents the feather structure with a collection of parameterized Bezier curves. this parametrization allows easy generation of the existent types of feather structures with biologically-motivated parameters. Once the feather structure is defined, the feathers can be rendered either in a non-photorealistic rendering style or using texture mapping to achieve a more natural look.

关键词： Rendering (computer graphics)

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