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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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Loop snakes:: Snakes with enhanced topology control

Loop snakes:: Snakes with enhanced topology control

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

作者： Oliveira, A Ribeiro, S Farias, R Esperança, C Giraldi, G Univ Fed Rio de Janeiro COPPE Dept Syst Engn & Comp Sci Rio de Janeiro RJ Brazil

ISBN: (纸本)0769522270

Topologically adaptable snakes, or simply T-snakes, are a standard tool for automatically identifying multiple segments in an image. this work introduces a novel approach for controlling the topology of a T-snake. It focuses on the loops formed by the so-called projected curve which is obtained at every stage of the snake evolution. the idea is to make that curve the image of a piecewise linear mapping of an adequate class. then, with the help of an additional structure-the Loop-Tree-it is possible to decide in O(1) time whether the region enclosed by each loop has already been explored by the snake. this makes it possible to construct an enhanced algorithm for evolving T-snakes whose performance is assessed by means of statistics and examples.

关键词： image segmentation

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Interactive editing of multiresolution meshes

Interactive editing of multiresolution meshes

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

作者： Silva, FGM Gomes, AJP Univ Beira Interior Dept Comp Sci & Engn IT Networks & Multimedia Grp Covilha Portugal

ISBN: (纸本)0769522270

this paper presents a new approach for interactive editing of multiresolution meshes. Editing operations (e.g. scaling and rotation) are confined to mesh regions of interest, called sub-meshes. Also, intuitive deformation operations (e.g. tapering and twisting) as required for animation systems can be used as well, allowing the user to have control on the local deformations of mesh objects. For that, each sub-mesh is defined interactively by picking up the cells of its frontier. Alternatively, a sub-mesh can be delimited by the shortest path of edges that approximates the intersection between a mesh and a given cutting plane. In order to speed up editing operations, the mesh is first simplified, the target sub-mesh is edited, and finally the whole mesh is refined back to its original resolution. this is particularly important for large meshes.

关键词： Interactive computer graphics

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Dynamic algorithm binding for interactive walkthroughs 14

Dynamic algorithm binding for interactive walkthroughs

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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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Local scale for boundary shape description: Application in locating landmarks automatically

Local scale for boundary shape description: Application in l...

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

作者： Rueda, Sylvia Udupa, Jayaram K. Bai, Li Univ Nottingham Sch Comp Sci CMIAG Grp Jubilee CampusWollaton Rd Nottingham NG8 1BB England Univ Penn Dept Radiol Med Image Proc Grp Philadelphia PA 19104 USA

ISBN: (纸本)9780769529967

A good shape descriptor is necessary for automatically identifying landmarks on boundaries. Our method of boundary shape description is based on the notion of c-scale, which is a new local scale concept, defined at each boundary element. From this representation we can extract special points of interest such as convex and concave corners, straight lines, circular segments, and inflection points. the results show that this method gives a complete description of shape and allows the automatic positioning of mathematical landmarks, which agree with our intuitive ideas of where landmarks may be defined. this method is applicable to spaces of any dimensionality, although we have focused in this paper on 2D shapes.

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Fast stellar mesh simplification 16

Fast stellar mesh simplification

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16th brazilian symposium on computer graphics and image processing

作者： Vieira, AW Velho, L Lopes, H Tavares, G Lewiner, T PUC Rio Lab Matmidia Rio De Janeiro Brazil

ISBN: (纸本)0769520324

this paper introduces Stellar Simplification, a fast implementation of the Four-Face Cluster algorithm. In our version of this mesh simplification scheme, we adopt a probabilistic heuristic that substitutes the priority queue of the original algorithm. this made our version, in average, 40% faster In our implementation, we adopt a very concise data structure which uses only two arrays of integers to represent the surface topology. We also introduce a new scheme,to encode and decode the hierarchy of meshes generated by the simplification algorithm. this scheme can be used for progressive transmission and compression of meshes.

关键词： Application software Clustering algorithms Computational modeling computer graphics Data structures Decoding Reconstruction algorithms Redundancy Surface reconstruction Topology

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Multiscale image segmentation using wavelets and watersheds 16

Multiscale image segmentation using wavelets and watersheds

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16th brazilian symposium on computer graphics and image processing

作者： Jung, CR Univ Vale Rio Dos Sinos Ctr Ciencias Exatas & Tecnol UNISINOS BR-93022000 Sao Leopoldo RS Brazil

ISBN: (纸本)0769520324

this paper proposes a new multiscale segmentation technique based on wavelet decompositions and watersheds. the wavelet transform is applied to the image, producing detail and approximation coefficients. the watershed is applied to the approximation image at a certain resolution 2(J), and projected up to higher resolutions using the inverse wavelet transform. At lower resolutions, the segmentation captures large relevant objects, while at higher resolution more details are obtained Since downsizing is inherent to the wavelet transform, watershed segmentation is applied to a smaller image, demanding less computational time. the proposed technique appears to be robust for noisy images, even when the amount of noise is very large.

关键词： Energy resolution Filters Frequency image edge detection image resolution image segmentation Position measurement Shape measurement Size measurement Wavelet transforms

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Video segmentation by supervised learning

Video segmentation by supervised learning

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

作者： Chavez, G. Camara Cord, M. Precioso, F. Philipp-Foliguet, S. Araujo, Arnaldo de A. ENSEA 6 Ave Ponceau F-95014 Cergy Pontoise France Univ Fed Minas Gerais Dept Comp Sci BR-31270 Belo Horizonte MG Brazil

ISBN: (纸本)0769526861

In most of video shot boundary detection algorithms, proposed in the literature, several parameters and thresholds have to be set in order to achieve good results. In this paper, to get rid of parameters and thresholds, we explore a supervised classification method for video shot segmentation. We transform the temporal segmentation into a class categorization issue. Our approach defines a uniform framework for combining different kinds of features extracted from the video. Our method does not require any pre-processing step to compensate motion or post-processing filtering to eliminate false detected transitions. the experiments, following strictly the TRECVID 2002 competition protocol, provide very good results dealing with a large amount of features thanks to our kernel-based SVM classification method.

关键词： image segmentation

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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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A computer vision framework for eye gaze tracking 16

A computer vision framework for eye gaze tracking

引用

16th brazilian symposium on computer graphics and image processing

作者： Mimica, MRM Morimoto, CH Univ Sao Paulo IME Dept Ciencia Computacao Sao Paulo Brazil

ISBN: (纸本)0769520324

Eye gaze tracking (EGT) allow us to estimate the direction of gaze and the point of regard. this technique has been successfully used as pointing device in computer interfaces for people with disabilities, but significant technological advances are still required to make EGT appropriate to be used in general computer interfaces. In order to improve the EGT technology, a testbed where new devices and algorithms can be evaluated must be defined. this paper presents a survey of the methods used for EGT and organize them into a computer vision framework, that we use to support the development and evaluation of new techniques. As an example of application of the framework, the calibration function used in the EGT developed in our laboratory is tested, and the results show the precision of the method. Higher accuracy of the testing results is achieved using synthetic images generated by ray tracing, from a physically based model of the eye.

关键词： computer graphics computer interfaces computer vision Costs Head Human computer interaction image generation Mice Ray tracing Testing

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Object retrieval in image databases using image composition 16

Object retrieval in image databases using image composition

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16th brazilian symposium on computer graphics and image processing

作者： Philipp-Foliguet, S Lekkat, M UCP ENSEA Equipes Traitement Images & Signal F-95014 Cergy France

ISBN: (纸本)0769520324

this paper proposes an algorithm of image retrieval from a partial request. In order to retrieve images containing a specific object or group of objects, we use an algorithm of inexact graph matching, adapted to adjacency graphs of regions. the number of regions representing the object can be different from an image to the other. the algorithm uses a search tree in which only similar nodes are developed the adjacency and spatial relationship of regions are used to prune the tree and accelerate the retrieval. the algorithm computes a distance between graphs, allowing to rank images. this distance takes into account both the distance between region features and the relative position of regions.

关键词： Acceleration image databases image retrieval image segmentation Information retrieval Spatial databases Spatial resolution Topology Tree graphs Visual system

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