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A new unsupervised approach for the classification of multispectral data

A new unsupervised approach for the classification of multis...

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6th International conference on Information Fusion, FUSION 2003

作者： Mohamed, Refaat M. Farag, Aly A. Computer Vision and Image Processing Laboratory University of Louisville Louisville KY 40292 United States

ISBN: (纸本)0972184449

In this paper, we present a new approach for unsupervised pixel-wise classification of multispectral data. In this approach, we estimate the number of classes in a data set as well as the parameters of each class. this approach doesn't require training samples. A scene is modeled as a realization of a random field formed of a mixture distribution. We employ an EM algorithm to estimate the parameters of this mixture. the algorithm iterates to estimate the proper number of classes that compose the scene, and also the parameters of these classes. theoretically, the algorithm can be applied for arbitrary forms of distributions for the classes in the scene, either parametric or non parametric. this paper focuses on the parametric estimation case. the approach has been applied to synthetic and real world multispectral data and provided quite encouraging results compared to other classical classification approaches. © Commonwealth of Australia 2003.

关键词： Classification (of information)

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6th Robot World Cup Soccer and Rescue Competitions and conference, RoboCup 2002

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6th Robot World Cup Soccer and Rescue Competitions and conference, RoboCup 2002

ISBN: (纸本)3540406662

the proceedings contain 47 papers. the special focus in this conference is on Robot Soccer World Cup. the topics include: Constraint-based landmark localization;improving vision-based self-localization;evaluation of self-localization performance for a local vision robot in the small size league;fast image processing and flexible path generation system for robocup small size league;a modified potential fields method for robot navigation applied to dribbling in robotic soccer;using online learning to analyze the opponent’s behavior;hidden markov modeling of multi-agent systems and its learning method;learning the sequential coordinated behavior of teams from observations;towards a life-long learning soccer agent;adaptive synchronisation for a robocup agent;team formation for reformation in multiagent domains like robocuprescue;middleware for parallel agent discrete event simulation;towards robocup without color labeling;integration of advice in an action-selection architecture;the role of motion dynamics in the design, control and stability of bipedal and quadrupedal robots;lessons from robocup and TAC;learning with educational robotics;a rescue robot control architecture ensuring safe semi-autonomous operation;a framework for learning from observation using primitives;an interactive software environment for gait generation and control design of sony legged robots;real-time randomized path planning for robot navigation and towards an optimal scoring policy for simulated soccer agents.

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image analysis of newborn plantar surface for gestational age determination

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Medical image Computing and computer-Assisted Intervention, MICCAI 2003 - 6th International conference Proceedings

作者： Bellon, Olga R.P. Severich, Maurício Silva, Luciano Cat, Mônica N. L. Boyer, Kim L. Univ. Federal do Paraná Dept. Informática Curitiba/PR Brazil Ctro. Fed. de Educ. Tecnologica CPGEI Curitiba-PR Brazil Univ. Federal do Paraná Hospital de Clínicas Curitiba/PR Brazil Ohio State University Dept. Electrical Engineering Columbus OH United States

ISBN: (纸本)3540204644

We present a computational approach to support gestational age determination of premature newborns. this knowledge is fundamental to guide postnatal treatment and increase survival chances. However, current approaches are both invasive and do not generate precise results. this paper presents an original and non-invasive method to determine the gestational age based on information supplied by plantar surface images. these images present many details and patterns but to date have not received attention from the image processing community. We provide a computational tool with suitable facilities to allow the image analysis, either automatically or user-driven. Besides its importance to Neonatology, this work represents a contribution of computer vision concepts to Medical Imaging. the experimental results confirm the relationship between the plantar surface features and newborn gestational age.

关键词： image analysis

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image segmentation based on M-S energy 6

Image segmentation based on M-S energy

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6th International conference on Signal processing

作者： Tian, Y Wang, ZH Xu, HB Liu, J Huazhong Univ Sci & Technol Inst Pattern Recognit & Artificial Intelligent State Key Lab Image Proc & Intelligent Control Wuhan 430074 Peoples R China

ISBN: (纸本)0780374886

image segmentation is a fundamental problem in the fields of image processing and computer vision with numerous applications. In this paper, an integral equation model applied in image segmentation will be addressed. We discuss the links between Mumford-Shah's (M-S energy) and image segmentation. We shall develop a feasible algorithm for the variational problem. in dimension one and then extend it to dimension two (image). A few experimental results in dimension one and two will be displayed.

关键词： image segmentation computer vision variational techniques integral equations image processing computer vision image segmentation Mumford-Shah energy M-S energy variational problem integral equation model

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Contour extraction by multi-level active contour model 6

Contour extraction by multi-level active contour model

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6th International conference on Signal processing

作者： Yang, L Yang, X He, Y Shanghai Jiao Tong Univ Image Proc & Pattern Recognit Inst Shanghai 200030 Peoples R China

ISBN: (纸本)0780374886

In this paper, an innovative algorithm for object segmentation and contour extraction algorithm is proposed, where the active contour evolution based on Mumford-Shah model is performed on coarse-to-fine approach spanned by wavelet. transform. the multilevel active contour model consists of three, main parts: 1) wavelet : decomposition for obtaining Multi-scale image;2) in the top-level image wavelet-based edge detection to get an initial evolving, contour (initialization procedure);3) evolving contour based on Mumford-Shah model in each level, from top level to down level. the experiments and analysis demonstrate that the whole calculation on multi-objects contour extraction can be greatly decreased by the benefit of coarse-to-fine strategy and ideal noise resistance ability can also be expected in this algorithm.

关键词： computer vision image processing feature extraction edge detection image segmentation wavelet transforms contour extraction object segmentation multi-level active contour model Mumford-Shah model wavelet transform wavelet decomposition multi-scale image top-level image wavelet-based edge detection active contour evolution coarse-to-fine strategy ideal noise resistance ability computer vision image processing

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Using thousands of images of an object

Using thousands of images of an object

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6th Joint conference on Information Sciences

作者： Pless, R Simon, I Washington Univ Dept Comp Sci St Louis MO 63130 USA

ISBN: (纸本)0970789017

In this paper we consider the analysis of thousands of unorganized, low resolution images of an object. With very low resolution images, standard computer vision techniques of finding corresponding points and solving for image warping parameters or 3D geometry may fail. Two recent techniques in statistical pattern recognition, locally linear embedding (LLE) and Isomap, give a mechanism for finding the structure underlying point sets for which comparisons or distances are only meaningful between nearby points. We explore these methods to simultaneously compute camera position and object pose for thousands of images using nothing but a global similarity measure between images.

关键词： image processing

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Interpolating sporadic data 7th

Interpolating sporadic data

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7th European conference on computer vision (ECCV 2002)

作者： Noakes, L Kozera, R Univ Western Australia Dept Math & Stat Crawley WA 6009 Australia Univ Western Australia Dept Comp Sci & Software Engn Crawley WA 6009 Australia

ISBN: (纸本)3540437444

We report here on the problem of estimating a smooth planar curve(a) gamma : [0,T] --> R-2 and its derivatives from an ordered sample of interpolation points {gamma(t(0)),gamma(t(1)),..., gamma(t(i-1)), gamma(t(i)),..., gamma(t(m-1)), gamma(t(m))}, where 0 = t(0) < t(1) <... < t(i-1) < t(i) <... < t(m-i) < t(m) = T, and the ti are not known precisely for 0 < i < m. Such situtation may appear while searching for the boundaries of planar objects or tracking the mass center of a rigid body with no times available. In this paper we assume that the distribution of ti coincides with more-or-less uniform sampling. A fast algorithm, yielding quartic convergence rate based on 4-point piecewise-quadratic interpolation is analysed and tested. Our algorithm forms a substantial improvement (with respect to the speed of convergence) of piecewise 3-point quadratic Lagrange intepolation [19] and [20]. Some related work can be found in [7]. Our results may be of interest in computer vision and digital image processing [5], [8], [13], [141, [17] or [24], computer graphics [1], [4], [9], [10], [21] or [23], approximation and complexity theory [3], [6], [16], [22], [26] or [27], and digital and computational geometry [2] and [15].

关键词： shape image analysis and features curve interpolation

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Superquadric-based reconstruction from 2D images

Superquadric-based reconstruction from 2D images

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International conference on Signal processing Proceedings (ICSP)

作者： Weibin Liu Chao Zhang Baozong Yuan Institute of Information Science Northern Jiaotong University Beijing China Internet Application Laboratory Fujitsu Research and Development Center Company Limited Beijing China Center for Information Science Peking University Beijing China

ISBN: (纸本)0780374886

An approach for superquadric-based reconstruction from 2D images is developed, which computes and reconstructs the parametric models of the VE objects from the 2D images of the counterpart real objects. the superquadric-based hierarchical description as the universal parametric description of the 3D objects is proposed. On one hand, according to the complexity of the real objects, the superquadric curves and their deformations are implemented to fit the contour data of projection images, and the superquadric-based shape descriptions of the real objects are obtained according to the spherical product of superquadrics. On the other hand, the actual size and position are calculated by using epipolar technique for vision reconstruction from multiple uncalibrated images. Combining the two sets of parametric data, the whole superquadric-based descriptions of the real objects are obtained.

关键词： image reconstruction computer graphics computer vision Virtual reality Parametric statistics Shape control Chaos Information science Internet Laboratories

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Accelerating ray-casting for semitransparent image using bi-directional skipped distance transforms

Accelerating ray-casting for semitransparent image using bi-...

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International conference on Signal processing Proceedings (ICSP)

作者： K. Sepsirisuk P. Ungpinitpong P. Lertprasert M. Sangworasil King Mongkut''s Institute of Technology Ladkrabang Chumphon Thailand Department of Electronics Faculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand Department of Electronics Faculty of Engineering Research Center for Communications and Information Technology Bangkok Thailand

this paper shows a method for speeding up the ray-traversal process of volume viewing. the algorithm acceleration is achieved by skipping empty regions defined for each background voxel of the volume in pre-processing step. Background voxels are labeled by a value, which is equal to the voxel distance to the nearest foreground voxel. the algorithm starts by backward traverse of the volume to find an existing point of the foreground and follows by forward traverse of the volume from an entry point of volume until it meets the existing point. this method enables a faster ray-traversal time than traditional distance transforms.

关键词： Acceleration Bidirectional control Rendering (computer graphics) Surface reconstruction Pixel Visualization Casting Cities and towns Information technology image reconstruction

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3D shape recovery based on tomography

3D shape recovery based on tomography

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International conference on Signal processing Proceedings (ICSP)

作者： W. Withayachumnankul C. Pintavirooj M. Sangworasilp K. Hamamoto Department of Electronics King Mongkut's Institute of Technology Ladkrabang Ladkrabang Bangkok Thailand Department of Electronics Faculty of Engineering Research Center for Communication and Information Technology King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand Department of Communications Engineering Tokai University Hiratsuka Kanagawa Japan

the tomographic process is quite a novel tool for the 3D image reconstruction. In a reconstruction process, a sequence of photographic images is first captured around an object of interest. Filtered backprojection is repeatedly performed on each row in the digitized images, yielding a stack of cross-sectional images. For better visualization, a surface-rendering technique and a lighting model are implemented on the voxels of the cross-sectional images to obtain a 3D shape that resembles the original object. this method has advantages over conventional 3D image reconstruction methods in that it never has to solve a complicated correspondence problem, and only simple equipment is required for gathering data from the object. Various objects have been tested. the only unresolved problem is that the method fails to reconstruct highly concave-shaped objects. We also include a solution for a ring-like shape of the cross-sectional images problem.

关键词： Shape image reconstruction Surface reconstruction Layout Rendering (computer graphics) Visualization Biomedical imaging Computed tomography Information technology Testing

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