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Morphological segmentation of yeast by image analysis

image AND VISION COMPUTING 2007年第1期25卷 34-39页

作者： de Carvalho, Marco A. G. Lotufo, Roberto de A. Couprie, Michel Univ Estadual Campinas FEEC DCA BR-13083970 Campinas SP Brazil A2 SI ESIEE Cite Descartes F-93162 Noisy Le Grand France

An image analysis method has been developed to segment yeast cells. Yeasts belong to the taxonomic group fungi and have been used on fuel and food industry, for example. the method is capable of segmenting yeast cells based on Watershed Transform and space-scale analysis of the Tree of Critical Lakes. We analise hierarchical, geometric and gray-scale properties of the Tree of Critical Lakes. We show experimental results for one group of yeast images obtained from the School ofFood Engineering at Unicamp, Brazil. Comparison shows that the proposed method provides cells with area 10% lower than traditional approach. Moreover, this approach preserves the cells contour, an important feature because of the performance of bioreactors and other chemical processes are greatly influenced by their morphological character. (c) 2006 Elsevier B.V. All rights reserved.

关键词： yeast watershed scale-space image analysis

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Contour salience descriptors for effective image retrieval and analysis

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image AND VISION COMPUTING 2007年第1期25卷 3-13页

作者： Torres, R. da S. Falcao, A. X. Univ Estadual Campinas Dept Informat Syst Inst Comp BR-13084851 Sao Paulo Brazil

this work exploits the resemblance between content-based image retrieval and image analysis with respect to the design of image descriptors and their effectiveness. In this context, two shape descriptors are proposed: contour saliences and segment saliences. Contour saliences revisits its original definition. where the location of concave points was a problem, and provides a robust approach to incorporate concave saliences. Segment saliences introduces salience values for contour segments, making it possible to use an optimal matching algorithm as distance function. the proposed descriptors are compared with convex contour saliences, curvature scale space, and beam angle statistics using a fish database with 11,000 images organized in 1100 distinct classes. the results indicate segment saliences as the most effective descriptor for this particular application and confirm the improvement of the contour salience descriptor in comparison with convex contour saliences. (c) 2006 Elsevier B.V. All rights reserved.

关键词： shape analysis image processing shape saliences image foresting transform multiscale skeletonization shape exact dilation image retrieval

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Evaluating the mid-secretory endometrium appearance using hysteroscopic digital video summarization

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image AND VISION COMPUTING 2007年第1期25卷 70-77页

作者： Gaviao, Wilson Scharcanski, Jacob Univ Fed Rio Grande Sul Inst Informat BR-91501970 Porto Alegre RS Brazil

Often, it is necessary to evaluate the mid-secretory endometrium appearance in Gynecology. For this purpose, hysteroscopic videos have been used, and are of fundamental importance nowadays for diagnosis/prognosis of several uterine pathologies. these videos are continuous (non-interrupted) video sequences, usually recorded in full. However, only a few segments of the recorded videos are relevant for diagnosis/prognosis, and need to be evaluated and referenced later. this paper proposes a new technique to identify clinically relevant segments in diagnostic hysteroscopy videos and, consequently, to find images that present the best view of the endometrium details (e.g. glandular openings and vascularization). Our method produce a rich and compact video summary which supports fast video browsing. this method is based on an extension of known properties of the singular value decomposition (SVD), and it is adaptive, in the sense that it minimizes the need of parameter adjustments. Our preliminary experimental results indicate that our method produces compact video summaries containing a selection of clinically relevant video segments. these experimental results were validated by specialists. (c) 2006 Elsevier B.V. All rights reserved.

关键词： medical image analysis video summarization hysteroscopies gynecology

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Methodology for the design of NN-based month-word recognizers written on brazilian bank checks

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image AND VISION COMPUTING 2007年第1期25卷 40-49页

作者： Kapp, Marcelo N. Freitas, Cinthia O. de A. Sabourin, Robert Ecole Technol Super Montreal PQ H3C 1K3 Canada Pontificia Univ Catolica Parana Curitiba Parana Brazil

the study of handwritten words is tied to the development of recognition methods to be used in real-world applications involving handwritten words, such as bank checks, postal envelopes, and handwritten texts, among others. In this work, the focus is handwritten words in the context of brazilian bank checks, specifically the months of the year, and no restrictions are placed on the types or styles of writing or the number of writers. A global feature set and two architectures of artificial neural networks (ANN) are evaluated for classification of the words. the objectives are to evaluate the performance of conventional and class-modular multiple-layer perceptron (MLP) architectures, to develop a rejection mechanism based on multiple thresholds, and to analyze the behavior of the feature set proposed in the two architectures. the experimental results demonstrate the superiority of the class-modular architecture over the conventional MLP architecture. A rejection mechanism with multiple thresholds demonstrates favorable performance in both architectures. the feature set analysis shows the importance of the structural primitives such as concavities and convexities, and perceptual primitives such as ascenders and descenders. the experimental results reveal a recognition rate of 81.75% without the rejection mechanism, and a reliability rate 91.52% with a rejection rate of 25.33%. (c) 2006 Elsevier B.V. All rights reserved.

关键词： neural networks rejection feature selection handwritten word recognition

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Multiview range image registration using the surface interpenetration measure

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image AND VISION COMPUTING 2007年第1期25卷 114-125页

作者： Silva, L. Bellon, O. R. P. Boyer, K. L. Univ Fed Parana Ctr Politecn Dept Informat BR-81531 Curitiba Parana Brazil Ohio State Univ Dept Elect & Comp Engn Columbus OH 43210 USA

this paper presents a new method for the precise registration of multiple range images with low pairwise overlap. the method is based in enhanced genetic algorithms (GAs). the proposed technique minimizes the alignment error within the common overlap area among a set of views, which is computed by a novel robust figure of merit called the surface interpenetration measure (SIM). the key idea behind this measure is the observation that mean squared error alone is insufficient to evaluate the quality of a registration solution because it fails to account for the spatial distribution of the error. the new measure explicitly forces the solution to distribute the errors across the overlap area, producing more stable, reliable solutions that limit propagation and amplification of error in the multiview problem. Our approach is not dependent on GAs as the search mechanism, but because they search in a space of transformations, GAs are capable of registering surfaces with no need for prealignment. the need for prealignment is a major weakness of methods based on the iterative closest point (ICP) algorithm, the most popular family of methods to date. the experimental results confirm that the new method ensures more precise global alignments than combined sequential pairwise alignments for registration. (c) 2006 Elsevier B.V. All rights reserved.

关键词： range images multiview registration simulated annealing genetic algorithms robust methods surface interpenetration measure

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Mumford-Shah on the move: Region-based segmentation on deforming manifolds with application to 3-D reconstruction of shape and appearance from multi-view images

Mumford-Shah on the move: Region-based segmentation on defor...

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

作者： Jin, Hailin Yezzi, Anthony J. Soatto, Stefano Adobe Syst Inc Off Tech San Jose CA 95110 USA Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA Univ Calif Los Angeles Dept Comp Sci Los Angeles CA 90025 USA

We address the problem of estimating the shape and appearance of a scene made of smooth Lambertian surfaces with piecewise smooth albedo. We allow the scene to have self-occlusions and multiple connected components. this class of surfaces is often used as an approximation of scenes populated by man-made objects. We assume we are given a number of images taken from different vantage points. Mathematically this problem can be posed as an extension of Mumford and Shah's approach to static image segmentation to the segmentation of a function defined on a deforming surface. We propose an iterative procedure to minimize a global cost functional that combines geometric priors on both the shape of the scene and the boundary between smooth albedo regions. We carry out the numerical implementation in the level set framework.

关键词： variational methods Mumford-Shah functional image segmentation multi-view stereo level set methods curve evolution on surfaces dense shape reconstruction structure from motion visibility

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A topological framework for advancing front triangulation 16

A topological framework for advancing front triangulation

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16th brazilian symposium on computer graphics and image processing

作者： Medeiros, E Velho, L Lopes, H IMPA Rio De Janeiro Brazil

In this paper we study advancing front methods for surface reconstruction. We propose a topological framework based on handlebody theory to implement such methods in a simple and robust way. As an example of the appli... 详细信息

ISBN: (纸本)0769520324

关键词： Application software computer graphics Iterative algorithms Photography Reconstruction algorithms Robustness Solid modeling Space technology Surface reconstruction Topology

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Graphic simulation for virtual prototyping with JAVA3D 16

Graphic simulation for virtual prototyping with JAVA3D

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16th brazilian symposium on computer graphics and image processing

作者： Miranda, FR Dos Santos, CS Kogler, JE Fac SENAC BR-05051000 Sao Paulo SP Brazil

ISBN: (纸本)0769520324

this paper reports some issues involved in the construction of an interactive, interoperable application, whose primary purpose is to be used as a virtual mockup. this graphic tool was tailored for machine vision application prototyping, to cope with metrological settings of large part assemblies. Some relevant aspects of designing interactive 3D applications will be discussed, including an account of some modem graphics libraries, particularly Java 3D. the achieved results, including some interesting byproducts of this work, to be publicly distributed soon, are also presented.

关键词： Computational modeling computer graphics computer simulation image processing Java Virtual prototyping

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brazilian symposium of computer Graphic and image processing

Brazilian Symposium of Computer Graphic and Image Processing

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

ISBN: (纸本)0769520324

the proceedings contain 52 papers. the topics discussed include: an approximation for normal vectors of deformable models;a hole-filling strategy for reconstruction of smooth surfaces in range images;moving least squares multiresolution surface approximation;fast stellar mesh simplification;reliable algorithms for ray intersection in computer graphics based on interval arithmetic;a topological framework for advancing front triangulation;reconstruction using surface dedicated tensorial fields;a non-self-intersection Douglas-Peucker algorithm;the language LinF for fractal specification;creating and editing curves on subdivision surfaces;a rules-based model used to describe group dynamics for games;frequency plot and relevance plot to enhance visual data exploration;and frequency plot and relevance plot to enhance visual data exploration.

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Creating and editing curves on subdivision surfaces 16

Creating and editing curves on subdivision surfaces

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16th brazilian symposium on computer graphics and image processing

作者： Loviscach, J thöle, H Hsch Bremen Fachbereich Elektrotech & Informat D-28199 Bremen Germany

ISBN: (纸本)0769520324

Curves on spline surfaces such as NURBS have a long tradition in 3-D modeling, for instance as trimming curves or as motion paths. Now, as subdivision surfaces have become very popular we seek a method for constructing spline-like curves on subdivision surfaces, beginning with a study of the Loop scheme. By using the natural parametrization of these surfaces, we find an appropriate construction based on subdivision leading to B-spline curves. With the help of typical graphics hardware, these curves can be displayed and edited in real time on a fine approximation to the limit surface.

关键词： graphics Hardware Motion pictures Production Spline Surface reconstruction Surface topography Surface waves three dimensional displays Topology

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