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Annual IEEE Symposium on computer-Based Medical Systems

作者： Andre Ferreira Bem Silva Diego Dias Bispo Carvalho Tiago H. C. Nobrega Renan Teston Inacio Aldo von Wangenheim LAPIX-Laboratory of Image Processing and Computer Graphics UFSC Federal University of Santa Catarina Florianopolis Santa Catarina Brazil

computer aided diagnostic comprises wide research areas with stability and reliability software requirements. We propose a set of libraries aiming to provide a development framework for medical applications. This framework's libraries, mostly written from scratch (e.g Core library), were developed for both medical imaging systems and general physical simulations. Their internal interactions tend to be transparent to the developer and easy to use at the same time while providing flexibility to interact with other codes. The robustness of the code is shown in complex applications like the medical workstation here exemplified, while its flexibility and fast prototyping characteristics are exemplified with some simple demonstrations.

关键词： Biomedical imaging Software libraries Application software computer applications Stability Medical services Biomedical equipment Computational modeling Medical simulation Robustness

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A new method in highway route design：joining circular arcs by a single C-Bezier curve with shape paramete

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷

作者： Hua-hui CAI Guo-jin WANG Institute of Computer Graphics and Image Processing State Key Lab of CAD & CG Zhejiang University

We constructed a single C-B zier curve with a shape parameter for G2 joining two circular arcs. It was shown that an S-shaped transition curve, which is able to manage a broader scope about two circle radii than the B zier curves, has no curvature extrema, while a C-shaped transition curve has a single curvature extremum. Regarding the two kinds of curves, specific algo- rithms were presented in detail, strict mathematical proofs were given, and the effectiveness of the method was shown by examples. This method has the following three advantages: (1) the pattern is unified; (2) the parameter able to adjust the shape of the tran- sition curve is available; (3) the transition curve is only a single segment, and the algorithm can be formulated as a low order equation to be solved for its positive root. These advantages make the method simple and easy to implement.

关键词： Transition curve Shape parameter C-Bezier curve Monotone curvature

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Learning a nonlinear color distance metric for the identification of skin immunohistochemical staining

Learning a nonlinear color distance metric for the identific...

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Annual IEEE Symposium on computer-Based Medical Systems

作者： Antonio Carlos Sobieranski Sylvio Luiz Mantelli Neto Leandro Coser Eros Comunello Aldo von Wangenheim Eduardo Cargnin-Ferreira Gabriella Di Giunta LAPIX - Laboratory of Image Processing and Computer Graphics UFSC - Federal University of Santa Catarina Pathology Service UFSC - Federal University of Santa

This paper presents a semiautomatic method for the identification of immunohistochemical (IHC) staining in digitized samples. The user trains the system by selecting on a sample image some typical positive stained regions that will be used as a reference for the construction of a distance metric. In this learning process, the global optimum is obtained by induction employing higher polynomial terms of the Mahalanobis distance, extracting nonlinear features of the IHC pattern distributions. The results of the proposed method showed a high correlation to a pathologist's manual analysis, which was used as a golden standard, presenting a more robust discrimination between stained and non-stained areas with little bias.

关键词： Skin image color analysis Immune system Proteins image processing Weather forecasting computer graphics Extraterrestrial measurements Knowledge engineering computer science

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Learning a nonlinear color distance metric for the identification of skin immunohistochemical staining

Learning a nonlinear color distance metric for the identific...

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2009 22nd IEEE International Symposium on computer-Based Medical Systems, CBMS 2009

作者： Sobieranski, Antonio Carlos Neto, Sylvio Luiz Mantelli Coser, Leandro Comunello, Eros Von Wangenheim, Aldo Cargnin-Ferreira, Eduardo Di Giunta, Gabriella LAPIX Laboratory of Image Processing and Computer Graphics UFSC Federal University of Santa Catarina Brazil CPTEC Center for Weather Forecasts and Environment Studies INPE - Brazilian Institute for Space Research Brazil EGC Knowledge Engineering Department UFSC - Federal University of Santa Catarina Brazil MCA Graduate Program in Applied Computer Science UNIVALI - Itajai Valley University Brazil Laboratory of Histological Markers Department of Biology Embriology and Genetics UFSC - Federal University of Santa Catarina Brazil Pathology Service UFSC - Federal University of Santa Catarina Brazil

ISBN: (纸本)9781424448784

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Fast two-step segmentation of natural color scenes using hierarchical region-growing and a color-gradient network

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Journal of the Brazilian computer Society 2008年第4期14卷 29-40页

作者： von Wangenheim, Aldo Bertoldi, Rafael F. Abdala, Daniel D. Richter, Michael M. Priese, Lutz Schmitt, Frank Lab for Image Processing and Computer Graphics - LAPIX Department of Computer Sciences - INE Universidade Federal de Santa Catarina - UFSC CEP 88049-200 Florianopolis - SC Brazil University of Münster Department of Computer Science Einsteinstrasse 62 D-48149 Münster Germany Department of Computer Science University of Calgary AB Canada Institut für Computervisualistik Universität Koblenz-Landau Postfach 201 602 56016 Koblenz Germany

We present evaluation results with focus on combined image and efficiency performance of the Gradient Network Method to segment color images, especially images showing outdoor scenes. A brief review of the techniques, Gradient Network Method and Color Structure Code, is also presented. Different region-growing segmentation results are compared against ground truth images using segmentation evaluation indices Rand and Bipartite Graph Matching. These results are also confronted with other well established segmentation methods (EDISON and JSEG). Our preliminary results show reasonable performance in comparison to several state-of-art segmentation techniques, while also showing very promising results comparatively in the terms of efficiency, indicating the applicability of our solution to real time problems.

关键词： Efficiency

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An Anisotropic Diffusion Filtering Implementation to Execute in Parallel Distributed Systems

An Anisotropic Diffusion Filtering Implementation to Execute...

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IEEE International Conference on Computational Science and Engineering Workshops (CSEWORKSHOPS)

作者： Antonio C. Sobieranski Leandro Coser M.A.R. Dantas Aldo v. Wangenheim Eros Comunello LAPIX-Image Processing and Graphic Computing Lab The Cyclops Group Federal University of Santa Catarina Brazil LaPeSD-Distributed Systems Research Laboratory Federal University of Santa Catarina Brazil Graduate Program Applied Computer Science Universidade do Vale do Itajaí Brazil

ISBN: (纸本)9780769532578

In this paper, we present a parallelization of a filtering algorithm related to non-linear anisotropic diffusion, used to enhance the performance of an application in a parallel distributed system. The anisotropic diffusion is a well-established technique for image enhancement by means of diffusivity functions, which act as border attenuators. However, it requires a high computational cost when a large amount of data is used. The proposed implementation was parallelized considering both point-to-point and collective communications, adopting the MPI paradigm. Results from both approaches indicate that the proposed algorithm has reached interesting levels of performance (81% and 93% of efficiency, respectively) when compared to the execution of one process in a single computer node. In addition, our results indicate an enhancement of around 21% utilizing the collective communication strategy when compared to point-to-point communication.

关键词： Filtering Magnetic separation Anisotropic magnetoresistance Ions Kernel Maximum likelihood detection Pixel

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A New Efficient Algorithm for Lossless Binary image Compression

A New Efficient Algorithm for Lossless Binary Image Compress...

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Canadian Conference on Electrical and computer Engineering (CCECE)

作者： Lele Zhou Saif Zahir Image Processing Graphics and Multimedia Lab Computer Science Department University of Northern British Columbia Canada

Binary image compression is desirable for a wide range of applications, such as digital libraries, map archives, fingerprint databases, facsimile, etc. In this paper, we present a new highly efficient algorithm for lossless binary image compression. The proposed algorithm introduces a new method, direct redundancy elimination, to efficiently exploit the two-dimensional redundancy of an image, as well as a novel dynamic context model to improve the efficiency of arithmetic coding. Simulation results show that the proposed algorithm has comparable compression ratio to JBIG standard. In many cases, the proposed algorithm outperforms the JBIG standard

关键词： image coding Arithmetic Context modeling image processing computer graphics computer science Electronic mail Multimedia databases Application software Software libraries

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A new rectangular partitioning based lossless binary image compression scheme

A new rectangular partitioning based lossless binary image c...

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Canadian Conference on Electrical and computer Engineering 2005

作者： Zahir, Saif Naqvi, Mehmood Image Processing Graphics and Multimedia Lab. Department of Computer Science UNBC Prince George BC V2N 4Z9 Canada

In this paper, we propose a lossless binary image compression scheme that can achieve high compression ratio via partitioning the black regions (one's) of the input image into rectangles. After partitioning, the top-left and the bottom-right vertices of each rectangle are identified and the coordinates of which are efficiently coded. Three different routines are used in this research. The proposed scheme is targeting images, which contain graphs and tables with solid gridlines in the background on the one hand. While on the other hand it is suitable for text images of languages where many characters have dots "nuqta" on them such as Urdu, Persian, and Arabic with big fonts. The proposed scheme has outperformed CCITT run length coding, modified READ, and REC significantly. Also it is faster and simpler to implement than the method reported in reference [6]. © 2005 IEEE.

关键词： image compression

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A near minimum sparse pattern coding based scheme for binary image compression

A near minimum sparse pattern coding based scheme for binary...

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IEEE International Conference on image processing

作者： S. Zahir M. Naqvi Image Processing Graphics and Multimedia Lab Department of Computer Science UNBC Prince George Canada

In this paper, we propose a near minimum sparse pattern coding based scheme for binary image compression. Sparse patterns such as those obtained from prediction, image differencing, and other methods can be coded efficiently using the scheme proposed in this paper. In this research we apply our scheme on coordinate representation of rectangular regions via a number of matrices. Such representations allow for efficiently coding these vertices, and hence compress the image significantly. Simulation results show that the proposed scheme outperformed previously published methods for coordinate data coding by nearly 17%. This scheme has low complexity compared with JBIG2.

关键词： image coding Block codes image processing computer graphics computer science Sparse matrices Decorrelation Probability Partitioning algorithms Standards publication

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UTILIZING FIXED-SIZE SYSTOLIC ARRAYS FOR LARGE COMPUTATIONAL PROBLEMS

UTILIZING FIXED-SIZE SYSTOLIC ARRAYS FOR LARGE COMPUTATIONAL...

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SATELLITE CONF AT THE 1988 BIANNUAL INTERNATIONAL CONF ON PATTERN RECOGNITION : RECENT ISSUES IN PATTERN ANALYSIS AND RECOGNITION

作者： PETKOV, N Int. Lab. Image Processing and Computer Graphics Central Inst. Cybernetics and Info. Processes Kurstr. 33 P.O. Box 1298 Berlin GDR-1086 Germany

A new scheme for partitioning systolic algorithms is presented. It is based on the time-sharing properties of the c-slow circuits. The technique is amenable to formalization and holds high potential for automatization... 详细信息

ISBN: (纸本)0387518150

关键词： C-slow circuits Convolution Partitioning Systolic algorithms

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