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Annual IEEE Symposium on Computer-Based Medical Systems

作者： Tiago H. C. Nobrega Diego Dias Bispo Carvalho Aldo von Wangenheim LAPIX - Laboratory for Image Processing and Computer Graphics UFSC - Federal University of Santa Catarina Brazil LAPIX - Laboratory for Image Processing and Computer Graphics UFSC - Federal University of Santa Catarina Florianópolis Brazil

We present a method to efficiently simulate fluid flows through tubular structures such as pipes and blood vessels. The method relies on the structure's centerline and for that purpose we present an algorithm to generate an approximate centerline of a tubular structure defined by an ordinary polygonal mesh. As an additional benefit, this center-line provides approximations of measures about the tubular structure such as length of regions of interest and cross-section diameters. The fluid is simulated with the smoothed particle hydrodynamics method and the fluid-structure interaction is simplified to provide interactive rates. The particles can be colored according to physical quantities to better visualize the evolution of the fluid's state in narrow and otherwise obstructed areas.

关键词： Visualization Biomedical imaging Computational modeling Computer simulation Fluid flow Mesh generation Solid modeling Medical simulation Magnetic resonance imaging Computed tomography

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A multi-layered development framework for medical imaging applications

A multi-layered development framework for medical imaging ap...

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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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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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Real-time Facial Features Tracker Based on Topologic Information and Similarity Analysis

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电子学报(英文版) 2008年第2期17卷 205-209页

作者： LIANG Ronghua FANG Jinglong MAO Jianfei ZHOU Delong College of Information Engineering Zhejiang University of Technology Hangzhou 310014 China State Key Laboratory of Audiovisual Information Processing Peking University Beijing 100871 China Institute of Graphics and Image Hangzhou Dianzi Universtity Hangzhou 310018 China

Real-time facial features tracking of video can be widely used in face recognition, video surveillance, face animation and Human-Computer Interaction. We present a fast tracking approach, and our method only requires simple device - a digital camera and a PC, and our approach needs limited user interactions. We first use eigenface and topologic information to detect the position and the size of face from the first frame, and facial features of the first frame are acquired automatically. The successor of the first frame can be tracked by using similarity analysis and motion estimation, the automatic tracker of first frame is also used to resolve the features occlusion problem when the tracked features disappear which is a difficult issue for tracking. Experimental results show that our approach is easily implemented, and the analysis also shows the high robustness of our method.

关键词：拓扑信息相似分析特征跟踪运动评估

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Research and Design of Drawings Retrieval System Based on Spatial Relationships and Shape

Research and Design of Drawings Retrieval System Based on Sp...

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ISECS International Colloquium on Computing, Communication, Control, and Management, CCCM

作者： Haiyu Song Pengjie Wang Xiongfei Li Houjie Li Key Laboratory of Symbol Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun Jilin China The Research Institute of Computer Graphics and Image Processing Dalian Nationalities of University Dalian Liaoning China

CAD drawings reuse is of great importance in promoting design efficiency and productivity. The ability to retrieve CAD drawings is the core of drawings reuse task. Most of the existing drawings retrieval systems rely only on text descriptions. Due to complexity of visual feature, a little system is based on content. A simplified topological relationship is proposed to describe visual features for dimension reduction. An effective topological relationship vector is constructed by graph spectra. A novel retrieval system based on visual contents, including topological relationships, shape, and directional relationships, is proposed. The experiments show that the proposed approach and system are superior to the text-based and traditional content-based retrieval systems.

关键词： Shape Feature extraction Topology Indexing Design automation Data mining Visualization

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Generic Visualization and Manipulation Framework for Three-Dimensional Medical Environments

Generic Visualization and Manipulation Framework for Three-D...

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Annual IEEE Symposium on Computer-Based Medical Systems

作者： B.S. Tani T. Nobrega T.R. dos Santos A. von Wangenheim Computer Graphics and Image Processing Laboratory Federal University of Santa Catarina Brazil

We present a visualization and manipulation framework for three-dimensional medical environments. The MVC architecture of the. framework allows the use of different API technologies such us OpenGL and DirectSD, different model representations, and controllers. This facilitates the implementation of medical applications offering resources commonly needed by such systems. Two case studies are shown as examples of such applications

关键词： Biomedical imaging Data visualization Computer architecture Engines Medical control systems Computer displays Medical services Biomedical equipment Application software Solid modeling

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A Low Complexity Wavelet-Packets Based image Signature for Indexing and Retrieval

A Low Complexity Wavelet-Packets Based Image Signature for I...

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Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Saif Zahir Computer Science Department UNBC Image Processing Multimedia and Graphics Laboratory Prince George BC Canada

image signature is a signal that is significantly shorter and simpler than the image signal and can be used to efficiently identify the original image. Generating an image signature that accurately represents an image can only be done by means of extracting specific features of the image and express it in an efficient way. In this paper, a new wavelet-packets-based (WP) image signature that can be used for image indexing and fast retrieval is proposed. This signature is generated via encoding the position of specific points of the signal that represents some statistics of the wavelet packets coefficients in the various frequency bands. Computer simulation results using nearly 7500 image signatures show that the targeted image signature was identified with a very high accuracy in a very short period of time. Also, it showed that the proposed signature is robust against geometric transformation

关键词： Wavelet packets Indexing image retrieval Signal processing image generation Feature extraction Signal generators Encoding Statistics Frequency

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A Novel Shape Coding Scheme For MPEG-4 Visual Standard

A Novel Shape Coding Scheme For MPEG-4 Visual Standard

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International Conference on Innovative Computing, Information and Control (ICICIC)

作者： Lele Zhou S. Zahir Image Processing Graphics and Multimedia Laboratory University of Northern British Columbia Prince George BC Canada

MPEG-4 standard is an object based coding scheme. Shape representation is a new feature in MPEG-4, which specifies objects' opaque characteristics. In this paper, we propose a novel shape coding scheme for MPEG-4 visual standard. The proposed coding scheme segments a binary alpha plane (BAP) into a number of binary alpha blocks (BAB) of varying sizes based on the opaque or transparent nature of a video object. The segmentation is done through a quadtree structure. The two-dimensional redundancy within a non-homogeneous BAB are exploited by removing the consecutive identical rows and columns of pixels. At the end, zigzag scan and arithmetic coding are adopted to achieve better compression. The proposed scheme bypasses the overhead in computation of an intermediate contour representation and its associated conversions. Experimental results show that the proposed coding scheme has an overall better compression performance than some other advanced coding techniques

关键词： Shape MPEG 4 Standard image coding Arithmetic Video compression image processing graphics Computer aided engineering Spline High performance computing

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APPROXIMATION MULTIDIMENSION FUCTION WITH FUNCTIONAL NETWORK

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Journal of Electronics(China) 2006年第1期23卷 81-84页

作者： Li Weibin Liu Fang Jiao Licheng Zhang Shuling Li Zongling Institute of Graphics and Image Processing Xianyang Normal University Xianyang 712000 China National Key Laboratory for Radar Signal Processing Xidian University Xi＇an 710071 China Insititute of Intelligent Information Processing Xidian University Xi＇an 710071 China

The functional network was introduced by ***, which extended the neural network. Not only can it solve the problems solved, but also it can formulate the ones that cannot be solved by traditional network. This paper applies functional network to approximate the multidimension function under the ridgelet theory. The method performs more stable and faster than the traditional neural network. The numerical examples demonstrate the performance.

关键词： Functional network Ridgelet Approximation

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