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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Changgong Zhang Martijn van de Giessen Elmar Eisemann Anna Vilanova Section of Computer Graphics and Visualization Delft University of Technology Division of Image Processing Department of Radiology Leiden University Medical Center

ISBN: (纸本)9781424479276

Compressed sensing (CS) magnetic resonance imaging (MRI) enables the reconstruction of MRI images with fewer samples in k-space. One requirement is that the acquired image has a sparse representation in a known transform domain. MR angiograms are already sparse in the image domain. They can be further sparsified through finite-differences. Therefore, it is a natural application for CS-MRI. However, low-contrast vessels are likely to disappear at high under-sampling ratios, since the commonly used l_1 reconstruction tends to underestimate the magnitude of the transformed sparse coefficients. These vessels, however, are likely to be clinically important for medical diagnosis. To avoid the fading of low-contrast vessels, we propose a user-guided CS MRI that is able to mitigate the reduction of vessel contrast within a region of interest (ROI). Simulations show that these low-contrast vessels can be well maintained via our method which results in higher local quality compared to conventional CS.

关键词： image reconstruction Magnetic resonance imaging Compressed sensing Minimization Angiography Transforms Fading

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A robust matching algorithm for active appearance models 1

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Workshops Bildverarbeitung fur die Medizin: Algorithmen - Systeme - Anwendungen, BVM 2005 - Workshop on image processing for Medicine: Algorithms - Systems - Applications, BVM 2005

作者： Beichel, Reinhard Bischof, Horst Langs, Georg Sonka, Milan Institute for Computer Graphics and Vision Graz University of Technology Inffeldgasse 16/2 A-8010 Graz Austria Pattern Recognition and Image Processing Group Vienna University of Technology Favoritenstr. 9 A-1040 Vienna Austria Department of Electrical and Computer Engineering University of Iowa Iowa City IA 52242 United States

ISBN: (数字)9783540264316

ISBN: (纸本)3540250522

This paper proposes a method for robustly matching active appearance models (AAMs) on images with gross disturbances (outliers). The method consists of two steps. First, an initial residual is calculated by comparing model and image appearance, and modes of the residual are analyzed. Second, all possible mode combinations are tested by evaluating an objective function. The objective function allows the selection of an outlier-free mode combination. Experiments demonstrate the ability of the robust matching method to successfully cope with outliers - compared to standard AAM matching, no degeneration of the model during matching occurs.

关键词： Statistics

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New graph-based text summarization method

New graph-based text summarization method

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IEEE Pacific Rim Conference on Communications, computers and Signal processing

作者： Saif alZahir Qandeel Fatima Martin Cenek CS Department UNBC Image Processing and Graphics Lab„ British Columbia Canada Computer Science and Engineering Department UAA Anchorage Alaska USA

ISBN: (纸本)9781467377898

The exponential growth of text data on the World Wide Web as well as on databases off line created a critical need for efficient text summarizers that significantly reduce its size while maintaining its integrity. In this paper, we present a new multigraph-based text summarizer method. This method is unique in that it produces a multi-edge-irregular-graph that represents words occurrence in the sentences of the target text. This graph is then converted into a symmetric matrix from which we can produce the ranking of sentences and hence obtain the summarized text using a threshold. To test our method performance, we compared our results with those from the most popular publicly available text summarization software using a corpus of 1000 samples from 6 different applications: health, literature, politics, religion, science and sports. The simulation results show that the proposed method produced better or comparable summaries in all cases. The proposed method is fast and can be implement for real time summarization.

关键词： Symmetric matrices Semantics Frequency measurement Electronic mail Companies Natural languages computers

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Automatic optic disc and optic cup detection in retinal images acquired by mobile phone

Automatic optic disc and optic cup detection in retinal imag...

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International Symposium on image and Signal processing and Analysis

作者： Renátó Besenczi Kristóf Szitha Balázs Harangi Adrienne Csutak András Hajdu Faculty of Informatics University of Debrecen Hungary Department of Computer Graphics and Image Processing University of Debrecen Hungary Department of Ophthalmology University of Debrecen Hungary

Medical image processing plays an important role in the automatic detection of certain eye diseases, disease documentation, treatment monitoring and educational purposes. The continuous improvement of the hardware of mobile phones gives us the ability to capture images like this. Interesting question can be: are these images suitable for automatic image processing, or more specifically, how much information can be obtained from this kind of images? In this paper, we would like to investigate whether a mobile device suitable to use as a medical diagnostic tool. We present a comparison between images made by a mobile device and a clinical eye examination one. We perform optic disc and optic cup detection from which we calculate cup to disc ratio. Our results show that images acquired by mobile phone are suitable for automatic image processing. Beyond these, a database of images were set up to allow researchers to test their algorithms and methods for image processing.

关键词： Retina image processing Mobile communication Mobile handsets Cameras Diseases Optical imaging

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A spreadsheet interface for visualization exploration 00

A spreadsheet interface for visualization exploration

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Proceedings of the conference on Visualization '00

作者： T. J. Jankun-Kelly Kwan-Liu Ma Computer Science Department Visualization and Graphics Research Group. Center for Image Processing and Integrated Computing University of California Davis CA

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Linear programming concept visualization

Linear programming concept visualization

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International Conference on Information Visualisation (IV)

作者： J.P. Charalambos E. Izquierdo Image Processing and Computer Graphics Research Laboratory Department of Computer Sciences National University Colombia Department of Electronic Engineering Queen Mary University of London London UK

A visualization scheme as a tool to find the solution of any 3D-linear programming problem is introduced. The presented approach is highly suitable to draw and visualize interactively the feasible region of a given 3D-linear programming problem. It can be used for a better understanding of the solution process when different methods devoted to solve the underlying problem are applied, e.g., the simplex method. The proposed technique comprises sensitive analysis during the solution process and interactive visualization of the feasible region. The analysis leading to the introduced schema also shows that the design of an appropriate and simple vertex representation is crucial to manage any order of degeneracy. To deal with this paradigm and to some extent to formalize it, the concept of adjacency invariance is introduced. Several experiments have been conducted to test and assess the performance of the introduced concepts and techniques.

关键词： Linear programming Visualization Testing computer graphics image processing Appropriate technology Stress Algorithm design and analysis

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A Novel Reversible Ternary Embedding Algorithm Based on Modified Full Context Prediction Errors

A Novel Reversible Ternary Embedding Algorithm Based on Modi...

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2016 IEEE International Conference on Signal and image processing

作者： Li Li Chin-Chen Chang K.Bharanitharan Yanjun Liu Institute of Computer Graphics and Image Processing Hangzhou Dianzi University Department of Information Engineering and Computer Science Feng Chia University The Australian National University ACT

We propose a high capacity reversible ternary embedding-watermarking algorithm based on a modification of full-context-prediction-errors(MFCPE) wherein the binary bit stream is converted to the ternary stream then error histogram shifting is utilized to embed the ternary *** the existing predictor methods, we provide a full context prediction with a modification of each pixel at most by 1, which significantly reduces *** results confirm that the proposed algorithm achieves high PSNR while providing a higher embedding ***, results indicate that MFCPE outperforms the existing methods in terms of payload and the watermarked image quality.

关键词： reversible watermarking ternary embedding histogram shifting full context prediction

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Design and development of a robotic vehicle for shallow-water marine inspections

Design and development of a robotic vehicle for shallow-wate...

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Australasian Conference on Robotics and Automation 2019, ACRA 2019

作者： Tarwadi, Parag Shiraki, Yuta Ganoni, Ori Wei, Shanghai Ahn, Ho Seok MacDonald, Bruce Centre for Automation and Robotic Engineering Science University of Auckland Auckland New Zealand School of Science and Engineering Ritsumeikan University Shiga Japan Computer Graphics and Image Processing Group University of Canterbury Christchurch New Zealand Department of Chemical and Materials Engineering University of Auckland Auckland New Zealand

Underwater marine inspections for ship hull or marine debris, etc. are one of the vital measures carried out to ensure the safety of marine structures and underwater species. This work details the design, development and qualification of a compact and economical observation class Remotely Operated Vehicle (ROV) prototype, intended for carrying out scientific research in shallow-waters. The ROV has a real-time processor and controller onboard, which synchronizes the movement of the vehicle based on the commands from the surface station. The vehicle piloting is done using the onboard Raspberry pi camera and the support of some navigation sensors like Global Positioning System (GPS), inertial, temperature, depth and pressure. This prototype of ROV is a compact unit built using a limited number of components and is suitable for underwater inspection using a single camera. The developed ROV is initially tested in a pool. © 2019 Australasian Robotics and Automation Association. All rights reserved.

关键词： Remotely operated vehicles

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QR code localization using deep neural networks

QR code localization using deep neural networks

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IEEE Workshop on Machine Learning for Signal processing

作者： Tamás Grósz Péter Bodnár László Tóth László G. Nyúl MTA-SZTE Research Group on Artificial Intelligence Hungarian Academy of Sciences and University of Szeged Department of Image Processing and Computer Graphics University of Szeged

Usage of computer-readable visual codes became common in our everyday life at industrial environments and private use. The reading process of visual codes consists of two steps, localization and data decoding. This paper introduces a new method for QR code localization using conventional and deep rectifier neural networks. The structure of the neural networks, regularization, and training parameters, like input vector properties, amount of overlapping at samples, and effect of different block sizes are evaluated and discussed. Results are compared to localization algorithms of the literature.

关键词： Training Vectors Artificial neural networks Neurons Visualization Discrete cosine transforms

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The convergence analysis for the rational Bézier curves

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Journal of Information and Computational Science 2010年第8期7卷 1643-1648页

作者： Shi, Mao Ye, Zhenglin Wang, Guozhao Kang, Baosheng Department of Applied Mathematics Northwestern Polytechnical University Xi'an 710072 China Institute of Computer Graphics and Image Processing Department of Mathematics Zhejiang University Hangzhou 310027 China Department of Computer Northwest University Xi'an 710069 China

This article considers the limit of a rational Bézier curve. Limits are considered using point-wise, uniform and L1 limits to a family of rational Bézier curves. The paper shows that a rational Bézier curve dose not uniformly converge on [0, 1] to its point-wise limit, when one of the weight goes to infinity. The goal of this paper is to clarify the ambiguity between the viewpoint of Goldman [1] and Piegl [2] on the limit of a rational Bézier curve. For that, we detail the limit in term of the different criteria. Copyright © 2010 Binary Information Press.

关键词： L1 convergence Non-uniform convergence Point-wise convergence Rational Bézier curve

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