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Coding of arbitrarily shaped objects using pace code

Coding of arbitrarily shaped objects using pace code

引用

International symposium on image and Signal processing and Analysis

作者： Hsin-Tzung Wu Yukon Chang Chaur-Heh Hsieh Department of Computer Science & Information Engineering I-Shou University Kaohsiung Taiwan

ISBN: (纸本)9539676924

Pace code, a new technique for the shape coding in object-based image technology is presented in this article. It is a lossless, contour-based scheme in which contour pels on the shape contour curve are encoded directly. Similar to the well-known chain code, our method encodes the spatial relation between pels on the neighboring shape contour curve, but it uses a concept called pace which records the relationship differently. Experiment result shows that the proposed algorithm has the best coding efficiency among most contour-based schemes and requires low coding computation.

关键词： image coding Shape Layout Costs TV Motion pictures Transportation image analysis Signal analysis image storage

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Precise 3D measurements with a high resolution stereo head

Precise 3D measurements with a high resolution stereo head

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International symposium on image and Signal processing and Analysis

作者： A. Gasteratos R. Martinotti G. Metta G. Sandini Lab. for Integrated Adv. Robotics Genoa Univ. Italy Laboratory for Intergrated Advanced Robotics Department of Communication Computer and System Science University of Genova Genoa Italy

ISBN: (纸本)9539676924

We investigate a method to obtain accurate 3D measurements and we compare it with a standard photogrammetry method. The method utilizes a closed-loop to bring the point under measure in the middle of the two images of a stereo pair. It uses poor calibrated cameras and the accuracy of the measurements relies on the high resolution of the stereo head encoders and on its calibration as well. Experimental results have shown that the proposed method is more accurate than the standard photogrammetry method, as well as it is more robust to small variations of the initial position of the cameras.

关键词： Cameras Calibration Robustness Head Machine vision Equations Laboratories Robot kinematics Communication standards Measurement standards

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Detection and classification of MS using magnetisation transfer ratio images

Detection and classification of MS using magnetisation trans...

引用

International symposium on image and Signal processing and Analysis

作者： J. Dehmeshki A.C. Ruto G.J.M. Parker S. Arridge D.H. Miller P.S. Tofts Department Clinical Neurology Institute of Neurology NMR Research Unit University College London London UK Department Computer science University College London London UK

ISBN: (纸本)9539676924

Principal component (PCA) and multiple discriminant analysis (MDA) are applied to magnetization transfer ratio (MTR) images in multiple sclerosis (MS). PCA and MDA are used to characterise subtle diffuse changes in MS. PCA is applied to MTR histograms to identify regions of significant variation. These areas are indicated as possible lesion areas. We compare two classifiers to recognise differences between normal controls and different types of MS disease; a Bayesian classifier is trained in PC space, and the histogram space is transformed to the optimal discriminant space for a nearest neighbor classifier.

关键词： Magnetization Multiple sclerosis Principal component analysis Histograms image analysis Magnetic analysis Lesions Optimal control Diseases Bayesian methods

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Analysis of Growing Ductile Cracks Using computer image processing 22

引用

22nd National symposium on Fracture Mechanics, NSFM 1990

作者： Yagawa, Genki Yoshimura, Shinobu Yoshioka, Akira Pyo, Chang-Ryul Department of Nuclear Engineering University of Tokyo Bunkyo Tokyo113 Japan

ISBN: (纸本)9780803114401

This paper is concerned with a study of growing crack-tip behaviors in ductile materials using the hybrid experimental and numerical method by means of a computer image processing technique. Here, a displacement field near a crack tip is first measured by the image processing technique. Combined with a finite element technique, the strain, the stress, the near-crack-tip J-integral, and the crack-tip singular field are evaluated from the measured displacement field. In this procedure, elastic unloading phenomena occurring around a growing crack tip, which may play important roles in the near-crack-tip behaviors, are also evaluated and are taken into account in evaluating the near-crack-tip J-integral. The present method is applied to the analyses of a growing ductile crack in a tensile (CT) specimen made of Type 304 stainless steel. The transition behaviors of the crack-tip singular field, the elastic unloading, and the near-crack-tip J-integral in accordance with crack growth are discussed in detail through the comparison between experimental and theoretical results. © 1992 by ASTM International.

关键词： Crack tips

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ABSORPTION CALORIMETRY And LASER-IndUCED DAMAGE THRESHOLD MEASUREMENTS OF AR-COATED ZNSE And METAL MIRRORS AT 10.6-MU-M 22

引用

22nd ANNUAL BOULDER DAMAGE SYMP - LASER-IndUCED DAMAGE IN OPTICAL MATERIALS

作者： RAHE, M OERTEL, E REINHARDT, L RISTAU, D WELLING, H LASER ZENTRUM HANNOVER E V W-3000 HANNOVER 1 GERMANY

ISBN: (纸本)0819405329

Absorption and pulsed laser induced damage of antireflective coatings on ZnSe and high reflecting metal mirrors were studied. As deposition materials for the AR-coatings germanium, zinc sulfide, zinc selenide, cadmium selenide and different fluorides were selected. For protecting and enhancing of metal mirrors zinc sulfide and zinc selenide were used in conjunction with ThF4 as low index material. The films were deposited by thermal evaporation. Absorption measurements were performed with the aid of a laser calorimeter and a cw CO2-laser. Single-shot and multiple-shot (prf, 3 Hz) damage thresholds were measured by a computer controlled test facility using 100 ns pulses from a TEA CO2-laser. The gaussian beam was focussed down to a diameter of 1.4 mm on the sample surface. A scatter measurement system and an on-line video microscope were applied for damage detection. Damage morphology was investigated by Nomarski- and scanning electron microscopy. Copyright © 1991 by ASTM International.

关键词： CO2-LASER LASER IndUCED DAMAGE SINGLE-SHOT MULTIPLE-SHOT LASER CALORIMETRY PHOTOTHERMAL DEFLECTION SPECTROSCOPY AR-COATING METAL MIRROR VIDEO image processing

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Proceedings of the 22nd Southeastern symposium on System Theory

Proceedings of the 22nd Southeastern Symposium on System The...

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Proceedings of the 22nd Southeastern symposium on System Theory

ISBN: (纸本)0818620382

The proceedings contains 127 papers. The following topics are dealt with: pattern recognition;modeling and simulation;circuits and networks;robotics;advanced control algorithms and environments;parallel processing;image processing hardware;identification;electromagnetics applications;control systems applications;telecommunication systems;estimation;control of electrical machines;control, sensors, and actuators for space-based experiments;computer-aided design and testing;control system design;microprocessors and applications;artificial neural networks and expert systems;system theory;power electronics and power quality;VLSI;digital signal processing;multisensor fusion;power system analysis;and optical systems.

关键词： Systems Science and Cybernetics

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Optical flow from a single image

Optical flow from a single image

引用

Proceedings of the 22nd Southeastern symposium on System Theory

作者： Labuz, Jeffrey Center for Machine Intelligence Univ of South Carolina Columbia SC USA

ISBN: (纸本)0818620382

An NTSC RS-170 standard image of a dynamic scene usually exhibits a 60-Hz flicker when displayed on a CRT. This is because the two interlaced fields of the image are captured 1/60 of a second apart, and the scene has changed slightly in that interval. It is shown how a shift between the two fields of a time-varying image can be accurately measured and corrected using optical flow techniques of image processing. Experimental results illustrate the effectiveness of the proposed field-shift correction algorithm.

关键词： image processing

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Feature extraction using an optical scanning system

Feature extraction using an optical scanning system

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Proceedings of the 22nd Southeastern symposium on System Theory

作者： Duncan, B.D. Pieper, R.J. Poon, T.-C. Optical Image Process Lab Virginia Polytech Inst & State Univ Blacksburg VA USA

ISBN: (纸本)0818620382

Real-time image processing has been achieved by using an optical scanning system in conjunction with electronic hardware. A report of experimental results on edge extraction and image thresholding for transmissive objects is presented. Advantages and limitations of the techniques are identified. The results indicate that real-time edge extraction and image thresholding can be satisfactorily achieved.

关键词： image processing

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Parallel image processing on a transputer-based system

Parallel image processing on a transputer-based system

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Proceedings of the 22nd Southeastern symposium on System Theory

作者： Peng, Antai Kawamura, Kazuhiko Center for Intelligent Syst Vanderbilt Univ Nashville TN USA

ISBN: (纸本)0818620382

The problem addressed is how to use transputer networks for image processing. As is well known, SIMD (single instruction/multiple data) or MIMD (multiple instruction/multiple data) architectures are very useful in parallel computing. The authors describe how to use transputers as an SIMD or MIMD machine to implement parallel image processing. Several image-processing algorithms, including Laplacian of Gaussian, edge detection, region labeling, generalized Hough transform, and thinning, have been tested. The authors maintain that transputer-based systems are suitable for real-time image processing. It is also pointed out that, compared with the other parallel machines, transputer systems can provide high performance and more flexibility with relatively low cost.

关键词： image processing

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The hybrid image processing/expert image analysis system

The hybrid image processing/expert image analysis system

引用

Proceedings of the 22nd Southeastern symposium on System Theory

作者： Kim, Jung H. Park, Eui H. Ntuen, Celestine Sohn, Kwang H. Alexander, W. North Carolina A&T State Univ Greensboro NC USA

ISBN: (纸本)0818620382

The main purpose of this work is to analyze and interpret the X-ray image by using some knowledge base that relates objects within a scene to one another and to the scene background. Knowledge-based image Analysis System (KIAS) is a prototype environment for image analysis and interpretation. KIAS consists of an image processing system and an expert system. It oversees image preprocessing, segmentation, feature extraction, knowledge representation, and object interpretation. An automatic segmentation algorithm is used to minimize a human inspector's intervention in the image processing system, and a rule-based approach is used in the expert system.

关键词： image processing

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