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ieee symposium (IUS) Ultrasonics

作者： B.L. Douglas H. Lee Center for Information Processing Research Department of Electrical and Computer Engineering University of California Santa Barbara USA University of Illinois Urbana USA

A performance evaluation of three iterative enhancement techniques is presented. The reconstruction obtained with the backward propagation algorithm is used as the initial estimate for these recursive procedures. The results indicate that the estimates can be improved consistently by using Newton's method, the conjugate gradient method, or pixel-by-pixel optimization. In addition to simulated data, experimental data samples have been applied to this analysis to demonstrate the capability, effectiveness, and convergence properties of these techniques. In the computer simulations at low signal-to-noise ratios (SNRs), the conjugate gradient method was the best, and at high SNRs Newton's method was superior.< >

关键词： image enhancement Iterative algorithms Newton method Gradient methods image reconstruction Recursive estimation Optimization methods computational modeling Analytical models Convergence

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Ultrasonic feature based imaging for post-factum control

Ultrasonic feature based imaging for post-factum control

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ieee International symposium on Intelligent Control (ISIC)

作者： J.L. Rose K. Balasubramaniam G. Chen Department of Mechanical Engineering & Mechanics Drexel University Philadelphia PA USA

This work focuses on the ultrasonic feature-mapping technique for post-factum control. Feature-based analysis and material state imaging constitute a powerful technique, applying both physically and statistically based principles. The technique integrates many data collection procedures, such as critical angles, surface waves, plate waves, and backscattering techniques, into an extremely versatile data acquisition protocol and entails detailed analysis through state-of-the-technology signal processing, pattern recognition, and system and/or artificial intelligence implementation practice. The various existing possibilities for physically based data collection and the types of feature domains and features available for anomaly representation in materials are discussed. Possible applications of feature-based imaging in a manufacturing environment through post factum quality control are considered.< >

关键词： Ultrasonic imaging image analysis Surface waves Backscatter Data acquisition Protocols Pattern analysis signal analysis signal processing Pattern recognition

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A BAYESIAN-APPROACH TO RECONSTRUCTION FROM INCOMPLETE PROJECTIONS OF A MULTIPLE OBJECT 3D DOMAIN

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ieee TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE intelligence 1989年第8期11卷 840-858页

作者： BRESLER, Y FESSLER, JA MACOVSKI, A STANFORD UNIV DEPT ELECT ENGNINFORMAT SYST LABSTANFORDCA 94305 UNIV ILLINOIS COORDINATED SCI LABURBANAIL 61821

An estimation approach is described for three-dimensional reconstruction from line integral projections using incomplete and very noisy data. Generalized cylinders parameterized by stochastic dynamic models are used to represent prior knowledge about the properties of objects of interest in the probed domain. The object models, a statistical measurement model, and the maximum a posteriori probability performance criterion are combined to reformulate the reconstruction problem as a computationally challenging nonlinear estimation problem. For computational feasibility, a suboptimal hierarchical algorithm is described whose individual steps are locally optimal and are combined to satisfy a global optimality criterion. The formulation and algorithm are restricted to objects whose center axis is a single-valued function of a fixed spatial coordinate. Simulation examples demonstrate accurate reconstructions with as few as four views in a 135 degrees sector, at an average signal-to-noise ratio of 3.3.","doi":"10.1109/34.31446","publicationTitle":"ieee Transactions on Pattern Analysis and Machine intelligence","startPage":"840","endPage":"858","rightsLink":"http://***/AppDispatchServlet?publisherName=ieee&publication=0162-8828&title=A+Bayesian+approach+to+reconstruction+from+incomplete+projections+of+a+multiple+object+3D+domain&isbn=&publicationDate=Aug.+1989&author=Y.+Bresler&ContentID=10.1109/34.31446&orderBeanReset=true&startPage=840&endPage=858&volumeNum=11&issueNum=8","displayPublicationTitle":"ieee Transactions on Pattern Analysis and Machine intelligence","pdfPath":"/iel1/34/1358/***","keywords":[{"type":"ieee Keywords","kwd":["Bayesian methods","image reconstruction","Stochastic processes","Computed tomography","Data acquisition","Application software","Biomedical imaging","Acoustic noise","computational modeling","signal to noise ratio"]},{"type":"INSPEC: Controlled Indexing","kwd":["stochastic processes","Bayes methods","optimisation","pat

关键词： Bayesian methods image reconstruction Stochastic processes Computed tomography Data acquisition Application software Biomedical imaging Acoustic noise computational modeling signal to noise ratio INSPEC: Controlled Indexing stochastic processes Bayes methods optimisation pattern recognition picture processing probability INSPEC: Non-Controlled Indexing single-valued function 3D object reconstruction picture processing pattern recognition incomplete projections line integral projections stochastic dynamic models object models statistical measurement model probability global optimality

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Parallel processor scheduling for digital signal processing

Parallel processor scheduling for digital signal processing

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ieee International symposium on Circuits and Systems (ISCAS)

作者： H. Kunieda S. Toyoshima Faculty of Engineering Tokyo Institute of Technology Japan

The authors study a method for deriving MIMD (multiple-instruction-stream, multiple-data-stream) multiprocessor scheduling with the shortest sampling duration, including processor communication time, for general signal processing algorithms. The method makes use of the repetitive nature of digital signal processing, which reduces the computational complexity of searching for the optimal assignment of operations to processors. The examples show that the proposed algorithm obtains the nearly optimum solution in most cases and works very efficiently.< >

关键词： Processor scheduling Digital signal processing signal processing algorithms signal sampling Delay Parallel processing signal processing computational complexity image processing Communication networks

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Radon transform computations using DSP chips: an evaluation and comparison

Radon transform computations using DSP chips: an evaluation ...

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ieee International symposium on Circuits and Systems (ISCAS)

作者： E. Shieh W. Current P. Hurst I. Agi Electrical Engineering and Computer Science Department University of California Davis CA USA

A description is given and a comparison is made of different interpolation schemes for the computation of the Radon transform and backprojections. The nearest neighbor method is fastest, but the resulting reconstructed image is not very good. For D=1 the best method to use is linear interpolation because its performance is virtually identical to the line-length method at a reduced computational complexity. If D>1, the best reconstruction is obtained using the line-length method. The authors compared implementations of these procedures on two DSP chips. Although the DSP 16 clock cycle time is only 55 ns, which is 3.6 times faster than the TMS32020 200-ns clock cycle time, it performs backprojection computations only about 1.8 times faster than the slower TMS32020 chip. The 60-ns cycle-time TMS320C30 is capable of performing the Radon and inverse transforms faster than the 55-ns DSP16, due to the differences in instruction sets and architectures of the chips.< >

关键词： Digital signal processing chips Interpolation image reconstruction computational modeling Pixel Optical filters Laser radar Pipelines Gold Filtering

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PROCEEDINGS - THE TWENTIETH SOUTHEASTERN symposium ON SYSTEM THEORY.

PROCEEDINGS - THE TWENTIETH SOUTHEASTERN SYMPOSIUM ON SYSTEM...

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Proceedings - The Twentieth Southeastern symposium on System Theory.

作者： Anon

ISBN: (纸本)0818608471

The proceedings contains 132 papers. The following topics are dealt with: time varying/nonlinear systems;power systems;computer-aided design;artificial intelligence;communications;computer networking;linear systems;image processing;optical systems and technology;power system stability;application of personal computers;control theory;speech processing/synthesis;signal processing;robotics;simulation and modeling;expert systems;adaptive control systems;VLSI;testing and software engineering;aerospace and other applications;and radar systems. Abstracts of individual papers can be found under the relevant classification codes in this or other uses.

关键词： SYSTEMS SCIENCE AND CYBERNETICS

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Toward structural adaptivity

Toward structural adaptivity

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ieee International symposium on Circuits and Systems (ISCAS)

作者： J. Sztipanovits Vanderbilt University Nashville TN USA

The concept of structural adaptivity is analyzed and the problems and methods of implementation are discussed. It is shown that the application of dynamic, graph computation models and various artificial-intelligence programming techniques, particularly declarative programming, can lead to the practical implementation of this novel system category.< >

关键词： Adaptive systems signal processing algorithms Algorithm design and analysis Synthetic aperture sonar Dynamic programming Artificial intelligence Process control signal design Robots computational modeling

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Impact Of Phase And Amplitude Errors On The ERS-1 Active Microwave Instrumentation Performance

Impact Of Phase And Amplitude Errors On The ERS-1 Active Mic...

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ieee International symposium on Geoscience and Remote Sensing (IGARSS)

作者： B.E. Richards G.A. Whitehurst M.A. Brown Marconi Space Systems Limited Portsmouth UK GEC-Marconi Hirst Research Centre Chelmsford UK

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A PARALLEL ARCHITECTURE FOR DISCRETE RELAXATION ALGORITHM

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ieee TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE intelligence 1987年第6期9卷 816-831页

作者： GU, J WANG, W HENDERSON, TC UNIV UTAH DEPT ELECT ENGNSALT LAKE CITYUT 84112

Discrete relaxation techniques have proven useful in solving a wide range of problems in digital signal and digital image processing, artificial intelligence, operations research, and machine vision. Much work has been devoted to finding efficient hardware architectures. This paper shows that a conventional hardware design for a Discrete Relaxation Algorithm (DRA) suffers from O(n2m3) time complexity and O(n2m2) space complexity. By reformulating DRA into a parallel computational tree and using a multiple tree-root pipelining scheme, time complexity is reduced to O(nm), while the space complexity is reduced by a factor of 2. For certain relaxation processing, the space complexity can even be decreased to O(nm). Furthermore, a technique for dynamic configuring an architectural wavefront is used which leads to an O(n) time highly concurrent DRA3 architecture.","doi":"10.1109/TPAMI.1987.4767988","publicationTitle":"ieee Transactions on Pattern Analysis and Machine intelligence","startPage":"816","endPage":"831","rightsLink":"http://***/AppDispatchServlet?publisherName=ieee&publication=0162-8828&title=A+Parallel+Architecture+for+Discrete+Relaxation+Algorithm&isbn=&publicationDate=Nov.+1987&author=Jun+Gu&ContentID=10.1109/TPAMI.1987.4767988&orderBeanReset=true&startPage=816&endPage=831&volumeNum=PAMI-9&issueNum=6","displayPublicationTitle":"ieee Transactions on Pattern Analysis and Machine intelligence","pdfPath":"/iel5/34/4767975/***","keywords":[{"type":"ieee Keywords","kwd":["Parallel architectures","Hardware","signal processing","Digital images","Artificial intelligence","Operations research","Machine vision","Computer architecture","Algorithm design and analysis","Concurrent computing"]},{"type":"Author Keywords ","kwd":["VLSI","Algorithm-configured dynamic architectural wave-front system","associative circular pipelining","Discrete Relaxation Algorithm (DRA)","interleaved processing","multiprocessor architecture","recursive systolic computat

关键词： Parallel architectures Hardware signal processing Digital images Artificial intelligence Operations research Machine vision Computer architecture Algorithm design and analysis Concurrent computing Author Keywords VLSI Algorithm-configured dynamic architectural wave-front system associative circular pipelining Discrete Relaxation Algorithm (DRA) interleaved processing multiprocessor architecture recursive systolic computation

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PROCEEDINGS - INTERNATIONAL WORKSHOP ON INDUSTRIAL APPLICATIONS OF MACHINE VISION AND MACHINE intelligence, SEIKEN symposium.

PROCEEDINGS - INTERNATIONAL WORKSHOP ON INDUSTRIAL APPLICATI...

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Proceedings - International Workshop on Industrial Applications of Machine Vision and Machine intelligence, Seiken symposium

作者： Anon

The following topics are dealt with: automated inspection;robots;CAD;database systems;mobile robots;3-D sensors;pattern data capture;stereo vision;image processing technology;object recognition;motion analysis;expert ... 详细信息

关键词： VISION

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