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ieee International symposium on Circuits and Systems (ISCAS)

作者： T. Lu S.S. Udpa L. Udpa Department of Electrical Engineering & Computer Engineering Iowa State University Iowa IA USA

A novel approach for implementing tomographic reconstruction algorithms using optoelectronic CCD (charge coupled device) structures is described. The approach employs the algebraic reconstruction technique (ART). The proposed method overcomes the problems of poor reconstruction results and implementation difficulties traditionally associated with ART. The optoelectronic approach described offers significant advantages over existing electronic methods both in terms of computational speed and quality of reconstruction.< >

关键词： Tomography image reconstruction Subspace constraints Computer architecture Reconstruction algorithms Charge coupled devices Optical signal processing Optical devices Pixel Equations

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COASTLINE DETECTION AND TRACING IN SAR imageS

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ieee TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 1990年第4期28卷 662-668页

作者： LEE, JS Center for Advanced Space Sensing Naval Research Laboratory Inc. Washington D.C. DC USA

images of coastlines generated by Synthetic Aperture Radars (SAR’s) suffer from a number of deficiencies which arise from the presence of the speckle effect and the strong signal return from a wind-roughened, wave-modulated sea. The frequent lack of contrast caused by these effects makes coastline detection difficult by most conventional procedures such as gray-level thresholding or segmentation by edge magnitude. This paper describes an algorithm for the global detection of coastlines based on a sequence of basic image-processing procedures and a new edge tracing algorithm. The application of the proposed procedure to Seasat SAR and SIR-B (Shuttle imaging Radar B) images demonstrates that with only a modest computational burden it produces a good visual match between the detected coastline and the coastline of original image. Additionally, the separation of land from water achieved by this algorithm permits clean pseudocoloring of coastal area images. © 1990 ieee

关键词： Speckle Filters image edge detection Noise level Sea measurements Impedance Humans Government Protection Histograms

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A Comparison Of Legendre and Walsh Moments

A Comparison Of Legendre and Walsh Moments

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Southern African Conference on Communications and signal processing (COMSIG)

作者： A.L. Nel Laboratory for Cybernetics Rand Afrikaans University

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DSP architectural features for intelligence and control applications

DSP architectural features for intelligence and control appl...

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ieee International symposium on Intelligent Control (ISIC)

作者： I. Radivojevic J. Herath ECE Department Drexel University Philadelphia PA USA

The architectural features of digital signal processors (DSPs) that make them applicable to intelligent control are discussed. The impact of on-chip parallel features on numeric processing capabilities and efficient program execution is described. I/O and real-time features of DSPs are examined. The role of numerical computations in preprocessing vocal, visual and written input data in real-time AI systems is considered. The parallels between neural and DSP computations are illustrated. A node configuration for a virtually implemented neural network, based on a commercially available DSP chip, is proposed.< >

关键词： Digital signal processing Intelligent control Digital signal processing chips Hardware Arithmetic Filtering computational intelligence Digital signal processors Parallel processing Instruction sets

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Efficient 2-D analysis/synthesis filter banks for directional image component representation

Efficient 2-D analysis/synthesis filter banks for directiona...

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ieee International symposium on Circuits and Systems (ISCAS)

作者： R.H. Bamberger M.J.T. Smith Digital Signal Processing Laboratory School of Electrical Engineering Georgia Institute of Technology Atlanta GA USA

A filter bank for the directional decomposition of images is described. The filter bank represents a union of two powerful image processing tools: directional decomposition and subband decomposition. The directional components correspond to wedge-shaped regions in the frequency spectrum. The filter bank is implemented in a tree structure where each two-band system is maximally decimated and provides either exact or aliasing free reconstruction. The design of the analysis/synthesis filter is such that the filter bank can be implemented in an extremely efficient computational form. The design method described uses conventional 1-D analysis/synthesis filters as prototypes and thereby circumvents designing 2-D filters.< >

关键词： image analysis Channel bank filters Filter bank signal synthesis signal analysis image processing Frequency image reconstruction Design methodology signal design

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Analog signal processing using cellular neural networks

Analog signal processing using cellular neural networks

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ieee International symposium on Circuits and Systems (ISCAS)

作者： K.R. Krieg L.O. Chua L. Yang Department of Electrical Engineering and Computer Sciences University of California Berkeley CA USA

The cellular neural network (CNN) is an example of very-large-scale analog processing or collective analog computation. The CNN architecture combines some features of fully connected analog neural networks with the nearest-neighbor interactions found in cellular automata. These networks have numerous advantages both for simulation and for VLSI implementation and can perform (though are not limited to) several important image processing functions. The important features which enable the CNN architecture to perform signal processing functions using standard VLSI technology are discussed. Circuit characteristics are outlined, and examples of cellular neural network signal processing are presented. Connected segment extraction is illustrated by examples, as is histogramming using a two-layer CNN.< >

关键词： signal processing Cellular neural networks Very large scale integration Analog computers Computer networks Computer architecture Neural networks computational modeling Circuit simulation image processing

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Time-frequency estimation from either signal domain-implementation on a RISC system

Time-frequency estimation from either signal domain-implemen...

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ieee International symposium on Circuits and Systems (ISCAS)

作者： D.O. Adams J. Wilbur Power Network Scrvices NCR Corporation West Columbia USA Signal and Image Processing Branch Naval Coastal Systems Center Panama FL USA

A Wigner-distribution-based spectral estimation is optimized for high-level-language implementation on a reduced-instruction-set-computer (RISC) architecture. Traditionally, time-frequency estimators have relied on time histories for the input. The implementation presented allows for equivalent transformation to the t-w plane given either time or frequency input data. The estimator employs a generalized form of the WD and is developed at the algorithm level to offer both flexibility and computational efficiency. Several DFT alternatives including the radix-2 FFT, radix-4 FFT, SRFFT, WFTA, and PFA are investigated in terms of relative computational delays versus a floating-point addition-time-to-multiply-time ratio.< >

关键词： Time frequency analysis Reduced instruction set computing Clocks Smoothing methods High level languages History signal processing algorithms Discrete Fourier transforms signal processing Workstations

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Iterative image enhancement algorithms for multi-layer specimens in scanning tomographic acoustic microscopy

Iterative image enhancement algorithms for multi-layer speci...

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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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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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