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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： B. Mirzai H.C. Reddy G.S. Moschytz Signal and Information Processing Laboratory Swiss Federal Institute of Technology Zurich Switzerland Department of Electrical and Computer Engineering University of California Irvine CA USA Department of Electrical Engineering California State University Long Beach CA USA

The delta operator approach to continuous-time cellular neural networks (CT-CNNs) is investigated in terms of a robust realization. It is shown that earlier results concerning the robustness of CT-CNNs can be obtained as a limiting case of this approach, while at the same time, this allows us to formulate robustness considerations for discrete-time CNNs.

关键词： Robustness Cellular neural networks Sampling methods Signal processing Limiting Nonlinear equations Information processing Laboratories computer networks Image processing

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Model-based detection and correction of corrupted wavelet coefficients

Model-based detection and correction of corrupted wavelet co...

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IEEE International Conference on Image processing

作者： N. Strobel S.K. Mitra B.S. Manjunath Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara USA University of California Santa Barbara Santa Barbara CA US

Image decomposition based on the discrete wavelet transform (DWT) has been proposed for efficient storage and progressive transmission of images for visual browsing in digital image libraries. Although the compression aspects of the DWT have been carefully researched, reconstruction errors due to corrupted wavelet coefficients have received less attention. In this paper we consider the problem of bit errors affecting uniformly quantized wavelet coefficients. The proposed method, which is based on a local image model, simultaneously detects and masks corrupted wavelet coefficients.

关键词： Wavelet coefficients Image coding Image reconstruction Discrete wavelet transforms Filters Decoding Error correction Image edge detection Signal processing Image processing

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The contrast pyramid based image code

The contrast pyramid based image code

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IEEE International Conference on Image processing

作者： Tian-Hu Yu Jianhua Chen S.K. Mitra Department of Information Engineering Chinese University of Hong Kong New Territories Hong Kong China Department of Electrical and Computer Engineering Signal and Image Processing Laboratory University of California Santa Barbara CA USA

In this paper, a contrast pyramid based image coding method is described in which a simple nonlinear difference operation is introduced to generate residual information between two contiguous level images. The representation of the residual information can be considered as a local contrast measure. As the difference image in established pyramid coding techniques, the contrast image has low variance, and data compression is achieved by quantizing the contrast image. Based on Weber's law and spatial masking of the human visual system, further data compression can be attained by selecting only perceptually significant information from the contrast image and coding it efficiently.

关键词： Image coding Laplace equations Low pass filters Data compression Humans Data structures Nonlinear filters Filtering Image generation Visual system

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Three-dimensional analytical and numerical solutions for acousto-optic interaction

Three-dimensional analytical and numerical solutions for aco...

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Southeastern Symposium on System Theory

作者： D.B. Dunn M. McNeill Jiangang Xia Ting-Chung Poon P.P. Banerjee Optical Image Processing Laboratory The Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University VA USA Department of Elec. Engineering Bucknell University USA York University Canada Center for Applied Optics Department of Electrical and Computer Engineering University of Alabama Huntsville Huntsville AL USA

The authors present an analytical solution to the strong acousto-optic interaction problem in three dimensions. They then compare the analytical results to a split-step numerical algorithm. The algorithm is based on t... 详细信息

关键词： Optical propagation Acoustic beams Transfer functions Diffraction Acoustic propagation USA Councils Gratings Image analysis Image processing Laboratories

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Real-time image processing using cascaded acousto-optic modulators

Real-time image processing using cascaded acousto-optic modu...

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IEEE Southeastcon

作者： D.B. Dunn Jiangang Xia Ting-Chung Poon P.P. Banerjee Optical Image Processing Laboratory The Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University VA USA Virginia Polytechnic Institute and State University Blacksburg VA US Center for Applied Optics Department of Electrical and Computer Engineering University of Alabama Huntsville Huntsville AL USA

We present a novel and simple cascaded acousto-optic image processing system to perform image processing. The system consists of two imaging lenses and two acousto-optic modulators that are placed in series. Real time image processing is achieved by Bragg diffraction. computer simulation is given and compared to an optical image processing system which uses a single acousto-optic modulator.

关键词： Image processing Optical imaging Lenses Optical modulation Fourier transforms Transfer functions Equations Laboratories computer simulation Acoustic beams

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Performance enhancement in acousto-optic image processing

Performance enhancement in acousto-optic image processing

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IEEE Southeastcon

作者： P.P. Banejee D. Cao T.-C. Poon Dept. of Electr. & Comput. Eng. Alabama Univ. Huntsville AL USA Department of Electrical and Computer Engineering University of Alabama Huntsville Huntsville AL USA Optical Image Processing Laboratory The Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

From the transfer functions of an acousto-optic (AO) cell, it is found that some basic image processing can be accomplished by using AO cells. Instead of frequency-plane filters, the AO cells are placed directly behind the object. The one dimensional edge enhancement results using one AO cell can be improved by using two acousto-optic cells which are put in tandem and with contra-propagating sound. The dominant second derivative operation obtained from the transfer function of the undiffracted order works like a one-dimensional Laplacian operator which enables improved edge enhancement.

关键词： Image processing Numerical simulation Digital images Image edge detection Propagation delay Laplace equations

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A simulator construction methodology for the Shiva multiprocessor system

A simulator construction methodology for the Shiva multiproc...

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IEEE International Conference on Algorithms and Architectures for parallel processing (ICAP)

作者： S. Slomka K.F. Sterzl V. Lakshmi Narasimhan The Speech Research Laboratory Signal Processing Research Center Queensland University of Technology Brisbane QLD Australia The PA SE Research Laboratory Department of Electrical and Computer Engineering University of Queensland Saint Lucia QLD Australia Information Management Group ITD DSTO Salisbury SA Australia

This paper describes a simulator for the Shiva multiprocessor system and the simulator construction methodology (SCM) used in its creation. The SCM, based on the active functional unit (AFU) construct, is a modern SCM which is flexible, accurate, fast, easy to use, capable of dynamic reconfigurability at run-time, and most of all simple and capable of quick simulator construction. The AFU SCM is capable of all these things through the use of object-oriented software techniques. The Shiva simulator constructed using the AFU SCM is program-driven and capable of micro and macro architectural simulation.

关键词： Multiprocessing systems Computational modeling Object oriented modeling Signal generators Laboratories computer simulation Discrete event simulation Speech processing Signal processing Information management

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Joint motion/disparity MAP estimation for stereo image sequences

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IEE PROCEEDINGS-VISION IMAGE AND SIGNAL processing 1996年第2期143卷 101-108页

作者： Malassiotis, S Strintzis, MG Department of Electrical & Computer Engineering Information Processing Laboratory University of Thessaloniki Greece

An algorithm is described for the joint estimation of motion and disparity vector fields from stereoscopic image sequences. Markov random fields (MRF) are used to model local interaction processes. Interaction of neighbouring-motion disparity vectors across a discontinuity line is prohibited via hidden Markov fields signalling discontinuities in the vector fields. Occlusion processes are also used to mark occluded image locations, which may yield ambiguous matches. The coherence of motion and disparity vector fields is exploited by means of the epipolar constraint and the so called 'loop constraint'. A computationally efficient, suboptimal, hierarchical, deterministic relaxation algorithm is proposed.

关键词： algorithms signal processing imaging optimisation

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Plasma immersion ion implantation with dielectric substrates

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IEEE TRANSACTIONS ON PLASMA SCIENCE 1996年第6期24卷 1383-1388页

作者： Linder, BP Cheung, NW Plasma Assisted Materials Processing Laboratory Department of Electrical Engineering and Computer Science University of California Berkeley CA USA

Plasma immersion ion implantation (Pm) is a novel implantation technique for high-dose/high-current implants. Using the SPICE circuit simulator to model the PIII process, the sheath voltage and ion energy distribution are examined. Implanting into a dielectric substrate results in a significant voltage buildup in the wafer, reducing the effective implant energy. Increasing the pulse voltage raises the dose/pulse, but at the cost of an expanded implant energy spread. Increasing the plasma ion density also raises the dose/pulse, but at the cost of a wider implant energy spread and a lower coupling efficiency. Increasing the substrate thickness reduces both the coupling efficiency and dose/pulse while broadening the energy spread. The large voltage generated across the dielectric substrate decreases the charge neutralization time significantly, reducing the possibility of gate oxide damage.

关键词： Plasma immersion ion implantation gate oxide Implants and Prostheses circuit simulator Dielectric substrates Shock voltage Ion energy distribution ion densities

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A new method for determining the secondary electron yield dependence on ion energy for plasma exposed surfaces

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IEEE TRANSACTIONS ON PLASMA SCIENCE 1996年第3期24卷 1184-1187页

作者： En, W Cheung, NW Assisted Materials Processing Laboratory Department of Electrical Engineering and Computer Sciences University of California Berkeley CA USA

A new experimental method for determining the secondary electron yield for plasma exposed surfaces is described. From the measurement of the plasma condition and the total current generated when a voltage pulse is applied to a target material exposed to a plasma, the dependence of the secondary electron yield of that target on ion energy can be extracted. The secondary electron yield Is determined by an analytical model of the plasma ion, electron, and displacement currents. Experimental results for an aluminum target correlate well with previous secondary electron measurements which used a traditional technique, Secondary electrons yield data of other materials: single crystal silicon, aluminum, titanium nitride, and silicon dioxide are also extracted.

关键词： Electrons Plasma measurements Plasma materials processing Pulse measurements Data mining Aluminum Current measurement Energy measurement Pulse generation Voltage

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