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检索条件"主题词=Algorithm Development"

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ADAPTING FDDI TO GIGABIT TRANSMISSION RATES

ADAPTING FDDI TO GIGABIT TRANSMISSION RATES

引用

2ND CONF ON HIGH-SPEED FIBER NETWORKS AND CHANNELS

作者： DOBOSIEWICZ, W GBURZYNSKI, P Univ. of Alberta (Canada)

ISBN: (纸本)0819409634

The FDDI ring-protocol combination is well-suited for large local (`campus') area networks. However, for larger networks, FDDI users suffer excessive access delay, even under very light traffic. Moreover, FDDI achieves full capacity only in special circumstances, and heavy load is not a sufficient condition for achieving it. We propose a modification of FDDI that has none of these deficiencies. By changing the interpretation of holding the token, we get a protocol that allows every station to transmit when the link is silent. The resulting token-passing protocol yields a capacity-1 network even for modest values of TTRT. Additionally, stations endure a very small access delay under light load. All the other properties are identical to those of FDDI. The proposed protocol uses standard FDDI components. Moreover, the protocol is compatible with FDDI to the point that it works correctly even if some of the stations attached to it operate under the original FDDI protocol (those stations will get the performance offered by FDDI, while the stations using the new protocol will get a larger bandwidth and a lesser access delay).

关键词： Local area networks Receivers Information operations Failure analysis algorithm development Clocks Palladium Solar concentrators Transmitters Visualization

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WAVELET-BASED SENSOR FUSION 6

WAVELET-BASED SENSOR FUSION

引用

CONF ON SENSOR FUSION 6

作者： HUNTSBERGER, T JAWERTH, B Univ. of South Carolina (United States)

ISBN: (纸本)0819413240

Sensor fusion can be performed either on the raw sensor output or after a segmentation step has been done. Our previous work has concentrated on neural network models for sensor fusion after segmentation. Although this method has been shown to be fast and reliable, there is still the overhead entailed from using entire images. The wavelet transform is a multiresolution method that is used to decompose images into detail and average channels. These channels maintain all of the image information and sensor fusion logic operations can be done within the wavelet coefficient space. In addition, image compression can be done within this same space for possible remote transmission. This paper examines sensor fusion within the wavelet coefficient space. The results of some experimental studies performed on the 1024 node NCUBE/10 at the University of South Carolina are also included.

关键词： Wavelets Image fusion Image segmentation Sensor fusion Image compression Wavelet transforms algorithm development Image processing algorithms and systems Logic Sensors

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NEXT-STATE FUNCTIONS FOR FINITE-STATE VECTOR QUANTIZATION

NEXT-STATE FUNCTIONS FOR FINITE-STATE VECTOR QUANTIZATION

引用

Meeting on Visual Communications and Image Communication 93

作者： NASRABADI, NM MOHSENIAN, N MAK, HT RIZVI, SA SUNY BUFFALO DEPT ELECT & COMP ENGNBUFFALONY 14260

ISBN: (纸本)0819413690

In this paper, a finite-state vector quantizer called Dynamic Finite-State Vector Quantization (DFSVQ) is investigated with regard to its subcodebook construction. In DFSVQ each input vector encoded by a small codebook, called subcodebook, is created from a much larger codebook called supercodebook. The subcodebook is constructed by selecting (reordering procedure) a set of appropriate codevectors from the supercodebook. The performance of the DFSVQ depends on this reordering procedure, therefore, several reordering procedures are introduced and their performances are evaluated in this paper. The reordering procedures that are investigated are the conditional histogram, address prediction, vector prediction, nearest neighbor design, and the frequency usage of codevectors. The performance of the reordering procedures are evaluated by comparing their hit ratios (the number of blocks encoded by the subcodebook) and their computational complexity. Experimental results are presented for both still images and video. It is found that for still images the conditional histogram performs the best and for video the nearest neighbor design performs the best.

关键词： Computer programming Neural networks Quantization Receivers Distortion Video Matrices Motion detection Transmitters algorithm development

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ADAPTATION OF GRAYSCALE MORPHOLOGICAL FILTERS 4

ADAPTATION OF GRAYSCALE MORPHOLOGICAL FILTERS

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4TH CONF ON NONLINEAR IMAGE PROCESSING

作者： WANG, QF NEUVO, Y Tampere Univ. of Technology (Finland)

ISBN: (纸本)0819411353

Grayscale morphology has been widely used in image processing, especially in noise removal. In this paper, we find an optimal solution for designing a grayscale morphological filter. An adaptive algorithm is developed for determining, from a given class of grayscale morphological filters, a filter which minimizes the mean square error between its output and a desired process. The adaptation using the conventional least mean square algorithm optimizes the grayscale structuring element in a given search area. The performance of noise removal is compared to another class of nonlinear filters, i.e., adaptive and nonadaptive stack-based filters.

关键词： Digital filtering Image filtering Filtering (signal processing) Nonlinear filtering algorithm development Selenium Image processing Nonlinear image processing Signal processing Electronic filtering

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VECTOR AERIAL IMAGE WITH OFF-AXIS ILLUMINATION

VECTOR AERIAL IMAGE WITH OFF-AXIS ILLUMINATION

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CONF ON OPTICAL/LASER MICROLITHOGRAPHY

作者： BAROUCH, E COLE, DC HOLLERBACH, U ORSZAG, SA Princeton Univ. (United States) IBM Corp. (United States)

ISBN: (纸本)0819411612

As the numerical aperture (NA) in optical projection systems increases, the vector nature of the projected electric and magnetic fields becomes more important. Recent advances in off- axis illumination, tilting condenser lenses, and applying spatial filters, as well as phase-shift masks, hold the potential of increased depth of focus. To simulate these techniques in the high- NA regime, we have developed new fast algorithms. The development reported here builds on our recent work (1) extending scalar aerial imaging. The systematic treatment of (1) has now been applied to account for the vector nature of light.

关键词： Photomasks Computer aided design Fiber optic illuminators Fourier transforms Optical lithography Metals Image segmentation Projection systems algorithm development Lenses

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SYSTEMATIC-ERROR ESTIMATION IN MULTISENSOR FUSION SYSTEMS

SYSTEMATIC-ERROR ESTIMATION IN MULTISENSOR FUSION SYSTEMS

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5TH CONF ON SIGNAL AND DATA PROCESSING OF SMALL TARGETS

作者： VANDOORN, BA BLOM, HAP National Aerospace Lab. NLR (Netherlands)

ISBN: (纸本)0819411906

For multisensor fusion systems it is a prerequisite to accurately estimate and correct all systematic errors. Adequate estimation methods only exist if all systematic errors are constant random variables, while in practice they may change with time. When the object states, the systematic errors and the observations vary according to a linear Gaussian system, then one large Kalman filter forms the optimal estimator for the combined state of all object states and all systematic errors. In general the numerical complexity of this Kalman filter prohibits practical application. In order to improve this situation we decouple the large Kalman filter into a number of separate filters: for each object one track maintenance Kalman filter, and for the estimation of all sensor related systematic errors one Kalman-like filter, which we call the Macro filter. The effectiveness of this approach is illustrated through simulations for a simple example.

关键词： Filtering (signal processing) Sensors Error analysis Electronic filtering Monte Carlo methods Systems modeling Matrices Radon algorithm development Barium

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ADVANCED TRANSFORMATIONAL ANALYSIS APPLIED TO E-BEAM PROXIMITY EFFECT CORRECTION 3

ADVANCED TRANSFORMATIONAL ANALYSIS APPLIED TO E-BEAM PROXIMI...

引用

CONF ON ELECTRON-BEAM, X-RAY, AND ION-BEAM SUBMICROMETER LITHOGRAPHIES FOR MANUFACTURING 3

作者： BAROUCH, E COIFMAN, R MA, J PECKERAR, MC ROKHLIN, V Princeton Univ. (United States) Yale Univ. (United States) Naval Research Lab. (United States)

ISBN: (纸本)0819411582

In this paper we address the problem of dose correction in the data bases consistent with ultra- large-scale integration. It is shown that recent advances in transformation theory provide a natural platform on which to build these dose correctors. Specifically, transformation approaches making use of compactly supported, smooth basis functions are shown to be particularly suitable. This is a natural result of the evolution of mathematically based correctors currently in use. Previous work in Parikh, MacDonald and others employed global transform method to determine the values of 'corrected' dose. In most cases, the mathematical inversion is essentially ill posed, in other words, the exact pattern desired cannot be obtained using a finite Gaussian sum. In this paper a set of smooth basis elements of compact support are employed. The mathematically smooth form of the basis makes it easy to match doses at boundaries without Gibbs phenomenon. Thus the transform field can be partitioned for optimum speed. Consequently, while most transformation complexities are of order N⁶ (the inversion of an N² X N² matrix) where N² is the number of grid points characterizing the database, we developed an algorithm of complexity N² log N. A method of dose field bias is employed to stem the requests for negative dose. The heart of the numerical process is essentially based on an adapted fast non-uniform-grid Fourier Transform combined with proper filtering and geometric localization methods. Several examples are given.

关键词： Photomasks Scattering algorithm development Microchannel plates Data corrections Photoresist processing Picosecond phenomena Point spread functions Electron beam lithography Fourier transforms

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ROBUST SURFACE PERCEPTION IN RANGE DATA 6

ROBUST SURFACE PERCEPTION IN RANGE DATA

引用

CONF ON SENSOR FUSION 6

作者： BOYER, KL MIRZA, MJ The Ohio State Univ. (United States) The Ohio State Univ. (Pakistan)

ISBN: (纸本)0819413240

We present an autonomous, statistically robust, sequential function approximation approach to simultaneous parameterization and organization of (possibly partially occluded) surfaces in noisy, outlier-ridden (not Gaussian) range data. Unlike existing surface characterization techniques, our method generates complete surface hypotheses in parameter space. Given a noisy depth map of an unknown 3D scene, the algorithm first selects appropriate seed points representing possible surfaces. For each non-redundant seed it chooses the best approximating model from a given set of competing models using the Modified Akaike Information Criterion (MCAIC). With this best model, each surface is expanded from its seed over the entire image, and this step is repeated for all seeds. Those points which appear to be outliers with respect to the model in growth are not included in the (possibly disconnected) surface. Point regions are removed from each newly grown surface in the prune stage. Noise, outliers, or coincidental surface alignment may cause some points to appear to belong to more than one surface. These ambiguities are resolved by a weighted voting scheme within a 5 X 5 decision window centered around the ambiguous point. The isolated point regions left after the resolve stage are removed and any missing points in the data are filled by the surface having a majority consensus in an 8-neighborhood.

关键词： Data modeling Error analysis Sensor fusion 3D modeling Natural surfaces Statistical modeling Image segmentation algorithm development Chemical elements Image fusion

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PRACTICAL OPTIMIZATION OF A SINGLE-CHANNEL OPTICAL PROCESSOR

PRACTICAL OPTIMIZATION OF A SINGLE-CHANNEL OPTICAL PROCESSOR

引用

INTERNATIONAL TOPICAL MEETING ON OPTICAL COMPUTING ( OC 92 )

作者： MCARDLE, N WADDIE, AJ SNOWDON, JF CRAIG, RGA WHERRETT, BS WALKER, AC Heriot-Watt Univ. (United Kingdom)

Recent construction of digital optical processors has highlighted the need for accurate control, measurement and modelling of system and device operating characteristics. Study of the single channel O-CLIP allows the ... 详细信息

ISBN: (纸本)0819410063

关键词： Clocks Tolerancing Switches Switching Optical computing Control systems Logic algorithm development Instrument modeling Singular optics

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DIMENSION MEASUREMENT BASED LASER DIFFRACTION

DIMENSION MEASUREMENT BASED LASER DIFFRACTION

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2nd International Symposium on Measurement Technology and Intelligent Instruments

作者： YILMAZ, M OZCALIK, HR ERCIYES UNIV FAC ENGNKAYSERI 38090TURKEY

ISBN: (纸本)0819413844

In this work by using all of the superior properties of laser hardware and software studies which will form a base for a new size measurement system have been realised and a proposal of project has been presented. The purpose of the work is the planning and forming the technology of a contactless system which allows 100 size and profile control of objects after production by using diod laser and CCD camera with shadow method and to form solutions for the problems faced as well.

关键词： Diffraction algorithm development CCD cameras Imaging systems Computing systems Beam expanders Beam splitters Charge-coupled devices Control systems Prototyping

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