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检索条件"主题词=Algorithm development"

共 1737 条记录，以下是1141-1150 订阅

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MAXIMUM-LIKELIHOOD METHOD FOR PROBABILISTIC MULTI-HYPOTHESIS TRACKING

MAXIMUM-LIKELIHOOD METHOD FOR PROBABILISTIC MULTI-HYPOTHESIS...

引用

Conference on Signal and Data Processing of Small Targets 1994

作者： STREIT, RL LUGINBUHL, TE USN CTR UNDERSEA WARFARE CTRDIV NEWPORTNEWPORTRI 02841

ISBN: (纸本)0819415391

In a multi-target multi-measurement environment, knowledge of the measurement-to-track assignments is typically unavailable to the tracking algorithm. In this paper, a strictly probabilistic approach to the measurement-to-track assignment problem is taken. Measurements are not assigned to tracks as in traditional multi-hypothesis tracking (MHT) algorithms; instead, the probability that each measurement belongs to each track is estimated using a maximum likelihood algorithm derived by the method of Expectation-Maximization. These measurement-to-track probability estimates are intrinsic to the multi-target tracker called the probabilistic multi-hypothesis tracking (PMHT) algorithm. Unlike MHT algorithms, the PMHT algorithm does not maintain explicit hypothesis lists. The PMHT algorithm is computationally practical because it requires neither enumeration of measurement-to-track assignments nor pruning.

关键词： Detection and tracking algorithms Silicon Expectation maximization algorithms algorithm development Error analysis Process modeling Filtering (signal processing) algorithms Environmental sensing Information operations

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RANK FILTERS WITH ADAPTIVE LENGTH 3

RANK FILTERS WITH ADAPTIVE LENGTH

引用

Conference on Visual Information Processing III

作者： KASPARIS, T MEMON, Q KOTEESWARAN, R UNIV CENT FLORIDA DEPT ELECT & COMP ENGNORLANDOFL 32816

ISBN: (纸本)081941543X

In this paper rank filters of adaptive length are presented. The filtering objective of these filters is the suppression of impulsive noise while preserving as much image detail as possible, and also high computational efficiency. In the proposed scheme the window size and shape are adaptively adjusted based on the amount of impulsive noise in an initial starting window. Using smaller windows increases the computational efficiency. To further improve the computational efficiency, median data blocks are used. The loss of image detail is prevented by an adaptive algorithm. Filtering examples demonstrating noise suppression, detail preservation, and computational efficiency are presented.

关键词： Digital filtering Image filtering Electronic filtering Visual information processing Detection and tracking algorithms Signal processing algorithm development Image processing Image quality Computer engineering

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VERSATILE STEREOSCOPIC LINE-SCAN IMAGING-SYSTEMS

VERSATILE STEREOSCOPIC LINE-SCAN IMAGING-SYSTEMS

引用

Conference on Image Acquisition and Scientific Imaging Systems

作者： GODBER, SX PETTY, R ROBINSON, M EVANS, P NOTTINGHAM TRENT UNIV DEPT ELECT & ELECTR ENGN3-D IMAGING & MACHINE VIS RES GRPNOTTINGHAM NG1 4BUENGLAND

ISBN: (纸本)0819414689

This paper describes continuing work with both 2-D and 3-D line-scan vision systems using rotation of both the camera and of an object to produce 2-D images. A rotating line-scan camera arrangement has been used to produce images of an area surrounding the camera stage. Due to the nature of the movement parameter these images can be arranged to cover a variable field of view in the movement axis, i.e.: from as small as 5 degree(s) up to 360 degree(s). This same arrangement has been used to produce images of a rotating object allowing a single 2-D image to contain information from the front, back and both sides of the object of interest. This 2-D system is to be extended into a full stereoscopic line-scan vision system. This will enable an investigation into extracting 3-D coordinate information from both the rotating camera and the rotating object.

关键词： Line scan image sensors Cameras Sensors Televisions Imaging systems 3D image processing Standards development CCD image sensors algorithm development Image resolution

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CHANNEL NORMALIZATION USING POLE-FILTERED CEPSTRAL MEAN SUBTRACTION

CHANNEL NORMALIZATION USING POLE-FILTERED CEPSTRAL MEAN SUBT...

引用

Conference on Automatic Systems for the Identification and Inspection of Humans

作者： NAIK, DK MAMMONE, RJ RUTGERS STATE UNIV CTR CAIPPISCATAWAYNJ 08855

ISBN: (纸本)0819416010

In this paper, we introduce a new methodology called Pole Filtering to remove the residual effects of speech from the cepstral mean channel estimate, for extracting features robust to transmission channel degradations. The approach is based on filtering the eigenmodes of speech that are more susceptible to convolutional distortions caused by transmission channels. Poles and their corresponding eigenmodes for a frame of speech are investigated when there is a channel mismatch for speaker identification systems. Linear Predictive (LP) cepstra of speech has been found to be a useful feature set for recognition systems. The relation between the LP cepstral coefficients and eigenmodes of speech has been exploited to develop a robust feature set. In this paper an algorithm based on Pole-filtering has been developed to improve the cepstral features for channel normalization. Experiments are presented in speaker identification using speech in the TIMIT database processed through a telephone channel simulator and on the San Diego portion of the KING database. The technique is shown to offer improved recognition accuracy under cross channel scenarios when compared to conventional methods.

关键词： Electronic filtering Databases Curium algorithm development Optical filters Digital filtering System identification Deconvolution Detection and tracking algorithms Speaker recognition

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MASSIVELY-PARALLEL algorithmS FOR REAL-TIME WAVE-FRONT CONTROL OF A DENSE ADAPTIVE OPTICS SYSTEM

MASSIVELY-PARALLEL ALGORITHMS FOR REAL-TIME WAVE-FRONT CONTR...

引用

Conference on Laser Power Beaming

作者： FIJANY, A MILMAN, M REDDING, D JET PROP LAB PASADENACA 91109

ISBN: (纸本)081941414X

Massively parallel algorithms and architectures for real-time wavefront control of a dense adaptive optic system (SELENE) are presented. We have already shown that the computation of a near optimal control algorithm for SELENE can be reduced to the solution of a discrete Poisson equation on a regular domain. Although this represents an optimal computation, due to the large size of the system and the high sampling rate requirement, the implementation of this control algorithm poses a computationally challenging problem since it demands a sustained computational throughput of the order of 10 GFlops. We develop a novel algorithm, designated as Fast Invariant Imbedding algorithm, which offers a massive degree of parallelism with simple communication and synchronization requirements. We also discuss two massively parallel, algorithmically specialized, architectures for low-cost and optimal implementation of the Fast Invariant Imbedding algorithm.

关键词： algorithm development Computer architecture Evolutionary algorithms Matrices Digital signal processing Adaptive optics Control systems Wavefronts Aluminum Computing systems

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COMPRESSION AND PROGRESSIVE TRANSMISSION OF ASTRONOMICAL IMAGES 5

COMPRESSION AND PROGRESSIVE TRANSMISSION OF ASTRONOMICAL IMA...

引用

Conference on Advanced Technology Optical Telescopes V

作者： WHITE, RL PERCIVAL, JW SPACE TELESCOPE SCI INST BALTIMOREMD 21218

ISBN: (纸本)0819414948

An image compression algorithm has ben developed that is well-suited to astronomical images. The method has 3 steps: an intensity mapping to generate an image that has roughly constant noise in each pixel, an orthonormal wavelet transform, and quadtree coding of the bit-planes of the wavelet coefficients. The quadtree values may be further compressed by an standard compression technique, such as Huffman or arithmetic coding. If the 2D Haar transform is used, the calculations can be carried out using integer arithmetic, and the method can be used for both lossy and lossless compression. The Haar transform basis functions are well-suited to most astronomical images because they are highly localized. The performance of the algorithm using smoother, longer range wavelets is also shown; they can give slightly better lossy compression at the cost of an increase in artifacts around point sources, but they are not effective for lossless compression using this scheme. This technique has also been used as the basis of a progressive image transmission system that can be used for either remote observing or access to remote image archives. After less than 1% of the data have been received, the image is visually similar to the original, so it is possible to assess the quality of images very quickly. If necessary, the entire compressed data set can be sent so that the original image is recovered exactly.

关键词： Image compression Astronomy Wavelets Wavelet transforms Image filtering algorithm development Visualization Digital filtering Image quality Space telescopes

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RESPONSE-TIME OPTIMIZATION OF RULE-BASED EXPERT-SYSTEMS

RESPONSE-TIME OPTIMIZATION OF RULE-BASED EXPERT-SYSTEMS

引用

Conference on Knowledge-Based Artificial Intelligence Systems in Aerospace and Industry

作者： ZUPAN, B CHENG, AMK UNIV HOUSTON DEPT COMP SCIHOUSTONTX 77204

ISBN: (纸本)0819415480

Real-time rule-based decision systems are embedded AI systems and must make critical decisions within stringent timing constraints. In the case where the response time of the rule- based system is not acceptable, it has to be optimized to meet both timing and integrity constraints. This paper describes a novel approach to reduce the response time of rule-based expert systems. Our optimization method is twofold: the first phase constructs the reduced cycle-free finite state transition system corresponding to the input rule-based system, and the second phase further refines the constructed transition system using the simulated annealing approach. The method makes use of rule-base system decomposition, concurrency, and state- equivalency. The new and optimized system is synthesized from the derived transition system. Compared with the original system, the synthesized system has fewer number of rule firings to reach the fixed point, is inherently stable, and has no redundant rules.

关键词： Rule based systems algorithm development Computing systems Embedded systems algorithms Optimization (mathematics) Evolutionary algorithms Sensors Real-time computing Aluminum

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GIGABIT OPTICAL INTERCONNECTS FOR LAN APPLICATIONS 2

GIGABIT OPTICAL INTERCONNECTS FOR LAN APPLICATIONS

引用

Conference on Photonics for Space Environments II

作者： BONCEK, RK KROL, MF JOHNS, ST STACY, JL HAYDUK, MJ PHOTON CTR ROME LABGRIFFISS AFBNY 13441

ISBN: (纸本)0819415197

We report on the results of experiments performed in areas of technology required to develop gigabit optical interconnects for communication at 1.3 micrometers wavelength. The goal of this work was to develop interconnects not only with very high bandwidth, but with serve to multiple channels having multiple access and simple processing algorithms so as not to rely on high bandwidth electronics, as well. Optical correlation switches (i.e. optical `AND' gates) for use in time-division optical interconnects achieve these goals.

关键词： Optical interconnects Modulators Receivers Clocks Electronics Photonics Switches algorithm development Local area networks Optical fibers

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FAST VARIATIONAL algorithm FOR CLUTTER REMOVAL THROUGH PYRAMIDAL DOMAIN DECOMPOSITION

FAST VARIATIONAL ALGORITHM FOR CLUTTER REMOVAL THROUGH PYRAM...

引用

Conference on Chaos/Nonlinear Dynamics: Methods and Commercialization

作者： RUDIN, L KOEPFLER, G NORDBY, F MOREL, JM COGNITECH INC SANTA MONICACA

ISBN: (纸本)0819412864

Recent work has proven the feasibility and utility of 2-Normal segmentation as an image analysis tool. This technique, and the algorithm on which it is based, have shown dramatic and promising results for a number of image processing problems, such as clutter suppression, texture segmentation, motion analysis and object tracking. These capacities will be useful for clutter suppression, target location and classification, platform motion compensation, target tracking, vehicle guidance, battlefield mapping and target damage assessment. These and all applications of 2-Normal segmentation could easily employ and integrate multi-sensor data and /or multi-scale image preprocessing for analysis in two dimensions, three dimensions, or time sequence.

关键词： Image segmentation Wavelets Image processing algorithms and systems Image analysis Image processing algorithm development Detection and tracking algorithms Motion analysis Nonlinear filtering Wavelet transforms

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COMPARISON OF POINT-SOURCE algorithmS FOR OPTIMUM ACQUISITION RANGE OF ELECTROOPTICAL SENSOR

COMPARISON OF POINT-SOURCE ALGORITHMS FOR OPTIMUM ACQUISITIO...

引用

Conference on Signal and Data Processing of Small Targets 1994

作者： JHA, US ROCKWELL INT CORP DIV AUTONET ELECTR SYSTANAHEIMCA 92803

ISBN: (纸本)0819415391

This paper examines a special class of signal processing technique called Minimum Variance Deconvolution (MVD) method and compares it with the commonly used Matched filtering and Wiener filtering based deconvolution processing in point source acquisition signal processing applications for Electro-Optical sensors. A step by step development of the batch and recursive MVD algorithm including comparison with the competing methods are presented in this paper.

关键词： Filtering (signal processing) Electronic filtering Signal to noise ratio Signal processing Deconvolution Digital filtering Electro optical sensors algorithm development Electro optical modeling Error analysis

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