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检索条件"主题词=Algorithm development"

共 1735 条记录，以下是551-560 订阅

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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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Three-dimensional diffuse optical tomography with full multi-view time-domain data

Three-dimensional diffuse optical tomography with full multi...

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Conference on Optical Tomography and Spectroscopy of Tissue X

作者： Dominguez, Jorge Bouza Berube-Lauziere, Yves Univ Sherbrooke Fac Genie Dept Genie Elect & Genie Informat Lab TomOptUS Sherbrooke PQ J1K 2R1 Canada

ISBN: (纸本)9780819493477

In this work, synthetic time-domain data are generated as if it were collected with a state-of-the-art multi-view experimental optical scanner developed in our group for small animal imaging, and used in a tomographic image reconstruction algorithm. The collected data comprises full time-dependent optical signals leaving the biological medium and acquired all around the medium. The diffuse optical tomography (DOT) algorithm relies on the time-dependent parabolic simplified spherical harmonics (TD-pSP(N)) equations as the forward model to recover the 3D absorption and diffusion coefficient maps of the medium. The inverse problem is casted and solved as an iterative constrained optimization problem where an objective function determines the accuracy of the forward model predictions at each iteration. Time-dependent adjoint variables are introduced to accelerate the calculation of the gradient of the objective function. A three-dimensional case involving an absorption heterogeneity in a homogeneous medium is presented, reproducing practical situations encountered in our lab. The results support our hypothesis that accurate quantitative 3D maps of optical properties of biological tissues can be retrieved using intrinsic measurements obtained with our experimental scanner along with our DOT algorithm.

关键词： Absorption 3D modeling Inverse problems Tissues algorithm development Diffuse optical tomography Sensors Tomography Inverse optics Reconstruction algorithms

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A prospective modular platform of the mask pattern automatic inspection using the die-to-database method

A prospective modular platform of the mask pattern automatic...

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Conference on Photomask and Next-Generation Lithography Mask Technology XII

作者： Avakaw, S Korneliuk, A Tsitko, A Planer State Sci & Prod Concern Precis Machine Bl Minsk 220763 BELARUS

ISBN: (纸本)0819458538

The paper presents a description of a new modular automatic reticle defect inspection platform and also a description of one of the main elements of this platform - a defect detection sub-system. This platform is currently under active development at Planar Concern. This paper presents the results of the use of the object-oriented approach which was used in the development of the defect detection algorithms for the die-to-database reticle inspection system. Furthermore, the paper presents briefly the architecture and technology of the new modular automatic reticle inspection platform.

关键词： Inspection Reticles Defect detection Detection and tracking algorithms Image processing algorithm development Photomasks Databases Sensors Image transmission

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Pre-processing algorithm and airborne campaign result analysis of a rotating fan-beam scatterometer 3

Pre-processing algorithm and airborne campaign result analys...

引用

Conference on Earth Observing Missions and Sensors - development, Implementation, and Characterization III

作者： Xu, Xing-ou Dong, Xiaolong Zhu, Di Lin, Wenming Chinese Acad Sci Natl Space Sci Ctr CAS Key Lab Microwave Remote Sensing Beijing 100190 Peoples R China Inst Marine Sci ICM CSIC Barcelona 08003 Spain

ISBN: (纸本)9781628413311

A Rotating fan-beam scatterometer (RFSCAT), which provides a set of different incidence and azimuth angle combinations and wide continuous swath coverage, will be flown on the Chinese-French Oceanography Satellite (CFOSAT). In this paper, a pre-processing algorithm is developed to estimate the backscatter coefficient (sigma(0)) of RFSCAT, which includes the procedures of system distortion correction, thermal noise removal, internal signal calibration, and elimination of the observing geometry effects. The algorithm is then tested using the experimental data from an airborne campaign. The estimated s0 are consistent with Nscat-2 geophysical model function (GMF), indicating that the pre-processing chain acts well for RFSCAT.

关键词： Calibration Signal processing Interference (communication) Digital signal processing Distortion Radar algorithm development Antennas Backscatter Satellites

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STOCHASTIC SEARCH algorithm-BASED MULTILINK NEURAL-NETWORK 2

STOCHASTIC SEARCH ALGORITHM-BASED MULTILINK NEURAL-NETWORK

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CONF ON SCIENCE OF ARTIFICIAL NEURAL NETWORKS 2

作者： LANG, ZP ZHANG, Z Medical Univ. of South Carolina (United States)

ISBN: (纸本)0819412023

In this paper we present a new network architecture based on a Multi-Link Neural Network (MLNN) model. An MLNN has a structure similar to that of a feedforward network except that each connection between a pair of nodes in the hidden layer and the output layer is made of multiple links with possibly different weight values. This results in an aggregation of a combinatorial number of subnets that themselves can be viewed as ordinary feedforward networks. For an MLNN with M hidden nodes, N output nodes, and K links for each connection, its overall connection status is represented as an MN dimensional region with K^MN sampling points in the weight space. Thus the multi-link structure defines a sampling grid over this region.A region-based search algorithm has been developed that, for problems of a complex nature, offers a better chance in locating a global minimum than the traditional backpropagation algorithm.

关键词： Error analysis Neural networks algorithm development Artificial neural networks Optimization (mathematics) Animal model studies Detection and tracking algorithms Evolutionary algorithms Network architectures Stochastic processes

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SURVEY OF COMMERCIAL SOFTWARE FOR MULTISENSOR DATA FUSION

SURVEY OF COMMERCIAL SOFTWARE FOR MULTISENSOR DATA FUSION

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CONF ON SENSOR FUSION AND AEROSPACE APPLICATIONS

作者： HALL, DL LINN, RJ HRB Systems Inc. (United States)

ISBN: (纸本)0819411922

Multi-sensor data fusion technology is rapidly maturing. In recent years, numerous algorithms and techniques have been introduced or applied ranging from classic estimation and statistical methods (e.g., Bayesian inference), and pattern recognition methods, to heuristic techniques such as expert systems and templating techniques. Because of the range and variety of techniques, Hall and Linn (1990) developed a taxonomy which maps data fusion functions to classes of algorithms and to specific techniques. This paper describes a survey of commercial software tools applicable to multi-sensor data fusion. The paper identifies specific software programs, summarizes the required computing resources (hardware and software environment), and identifies the source of the software. The survey maps the computer software to the data fusion taxonomy, establishing the relationships between data fusion levels, functions, and algorithms. The intent of this paper is to allow the data fusion community to readily access these software building blocks without reinvention. Thus, building new data fusion systems may be performed with significant use of commercial off the shelf software.

关键词： Data fusion Data modeling Software development Taxonomy algorithm development Computing systems Commercial off the shelf technology Statistical analysis Sun Visualization

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COMPRESSION AND PROGRESSIVE TRANSMISSION OF ASTRONOMICAL IMAGES 5

COMPRESSION AND PROGRESSIVE TRANSMISSION OF ASTRONOMICAL IMA...

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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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DATA FUSION OF OUTPUTS PROVIDED BY A DISTRIBUTED FIELD OF PASSIVE SENSORS

DATA FUSION OF OUTPUTS PROVIDED BY A DISTRIBUTED FIELD OF PA...

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4TH CONF ON THE SIGNAL AND DATA PROCESSING OF SMALL TARGETS 1992

作者： JEWITT, TW General Atronics Corp. (United States)

ISBN: (纸本)0819408638

As a result of an on-going IR&D effort, General Atronics Corporation (GAC) has developed effective algorithms for automatic acquisition, tracking, and recognition of multiple targets - broadly referred to as Automatic Target Recognition (ATR) - using passive sensors on board multiple distributed platforms. The goal of AIR is to either provide timely and accurate assistance to a human operator, who is the ultimate decision maker, or he totally autonomous in extracting the necessary information, its processing, and final decision making. Applications of this technology include Electro-Optical Fire Control Systems (EOFCS), Infrared Search and Track (IRST), Infrared Counter Measures (IRCM), Covert Aircraft Recovery and Tracking Systems (CARTS), Strategic Defense Initiative (SDI), Anti-Submarine Warfare (ASW), Battlefield Intelligence, and Security.

关键词： Sensors Detection and tracking algorithms Target detection Data processing Target recognition Passive sensors Signal processing algorithm development Automatic target recognition Data fusion

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Driver/passenger discrimination for the interaction with the dual-view touch screen integrated to the automobile centre console

Driver/passenger discrimination for the interaction with the...

引用

Conference on Image Processing - algorithms and Systems X and Parallel Processing for Imaging Applications II

作者： Herrmann, Enrico Makrushin, Andrey Dittmann, Jana Vielhauer, Claus Otto Von Guericke Univ Univ Pl 2 D-39106 Magdeburg Germany Univ Appl Sci Brandenburg Magdeburg Germany

ISBN: (纸本)9780819489425

In an attempt to further develop and evaluate the optical recognition systems for distinguishing between driver and front-seat passenger during their interactions with dual-view touch screen integrated to the automobile centre console, this work focuses on the enhancement of both image processing algorithms and experimental environment. In addition to the motion based forearm and hand segmentation and the texture based arm direction analysis, the adaptive boosting classifiers with Haar-like features have been engaged for the learning of driver's and passenger's hand patterns. The user discrimination system was completely reproduced in a laboratory, including passenger compartment with genuine dashboard, touch screen, camera and near-infrared lamps, so that different illumination conditions could be modeled. The new acquisition system allows automatic and unambiguous registration of all touch screen interactions and their synchronization with the video stream. This results in credible evaluation of the image processing routines. The adjustment of the camera position and the active infrared illumination made it possible to reduce the recognition error rates and to achieve superior discrimination performance compared to previous works.

关键词： Detection and tracking algorithms Video algorithm development Cameras Image processing Light sources and illumination Lamps Imaging systems Image segmentation Motion analysis

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Gray scale optical correlator 9

Gray scale optical correlator

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Conference on Optical Pattern Recognition IX

作者： Chao, TH Reyes, G Park, YC CALTECH Jet Prop Lab Ctr Space Microelect Technol Pasadena CA 91109 USA

ISBN: (纸本)0819428353

A compact (Camcorder size), ultrahigh-speed, grayscale optical correlator capable of using grayscale input and real-valued correlation filter is reported. The unique bipolar-amplitude correlation filter modulation capability has enabled the direct implementation of composite filter algorithm such as MACH [8]. The direct usage of grayscale input also eliminated the need of image preprocessing (e.g. Sober filtering used for binary optical correlator). System architecture of this grayscale optical correlator will be described. Experimental results obtained using optically implemented MACH filter, for the first time, will also be provided.

关键词： Optical correlators Spatial light modulators Optical filters Image filtering Distortion Modulation Target detection LCDs algorithm development Composites

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