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检索条件"主题词=Algorithm development"

共 1737 条记录，以下是1161-1170 订阅

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RECONSTRUCTION OF PHYSICAL FIELDS OF FLUID BASED ON INTERFEROMETRIC IMAGE SEQUENCES

RECONSTRUCTION OF PHYSICAL FIELDS OF FLUID BASED ON INTERFER...

引用

Conference on Laser Applications in Combustion and Combustion Diagnostics II

作者： LIU, K LU, JF LIU, LJ SHEN, XJ HU, Q YANG, JY NANJING UNIV SCI & ENGN DEPT COMP SCINANGING 210014PEOPLES R CHINA

ISBN: (纸本)0819414158

In practical applications, it is possible to acquire multidirectional interferometric data of different instants. In such cases, refractive-index fileds can be reconstructed based on the multidirectional interferometric data of two consecutive times. The advantages of using the interferometric data of different instants include: more a priori information and knowledge about refractive-index fields can be incorporated in reconstruction and the problem of sovling velociety, temperature and pressure fields will be simplified. In this paper. An iterative direct 3D reconstruction algorithm from the interferometric data of two consecutive times is presented. The problem of calculating physical fields of fluid is discussed. The experimental results are also provided.

关键词： Interferometry Reconstruction algorithms Fluid dynamics Geometrical optics 3D modeling algorithm development Data acquisition Silicon Computer science Lutetium

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STUDIES OF ADVANCED DETECTION TECHNOLOGY SENSOR (ADTS) DATA

STUDIES OF ADVANCED DETECTION TECHNOLOGY SENSOR (ADTS) DATA

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Conference on algorithms for Synthetic Aperture Radar Imagery

作者： MORRISON, DP ECKERT, AC SHIELDS, FJ SCI APPLICAT INT CORP ARLINGTONVA 22203

ISBN: (纸本)0819415340

The need to understand the statistical and spectral characteristics of synthetic aperture radar (SAR) data prompted the analysis of ADTS SAR data. The analysis included statistical and spectral analyses, with an emphasis on understanding the impact of the SAR processing on the scene properties. Several models were developed, including a SAR Processing model and a scene generating model which explicitly models the scene speckle. As a result, a documented and tested FORTRAN program is available for spectral analysis. The statistical and spectral characteristics form the basis of ongoing SAR modeling.

关键词： Synthetic aperture radar Statistical analysis Data modeling Image processing Sensors Statistical modeling Speckle Analytical research Polarization algorithm development

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PERFORMANCE PREDICTION OF TRACKING IN CLUTTER WITH NEAREST-NEIGHBOR FILTERS

PERFORMANCE PREDICTION OF TRACKING IN CLUTTER WITH NEAREST-N...

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Conference on Signal and Data Processing of Small Targets 1994

作者： LI, XR BARSHALOM, Y UNIV HARTFORD DEPT ELECT ENGNW HARTFORDCT 06117

ISBN: (纸本)0819415391

The measurement that is `closest' to the predicted target measurement is known as the `nearest neighbor' measurement in target tracking. A common method currently in wide use for tracking in clutter is the so-called nearest neighbor filter, which uses only the nearest neighbor measurement as if it is the true one. This paper presents a technique for prediction without recourse to expensive Monte Carlo simulations of the performance of the nearest neighbor filter. This technique can quantify the dynamic process of tracking divergence as well as the steady state performance. The technique is based on a general approach to the performance prediction of algorithms with both continuous and discrete uncertainties developed recently by the authors.

关键词： Electronic filtering Error analysis Plasma display panels Target detection algorithm development Monte Carlo methods Detection and tracking algorithms Filtering (signal processing) Time metrology Aluminum

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ADAPTIVE SPATIAL SPECTRAL DETECTION OF SUBPIXEL TARGETS WITH UNKNOWN SPECTRAL CHARACTERISTICS

ADAPTIVE SPATIAL SPECTRAL DETECTION OF SUBPIXEL TARGETS WITH...

引用

Conference on Signal and Data Processing of Small Targets 1994

作者： FERRARA, CF WJ SCHAFER ASSOCIATES INC ROMENY 13440

ISBN: (纸本)0819415391

This paper extends the maximum likelihood concept as applied to the adaptive detection of sub-pixel targets with unknown spectral signatures. The clutter is modeled stochastically with a spatial-spectral covariance matrix. The target model is primarily stochastic and partially deterministic. Within any given spectral band the spatial target signature is deterministic. For the sub-pixel target application, a system point spread function (PSF) is used. The PSF is allowed to vary spectrally, due to the dependency of a sensor's diffractive PSF on the spectral wavelength. The spectral target signature is completely stochastic and must be determined at each pixel using maximum likelihood estimation techniques. Based on these assumptions, an optimal maximum likelihood processor is derived. Encouraging performance results are presented from real IR data. Detection probabilities are shown in many cases to improve significantly when compared to spatial-only detection processes.

关键词： Detection and tracking algorithms Target detection Data modeling Image processing Databases Digital filtering Point spread functions Optical filters Statistical modeling algorithm development

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GENETIC algorithmS FOR TERRAIN CATEGORIZATION OF LANDSAT IMAGES 22

GENETIC ALGORITHMS FOR TERRAIN CATEGORIZATION OF LANDSAT IMA...

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22nd AIPR Workshop on interdisciplinary Computer Vision: Applications and Changing Needs

作者： LARCH, D MRJ INC OAKTONVA 22124

ISBN: (纸本)0819413909

We have developed a method that uses genetic algorithms (GAs) to optimize rules for categorizing the terrain in Landsat data. A rule has two parts: a left side (the `if' clause) and a right side (the `then' clause). When the `if' clause is true, the functions in the `then' clause are executed to process the Landsat data. Examples of functions for processing the data include pixel by pixel threshold and a linear combination of six bands. Optimized rules are used to identify different terrain categories within Landsat data. Optimization is performed by comparing the results of the rules with ground truth using an objective function which minimizes the number of false positives and false negatives. Those rules that generate results close to the ground truth (those rules that return a small number of false positive and false negative pixel identifications) are highly rewarded and are used to create the next generation of rules. United States Geological Survey Land Use Land Cover data and an analyst's interpretation of the Landsat image were used as ground truth. The GA produced promising results for terrain categorization. More work in the area of terrain categorization is planned to build on these promising results.

关键词： Earth observing sensors Landsat Genetic algorithms Image processing algorithm development Binary data Data processing Genetics Gallium Optimization (mathematics)

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INTERACTIVE STEREOSCOPIC IMAGE DISPLAY SYSTEM FOR PERSONAL COMPUTERS

INTERACTIVE STEREOSCOPIC IMAGE DISPLAY SYSTEM FOR PERSONAL C...

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Conference on Stereoscopic Displays and Applications V/Conference on the Engineering Reality of Virtual Reality

作者： MIYAZAWA, A SHIMIZU, K SUGIMOTO, K IBM RES TOKYO RES LABKANAGAWA 242JAPAN

ISBN: (纸本)0819414727

We have developed an experimental stereoscopic display system for personal computers that utilizes a lenticular array and a high-resolution color liquid crystal display panel. This article discusses the principles of stereopsis used in the system, describes the system's mechanism and features, and evaluates the performance of its graphics system. We also developed a color image quantization algorithm specifically for this display device. In addition, we proposed a technique for interactive 3D manipulation of objects, which uses two trackballs to allow movement and rotation through six degrees of freedom.

关键词： Computing systems LCDs Eye Image display Stereoscopic displays Visualization 3D displays 3D image processing algorithm development Quantization

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TUNING USING ELECTROMECHANICAL SURFACE DAMPING

TUNING USING ELECTROMECHANICAL SURFACE DAMPING

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Passive Damping Conference

作者： GHONEIM, H ROCHESTER INST TECHNOL DEPT MECH ENGNROCHESTERNY 14623

ISBN: (纸本)0819414883

The electromechanical surface damping (EMSD) technique, for controlling the peak vibration amplitudes of beam-like structures, is modified to extend the effective range of the approach. The technique is a combination of the constrained layer damping and the shunted piezoelectric methods, where the viscoelastic constrained layer attached to the vibrating surface is constrained by a shunted piezoelectric ceramic element. The mathematical model of the modified EMSD element is presented, implemented into a finite element algorithm and applied to demonstrate the ability of the technique to simultaneously and effectively suppress the first three resonant peaks of a generic aluminum cantilever beam.

关键词： Ceramics Mathematical modeling Aluminum algorithm development Composites Electroluminescence Vibration control Environmental sensing Mechanical engineering Reliability

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VIDEO COMPRESSION BY COEFFICIENT COMPENSATION

VIDEO COMPRESSION BY COEFFICIENT COMPENSATION

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Conference on Digital Video Compression on Personal Computers: algorithms and Technologies

作者： YAMAGUCHI, H TEXAS INSTRUMENTS INC TSUKUBA RES & DEV CTRTSUKUBAIBARAKI 305JAPAN

ISBN: (纸本)0819414824

This paper discusses a new video compression algorithm called Coefficient Compensation that achieves high performance by optimizing the DCT encoding loop structure, and demonstrates its improvement characteristic as compared with the conventional JPEG or MPEG I/P picture encoding under the condition that movement compensation is not available. The first part of the paper analyzes the performance of the DCT encoding loop structure, the method of optimization and the concept of soft-decision. The second part reports on the simulation results. Encoding performance is tested by various MPEG test sequences compressed in 20 Mbits/sec. The difference between JPEG and MPEG I is in the quantization table. For JPEG, the quantization table widely accepted as one producing a good compression quality is used. All the encoded binary outputs are fully compatible to the MPEG2 syntax but additional 2 bits/block information is coded as the user data for the Coefficient Compensation.

关键词： Computer programming Video compression Video Quantization Binary data Motion estimation Silicon Video coding algorithm development Video processing

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FUZZY OBJECTS AND THEIR BOUNDARIES

FUZZY OBJECTS AND THEIR BOUNDARIES

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3rd Conference on Visualization in Biomedical Computing 1994 (VBC 94)

作者： UDUPA, JK SAMARASEKERA, S VENUGOPAL, KP GREVERA, G UNIV PENN DEPT RADIOLPHILADELPHIAPA 19104

ISBN: (纸本)0819416983

Measured data are inherently inaccurate. Operations done on data for defining, visualizing, manipulating and analyzing object information should attempt to retain these inaccuracies as accurately as possible. The theory of fuzzy sets is a proper mathematical vehicle for this purpose. In this attempt, topological notions such as adjacency, connectedness, and boundary need to be developed starting from fuzzy sets. We develop such a framework in this paper and present algorithms for finding fuzzy connected components and boundaries in digital imagery. We demonstrate the usefulness of these algorithms in medical applications, particularly in separating objects that come close together which are otherwise difficult to segment using hard (non-fuzzy) criteria.

关键词： Fuzzy logic Visualization Surgery Visual analytics algorithm development Image segmentation Volume rendering Binary data Biomedical optics Image processing algorithms and systems

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FAST OPENING FUNCTIONS AND MORPHOLOGICAL GRANULOMETRIES 5

FAST OPENING FUNCTIONS AND MORPHOLOGICAL GRANULOMETRIES

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Conference on Image Algebra and Morphological Image Processing V

作者： VINCENT, L XEROX IMAGING SYST PEABODYMA 01960

ISBN: (纸本)081941624X

In this paper, a comprehensive set of fast algorithms for computing granulometries in binary images is first proposed: linear granulometries (i.e., granulometries based on openings with line segments) constitute the easiest case, and are computed using image `run-length'. The 2D case (granulometries with square or `diamond'-shaped structuring elements, or granulometries with unions of line-segments at different orientations) involves the determination of opening functions or granulometry functions. The grayscale case is then addressed, and a new algorithm for computing grayscale linear granulometries is introduced. This algorithm is orders of magnitude faster than any previously available technique. The techniques introduced in this paper open up a new range of applications for granulometries, examples of which are described in the paper.

关键词： Binary data Image segmentation Image processing algorithms and systems Diamond algorithm development Image analysis Image processing Feature extraction Lanthanum Raster graphics

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