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检索条件"主题词=Algorithm development"

共 1737 条记录，以下是1361-1370 订阅

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OPTIMAL DELAYED-CODING OF VIDEO SEQUENCES SUBJECT TO A BUFFER-SIZE CONSTRAINT

OPTIMAL DELAYED-CODING OF VIDEO SEQUENCES SUBJECT TO A BUFFE...

引用

Meeting on Visual Communications and Image Communication 93

作者： LIN, DW WANG, MH CHEN, JJ BELLCORE MORRISTOWNNJ 07960

ISBN: (纸本)0819413690

A video encoder has the task of producing lowest-distortion coded video subject to some constraints on delay, rate, and buffer conditions. We present a general optimization approach to this problem in a framework of delayed coding and we motivate a certain formulation of the optimization objective. Two forms of distortion measures are considered, namely, the maximum distortion and the total distortion, each defined over a segment of the video to be coded. These distortion measures are chosen for their mathematical tractability and practical importance. A solution (computational algorithm) for each case is described. Subject to some conditions, the solutions may be suboptimal. Simulation results show an improved performance with this approach compared to a simple typical approach which varies the quantization scale linearly with the encoder buffer level.

关键词： Video Distortion Video coding Computer programming Quantization algorithm development Error analysis Radon Optimization (mathematics) Video processing

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QUANTIFYING THE SUPERRESOLUTION CAPABILITIES OF THE CLEAN IMAGE-PROCESSING algorithm 15

QUANTIFYING THE SUPERRESOLUTION CAPABILITIES OF THE CLEAN IM...

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CONF ON APPLICATIONS OF DIGITAL IMAGE PROCESSING 15

作者： HUNT, BR Univ. of Arizona (United States)

ISBN: (纸本)0819409448

The problem of image restoration has an extensive literature (e.g.J1^^’^) and can be expressed as the solution of an integral equation of the first kind. Conventional linear restoration methods reconstruct spatial frequencies below the diffraction-limited cutoff of the optical aperture. Nonlinear methods, such as maximum entropy^, have the potential to reconstruct frequencies above the diffraction limit. Reconstruction of information above diffraction we refer to as super-resolution. Specific algorithms developed for super-resolution are the iterative algorithms of Gerchbergf5! and Papoullis^, the maximum likelihood method of Holmes^, and the Poisson maximum-a-posteriori algorithm of Hunrf8^. The experimental results published with these algorithms show the potential of super-resolution, but are not as satisfactory as an analytical treatment. In the following we present a model to quantify the capability of super-resolution, and discuss the model in the context of the well-known CLEAN algorithm.

关键词： Super resolution Sensors Photons algorithm development Point spread functions Image processing Error analysis Reconstruction algorithms Signal to noise ratio Diffraction

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IMAGE COMPRESSION WITH THE WAVELET TRANSFORM

IMAGE COMPRESSION WITH THE WAVELET TRANSFORM

引用

Meeting on Visual Communications and Image Communication 93

作者： ARGAST, J RAMPTON, M QIU, X MOON, T UTAH STATE UNIV DEPT ELECT ENGNLOGANUT 84322

ISBN: (纸本)0819413690

We present a new algorithm for coefficient selection during image compression using the wavelet transform for decomposition and reconstruction. This new algorithm assigns a weight to each scale so that coefficients from a high resolution scale are more likely to be discarded before coefficients from a low resolution scale. Results show our algorithm introduces less error into the reconstructed image than the sort method developed by DeVore/em et al.

关键词： Image compression Wavelets Reconstruction algorithms Wavelet transforms Image resolution algorithm development Digital imaging Electrical engineering Electroluminescence Fourier transforms

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SIGNAL-PROCESSING OF INFRARED DUAL-BAND DATA

SIGNAL-PROCESSING OF INFRARED DUAL-BAND DATA

引用

5TH CONF ON SIGNAL AND DATA PROCESSING OF SMALL TARGETS

作者： RIVKIN, PD GE Aerospace (United States)

ISBN: (纸本)0819411906

This paper addresses pre-detection signal processing of dual-band detection algorithms, a generalized likelihood ratio test and modified sample matrix inversion, are developed for the case of gaussian interference. The associated theoretical detection performance and computational requirements are also derived. General detection performance formulas are provided which can be used to determine the conditions for which the dual-band algorithms provide the greatest improvement in performance. The utility of the dual-band detection algorithms is demonstrated by comparison with the optimal single- and dual-band likelihood ratio tests as well as the single-band GLRT and MSMI algorithms. The dual-band algorithms are also compared with a system using two single-band filter channels whose outputs are combined after thresholding. Results are generated from theoretical formulas and from a simulation, developed at GE, which duplicates the filtering and detection functions of the algorithms.

关键词： Detection and tracking algorithms algorithm development Signal processing Filtering (signal processing) Target detection Signal to noise ratio Statistical analysis algorithms Image filtering Infrared search and track

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IMAGE COMPONENT LABELING USING LOCAL OPERATORS 4

IMAGE COMPONENT LABELING USING LOCAL OPERATORS

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4TH CONF ON IMAGE ALGEBRA AND MORPHOLOGICAL IMAGE PROCESSING

作者： SHI, HC RITTER, GX Univ. of Florida (United States)

Binary image component labeling is a fundamental process in image processing and computer vision. This paper presents several image component labeling algorithms with local operators expressed in the language of image... 详细信息

ISBN: (纸本)0819412791

关键词： Binary data Image processing Image storage Machine vision Adaptive optics Computer vision technology Image analysis Silicon algorithm development Image visualization

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DETERMINING THE FRACTAL DIMENSION OF SCENES AND DIGITAL SIGNALS USING ROSETA AND OTHER NOVEL APPROACHES 2

DETERMINING THE FRACTAL DIMENSION OF SCENES AND DIGITAL SIGN...

引用

CONF ON SIGNAL PROCESSING, SENSOR FUSION, AND TARGET RECOGNITION 2

作者： JAENISCH, HM BARTON, PE CARRUTH, RT Nichols Research Corp. (United States) U. S. Army Space and Strategic Defense Command (United States)

ISBN: (纸本)0819411914

The use of fractal statistics for characterizing and synthesizing scenes and signals has in recent time been demonstrated as feasible. Traditionally global fractal dimensions based on morphological coverings were used to quantify the texture of sampled data sets. This texture could be used to describe the second order statistics in 2D scenes or in the jaggedness and fine structure of time series. With the realization of the benefits of fractal analysis has come a need for faster and more efficient computational algorithms. ROSETA is an algorithm which yields substantial computational performance improvements by calculating entropy based statistics instead of morphological geometric statistics. ROSETA may be used as a robust general purpose analytical tool and several examples of its implementation are described.

关键词： Fractal analysis Statistical analysis Aluminium phosphide Computer simulations Data conversion algorithm development Data processing Dynamical systems Signal processing Yield improvement

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ASSIGNMENT algorithm FOR TRACKING MULTIPLE MANEUVERING TARGETS WITH POSITION MEASUREMENTS FROM DISTANT SENSORS

ASSIGNMENT ALGORITHM FOR TRACKING MULTIPLE MANEUVERING TARGE...

引用

5TH CONF ON SIGNAL AND DATA PROCESSING OF SMALL TARGETS

作者： YIN, MR LEONDES, CT Litton Data Systems (United States) Univ. of California/San Diego (United States)

ISBN: (纸本)0819411906

A sensor-to-track assignment algorithm is developed for a multisensor tracking system to track multiple maneuvering targets. These sensors are spatially distributed and track multiple targets at the same time. To maintain track continuity of approaching targets is the keynote of this algorithm. When local sensors disagree on which central track to update with their local tracks, this algorithm provides an effectiveness function to resolve the conflict. When measurements from all sensors are used to update central tracks, this algorithm can select or request measurements from the more effective sensors to track potential maneuvering targets.

关键词： Sensors Detection and tracking algorithms Target detection Switches Error analysis algorithm development Aluminum Surveillance Time metrology Control systems

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GROUND-PENETRATING RADAR APPLICATIONS - DEPARTMENT-OF-ENERGY CASE-STUDIES

GROUND-PENETRATING RADAR APPLICATIONS - DEPARTMENT-OF-ENERGY...

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CONF ON UNDERGROUND AND OBSCURED OBJECT IMAGING AND DETECTION

作者： KOPPENJAN, S BASHFORTH, M Special Technologies Lab. (United States)

ISBN: (纸本)0819411787

The ability to detect and image buried objects has gained in popularity over the past decade. The use of new subsurface radar techniques and advanced signal processing has increased the probability of success. Paleontology and life science fields have benefitted from advances in ground penetrating radar technology. The United States Department of Energy's Special Technologies Laboratory (STL) staff has been using and developing ground penetrating radar instrumentation and imaging algorithms since 1968. STL has developed a stepped FM-CW Ground Penetrating Radar (GPR) that operates from 196 MHz to 708 MHz. Included is a brief technical description on this fully self-contained unit. Several sample data sets also are described for familiarization with the unique data format of this GPR. This paper describes how ground penetrating radar can be applied to paleontology and tunnel imaging, its limitations and several case study results.

关键词： General packet radio service Bone Ground penetrating radar Data acquisition Radar Dielectrics Target detection algorithm development Radar imaging Erbium

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CLASS OF algorithmS FOR REALTIME SUBPIXEL REGISTRATION

CLASS OF ALGORITHMS FOR REALTIME SUBPIXEL REGISTRATION

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Conference on Computer Vision for Industry

作者： FRISCHHOLZ, RW SPINNLER, KP FRAUNHOFER INST INTEGRATED CIRCUITS IIS WETTERKREUZ 13W-8520 ERLANGENGERMANY

ISBN: (纸本)0819412384

In 1972, Barnea and Silverman presented a new approach to the wide field of template matching, the SSD-algorithm. Further work has been done to adapt the method to gain subpixel accuracy. Intense investigation of the proposed algorithms led to our new approach: by interpolating the template instead of the reference image, and by applying sort of an error- correction to the resulting subpixel-value, both computation time and accuracy can be improved. Exhaustive experiments with a CCD-camera and various kinds of reference images showed that a maximum error of 10% of the pixel period can be expected. Depending on the kind of image, mean square errors range from 0.4% to 4%.

关键词： Image registration Computer vision technology Machine vision Distance measurement Image resolution Error analysis Image processing algorithm development CCD cameras Charge-coupled devices

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NEUROCONTROL - CONCEPTS AND APPLICATIONS 2

NEUROCONTROL - CONCEPTS AND APPLICATIONS

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2ND INTERNATIONAL CONF ON ADAPTIVE LEARNING SYSTEMS

作者： SAMAD, T Honeywell Sensors & Systems Development Ctr. (United States)

ISBN: (纸本)0819411981

Neural networks provide several distinctive features that are of substantial relevance to control technology. These include: accurate approximations of nonlinear functions and nonlinear dynamical systems; compact, efficient implementations; and data-intensive rather than expertise-intensive model and controller development. The benefits of neural networks for control applications are now being realized in numerous domains. We discuss several ways neural networks can be used for modeling and control. For modeling applications, neural networks have been trained to realize `black-box' forward and inverse process models as well as parametric models. Neural network controllers can be developed by emulating existing controllers, by model-free optimization, and by model-based optimization. Examples from deployed applications, available products, and the technical literature illustrate these concepts. We conclude by discussing some important topics for future research: dynamic neural networks, incremental learning, and application-specific network design.

关键词： Neural networks Systems modeling Process modeling Data modeling Control systems Model-based design algorithm development Dynamical systems Information operations Optimization (mathematics)

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