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检索条件"主题词=Algorithm development"

共 1735 条记录，以下是611-620 订阅

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On the Use of MBPE to Mitigate Corrupted Data in Radar Applications 25

On the Use of MBPE to Mitigate Corrupted Data in Radar Appli...

引用

Conference on Radar Sensor Technology XXV

作者： Maio, Brianna Dawood, Muhammed Loui, Hung Sandia Natl Labs 1515 Eubank Blvd SE Albuquerque NM 87123 USA New Mexico State Univ Elect & Comp Engn 1780 E Univ Ave Las Cruces NM 88003 USA

ISBN: (纸本)9781510643222

An algorithm is developed based on Edmund K. Miller's Model-Based Parameter Estimation (MBPE) technique to mitigate the effects of missing or corrupted data in random regions of wideband linear frequency modulated (LFM) radar signals. Two methods of applying MBPE in the spectral/frequency domain are presented that operate on either the full complex data or separated magnitude/phase data, respectively. The final algorithm iteratively applies MBPE using the latter approach to re-generate results in the corrupted regions of a windowed LFM signal until the difference is minimized relative to un-corrupted data. Several sets of simulations were conducted across many randomized gap parameters where impulse response (IPR) impacts are summarized. Conditions where the algorithm successfully improved the IPR for a single target are provided. The algorithm's effectiveness on multiple targets, especially when the corrupted regions are relatively large compared to the overall bandwidth of the signal, are also explored.

关键词： Radar algorithm development Data modeling Detection and tracking algorithms Model-based design Modulation

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SIGNAL PROCESSOR PACKAGING DESIGN (SPPD)

SIGNAL PROCESSOR PACKAGING DESIGN (SPPD)

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CONF ON ARCHITECTURE, HARDWARE, AND FORWARD-LOOKING INFRARED ISSUES IN AUTOMATIC TARGET RECOGNITION

作者： MCCARLEY, P PHIPPS, M Wright Lab. (United States)

ISBN: (纸本)0819411930

The Signal Processor Packaging Design (SPPD) program was a technology development effort to demonstrate that a miniaturized, high throughput programmable processor could be fabricated to meet the stringent environment imposed by high speed kinetic energy guided interceptor and missile applications. This successful program culminated with the delivery of two very small processors, each about the size of a large pin grid array package. Rockwell International's Tactical Systems Division in Anaheim, California developed one of the processors, and the other was developed by Texas Instruments' (TI) Defense Systems and Electronics Group (DSEG) of Dallas, Texas. The SPPD program was sponsored by the Guided Interceptor Technology Branch of the Air Force Wright Laboratory's Armament Directorate (WL/MNSI) at Eglin AFB, Florida and funded by SDIO's Interceptor Technology Directorate (SDIO/TNC). These prototype processors were subjected to rigorous tests of their image processing capabilities, and both successfully demonstrated the ability to process 128 X 128 infrared images at a frame rate of over 100 Hz.

关键词： Signal processing Image processing Digital signal processing Packaging Software development Data processing algorithm development Missiles Detection and tracking algorithms Electronics

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Using fractional gradient information in non-rigid image registration: application to breast MRI

Using fractional gradient information in non-rigid image reg...

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Conference on Medical Imaging - Image Processing

作者： Melbourne, A. Cahill, N. Tanner, C. Modat, M. Hawkes, D. J. Ourselin, S. UCL Ctr Med Image Comp London WC1E 6BT England Rochester Inst Technol Sch Math Sci Rochester NY 14623 USA

ISBN: (纸本)9780819489630

This work applies fractional differentiation (differentiation to non-integer order) to the gradients determined from image intensities for enhanced image registration. The technique is used to correct known simulated deformations of volumetric breast MR data using two algorithms: direct registration of gradient magnitude images and an extension of a previously published method that incorporates both image intensity and image gradient information to enhance registration performance. Better recovery of known deformations are seen when using non-integer order derivatives: half-derivative breast images are better registered when these methods are incorporated into a standard diffusion-based registration algorithm.

关键词： Image registration Breast Diffusion Image enhancement Brain Magnetic resonance imaging Computer simulations algorithm development Neuroimaging Image restoration

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FOUNDATIONS OF FUZZY NEURAL NETWORKS

FOUNDATIONS OF FUZZY NEURAL NETWORKS

引用

Conference on Applications of Fuzzy Logic Technology

作者： GUPTA, MM RAO, DH UNIV SASKATCHEWAN COLL ENGNINTELLIGENT SYST RES LABSASKATOON S7N 0W0SASKATCHEWANCANADA

ISBN: (纸本)0819413267

Over the last decade or so, significant advances have been made in two distinct areas: fuzzy logic and computational neural networks. The theory of fuzzy logic provides mathematical strength to compare the uncertainties associated with human cognitive processes, such as thinking and reasoning. Also, it provides a mathematical morphology to emulate certain perceptual and linguistic attributes associated with human cognition. On the other hand, the computational neural network paradigm has evolved in the process of understanding the incredible learning and adaptability of biological neural mechanisms. Neural networks replicate, on a small scale, some of the computational operations observed in biological learning and adaptation. The integration of these two fields, fuzzy logic and neural networks, has given birth to an emerging paradigm--the fuzzy neural networks. The fuzzy neural networks have the potential to capture the benefits of the two fascinating fields, fuzzy logic and neural networks, into a single capsule. The intent of this paper is to provide an introductory look at this emerging research field of fuzzy neural networks.

关键词： Fuzzy logic Neural networks Neurons Mathematical modeling algorithm development Distance measurement Robots Computing systems Control systems Logic

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AIRBORNE MINEFIELD DETECTION SYSTEM USING IR SENSING 2

AIRBORNE MINEFIELD DETECTION SYSTEM USING IR SENSING

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CONF ON SURVEILLANCE TECHNOLOGIES 2

作者： CLOUD, E DUVOISIN, H MAKSYMONKO, G Martin Marietta Corp. (United States) U.S. Army Belvoir Research Development and Engineering Ctr. (United States)

ISBN: (纸本)0819408581

This paper describes the work completed by Martin Marietta in support of the U.S. Army's standoff minefield detection system, advanced technology transition demonstration. This paper discusses the high priority and urgent need for the standoff mine detection system within the Army Combat Engineers, it presents the results of the successful application of non developmental technology/hardware in an airborne mine/minefield detection system, and it discusses the significant payoff of applying advanced ATR and high speed parallel processing. The technologies discussed include the IR imager as the source of mine imagery, advanced image processing algorithms including neural nets, and a high speed parallel processor unique to Martin Marietta called GAPP (geometric arithmetic parallel processor).

关键词： Land mines Image processing Standoff detection Sensors Unmanned aerial vehicles Neural networks Computing systems Parallel computing Video algorithm development

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Compression of digital mammograms using wavelets and learning vector quantization 2

Compression of digital mammograms using wavelets and learnin...

引用

Conference on Applications of Artificial Neural Networks in Image Processing II

作者： Wang, TC Karayiannis, NB U.S. Robotics (United States) Univ. of Houston (United States)

ISBN: (纸本)0819424412

This paper evaluates the performance of a system which compresses digital mammograms, In digital mammograms, important diagnostic features such as the microcalcifications appear in small clusters of few pixels with relatively high intensity compared with their neighboring pixels, These image features can be preserved in a compression system that employs a suitable image transform which can localize the signal characteristics in the original and the transform domain. Image compression is achieved by first decomposing the mammograms into different subimages carrying different frequencies, and then employing vector quantization to encode these subimages. Multiresolution codebooks are designed by the Linde-Buzo-Gray (LBG) algorithm and a family of fuzzy algorithms for learning vector quantization (FALVQ). The main advantage of the proposed approach is the design of separate multiresolution codebooks for different subbands of the decomposed image that carry different orientation and frequency information, The experimental results confirm the viability of the proposed compression scheme on digital mammograms.

关键词： Wavelets Image compression Image filtering Mammography Prototyping Quantization Filtering (signal processing) Electronic filtering Optical filters algorithm development

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EXPERIMENTAL-VERIFICATION OF AUTONOMOUS STAR FIELD IDENTIFICATION algorithm

EXPERIMENTAL-VERIFICATION OF AUTONOMOUS STAR FIELD IDENTIFIC...

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Infrared Remote Sensing Conference

作者： SCHOLL, MS ALENKA ASSOCIATES TEMPEAZ 85285

ISBN: (纸本)0819412686

A six-feature, all-sky star field identification algorithm has been developed for autonomous navigation. The minimum identifiable star pattern element consists of an ordered star triplet defined by three stars and their celestial coordinates (right ascension and declination). The star field identification algorithm was integrated with the CCD-based star tracker and tested at the Table Mountain Observatory. Real-time star field identification is reported with a CCD-based imaging camera interfaced to SPARC II workstation.

关键词： Stars Charge-coupled devices Detection and tracking algorithms Observatories Cameras CCD cameras Space telescopes Telescopes algorithm development Visualization

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Analysis of the transient response of MIS circuits using pseudo-wavelet approach

Analysis of the transient response of MIS circuits using pse...

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2nd International Conference on Solid State Crystals 2000 (ICSSC 2000)

作者： Plucinski, KJ Mil Univ Technol PL-00908 Warsaw Poland

This paper deals with the possibilities offered by the wavelet transform used in the analysis of the transient response of NHS circuits. This approach has certain advantages over the classical finite element or finite... 详细信息

ISBN: (纸本)0819441155

关键词： Wavelets Electrons algorithm development Device simulation Doping Crystals Dielectric relaxation Diffusion Partial differential equations Wavelet transforms

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Inspection of laser-seam welds in automobile manufacturing

Inspection of laser-seam welds in automobile manufacturing

引用

Conference on Thermosense XXVII

作者： Spellenberg, B Zettner, J Schreer, O Bassler, M Haller, M Lenzi, T Hierl, T Thermosensorik GmbH Erlangen Germany

ISBN: (纸本)0819457671

Recent developments in infrared camera technology, testing methods and data processing algorithms have brought significant progress for high resolution spatial and temporal analysis of thermal radiation. Together with industry standard automation technology and specific infrared image data processing it became possible to non destructively inspect laser welded seams and other types of joints using heat flux analysis subsequent to active thermal excitation. High thermal diffusion coefficients of the usually metallic samples under test make the availability of high-speed infrared cameras as a key hardware component indispensable. Since high-speed infrared cameras with frame rates of at least 500 Hz have become available for commercial applications, non-destructive testing systems with a new class of performance were designed, manufactured, and implemented at industrial sites. Heat flux analysis as a new and robust method of non-destructive testing has been implemented for various types of equipment, ranging from off-line tools for laboratory use to automated robot based systems enabling fast and operator-free in-line inspection. Depending on environment, implementation surroundings, and geometry of objects to be inspected, different types of pulsed or continuous operating heat sources (e.g. flash light, laser,...) are selected. Due to its outstanding industrial relevance some examples of non-destructive testing of laser welded seams in automobile manufacturing are shown.

关键词： Infrared radiation Infrared imaging Convection Thermography Manufacturing Infrared cameras Inspection Heat flux algorithm development Silver

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Simplified correction of B₁ inhomogeneity for chemical exchange saturation transfer (CEST) MRI measurement with surface transceiver coil

Simplified correction of B<sub>1</sub> inhomogeneity for che...

引用

Conference on Medical Imaging - Biomedical Applications in Molecular, Structural, and Functional Imaging

作者： Sun, Phillip Zhe Zhou, Iris Yuewen Igarashi, Takahiro Guo, Yingkun Xiao, Gang Wu, Renhua Massachusetts Gen Hosp Athinoula A Martinos Ctr Biomed Imaging Dept Radiol Charlestown MA 02129 USA Harvard Univ Sch Med Charlestown MA USA Sichuan Univ West China Univ Hosp 2 Dept Radiol Chengdu 610064 Peoples R China Shantou Univ Affiliated Hosp 2 Coll Med Dept Radiol Shantou Guangdong Peoples R China

ISBN: (纸本)9781628415070

Chemical exchange saturation transfer (CEST) MRI is sensitive to dilute exchangeable protons and local properties such as pH and temperate, yet its susceptibility to field inhomogeneity limits its in vivo applications. Particularly, CEST measurement varies with RF irradiation power, the dependence of which is complex due to concomitant direct RF saturation (RF spillover) effect. Because the volume transmitters provide relatively homogeneous RF field, they have been conventionally used for CEST imaging despite of their elevated specific absorption rate (SAR) and relatively low sensitivity than surface coils. To address this limitation, we developed an efficient B-1 inhomogeneity correction algorithm that enables CEST MRI using surface transceiver coils. This is built on recent work that showed the inverse CEST asymmetry analysis (CESTRind) is not susceptible to confounding RF spillover effect. We here postulated that the linear relationship between RF power level and CESTRind can be extended for correcting B-1 inhomogeneity induced CEST MRI artifacts. Briefly, we prepared a tissue-like Creatine gel pH phantom and collected multi-parametric MRI including relaxation, field map and CEST MRI under multiple RF power levels, using a conventional surface transceiver coil. The raw CEST images showed substantial heterogeneity due to B-1 inhomogeneity, with pH contrast to noise ratio (CNR) being 8.8. In comparison, pH MRI CNR of the field-inhomogeneity corrected CEST MRI was found to be 17.2, substantially higher than that without correction. To summarize, our study validated an efficient field inhomogeneity correction that enables sensitive CEST MRI with surface transceiver, promising for in vivo translation.

关键词： Magnetic resonance imaging Transceivers In vivo imaging algorithm development Absorption Radiology Synthetic aperture radar Transmitters Biomedical optics Tissues

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