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检索条件"主题词=Algorithm development"

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

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

引用

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

引用

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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IMAGE-CODING BASED ON ZEROCROSSING AND ENERGY INFORMATION

IMAGE-CODING BASED ON ZEROCROSSING AND ENERGY INFORMATION

引用

Meeting on Visual Communications and Image Communication 93

作者： BASSO, A GEURTZ, A KUNT, M ECOLE POLYTECH FED LAUSANNE TRAITEMENT SIGNAUX LABCH-1015 LAUSANNESWITZERLAND

ISBN: (纸本)0819413690

In this paper we propose a complete subband-based codec for image compression purposes, using a new 2D algorithm based on zero-crossing and energy information. Although signal representation based on sign information is attractive from a coding point of view, two major problems inhibited its practical use, namely the large amount of side information needed for obtaining a stable reconstruction and the efficient treatment of inherently 2D signals. The new algorithm significantly improves the reconstruction results obtained in our previous work, thanks to its improved convergence and its capabilities to deal with the two-dimensional nature of the subband image signals. The zero-crossing information is compressed in a lossless way using the JBIG standard and the energy information in a lossy way using an arithmetic coder. Good results have been obtained both at the reconstruction and at the coding level, which show the feasibility of the global scheme.

关键词： Reconstruction algorithms Image compression algorithm development Image restoration Signal processing Bandpass filters Electronic filtering Image quality standards Nonlinear optics Distortion

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INTER-ACTOR CONFLICT MEDIATION WITHIN A MULTISENSOR TACTICAL THREAT ASSESSMENT SYSTEM 2

INTER-ACTOR CONFLICT MEDIATION WITHIN A MULTISENSOR TACTICAL...

引用

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

作者： CHUBB, DWJ U.S. Army CECOM RDEC Intelligence and Electronic Warfare Directorate (United States)

ISBN: (纸本)0819411914

A multisensor tactical threat assessment system is being developed by the US Army CECOM RDEC Intelligence and Electronic Warfare Directorate (lEWD). Roughly speaking, the current system consists of a tactical hypothesis generator and a hypothesis evaluation algorithm. The hypothesis generator is capable of developing complex multi-Actor tactical plans. Plans have a symbolic representation which is then instantiated with actual tactical data to produce an activity model. The hypothesis evaluation algorithm uses the activity model to synthesize possible Actor actions which may satisfy the plan goals. Multi-Actor plans are synthesized individually for each Actor. Thus, each Actor maintains his own peculiar "world-view' of the battlefield during the problem solving process. The resulting implementation is a highly distributed and parallel problem solver. This methodology assumes a deterministic relationship between Actor action execution and the Actor's digital feature space which is a raster picture element (pixel). Spatial changes caused by Actor action execution within a pixel are broadcast to other Actors within the domain using a standard AT BlackBoard (BB). Nondeterministic relationships between Actors are produced whenever the local spatial or temporal goals of two or more Actors conflict with one another. For example, inter-Actor conflict may be produced when two or more Actors attempt to move to the same pixel at the same instant of time. Actor movement can become deadlocked if both Actors cannot co-occupy the same pixel, i.e. ,the McNeil paradox. Recently, a realistic solution to the McNeil paradox was developed by the author. The solution algorithm uses Actor action execution information which has been posted on the BB to develop a global strategy which effectively mediates Actor conflicts. The approach is general enough to encourage the development of a general theory of Actor conflict, including both cooperative and adversarial Actor relationships. The auth

关键词： Raster graphics algorithm development Control systems Data modeling Data conversion Silicon Tactical intelligence Warfare Aluminum Chemical elements

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DIGITAL PLANE SEGMENTS

DIGITAL PLANE SEGMENTS

引用

CONF ON VISION GEOMETRY

作者： CHATTOPADHYAY, S DAS, PP Jadavpur Univ. (India) Indian Institute of Technology/Kharagpur (India)

ISBN: (纸本)0819410330

Study of digital plane segments (dps) is fundamental to three dimensional digital geometry. In this paper we present an optimal algorithm to characterize a given set S of 3-D digital points as a dps and to construct its upper supporting plane. We have also formulated a number of area estimators for dps's and have measured their performances analytically and experimentally.

关键词： Double positive medium Vision geometry Stereolithography Surface plasmons Image segmentation 3D image processing Reconstruction algorithms algorithms algorithm development Computer science

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ADAPTIVE PROCESSING IN RADAR POLARIMETRY

ADAPTIVE PROCESSING IN RADAR POLARIMETRY

引用

CONF ON RADAR POLARIMETRY

作者： WANG, Y OUMANSOUR, K POTTIER, E SAILLARD, J IRESTE/Univ. of Nantes (France)

ISBN: (纸本)0819409219

In this paper, an adaptive polarimetric system is proposed, which allows for the minimization of the contribution of a stationary clutter by adapting the polarization state of the receiving antenna to the polarimetric signature of the environment by using the minimum power criterion. From the knowledge of the polarimetric signature of the environment and by applying the least mean square criterion, we can detect the presence of targets and estimate their polarimetric parameters. An algorithm of CFAR (Constant False Alarm Rate) is developed to detect the presence of a radar target and of its disappearance.

关键词： Polarimetry Radar Target detection Polarization Sensors Detection and tracking algorithms Antennas algorithm development Environmental sensing Matrices

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