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检索条件"主题词=Algorithm development"

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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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COMPARISON OF SSM/T-2 AND SSM/I ESTIMATES OF TOTAL PRECIPITABLE WATER

COMPARISON OF SSM/T-2 AND SSM/I ESTIMATES OF TOTAL PRECIPITA...

引用

CONF ON MICROWAVE INSTRUMENTATION FOR REMOTE SENSING OF THE EARTH

作者： GLASS, M GRIFFIN, MK FELDE, GW PICKLE, JD Air Force Phillips Lab. (United States) Atmospheric and Environmental Research Inc. (United States)

ISBN: (纸本)081941171X

Total Precipitable Water (TPW) calculations using the Special Sensor Microwave Water Vapor Sounder (SSM/T-2) launched November 1991 on the Defense Meteorological Satellite Program (DMSP) F-11 satellite are compared with TPW values obtained from analysis of the collocated Special Sensor Microwave Imager (SSM/I). The four data sets used were collected over the ocean. The different characteristics of these instruments are described. Their response to the ambient conditions indicate that the two independent measures of TPW generally agree within 20 percent over the range of TPW observed. Some direct measurements of TPW obtained from radiosondes at the time and in proximity to the satellite overpasses are presented for independent comparison.

关键词： Clouds Satellites Microwave radiation Sensors Meteorological satellites algorithm development Defense and security Image sensors Imaging systems Satellite imaging

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SIMULATION OF IMAGES OF SOME NATURAL OBJECTS 2

SIMULATION OF IMAGES OF SOME NATURAL OBJECTS

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CONF ON VISUAL INFORMATION PROCESSING 2

作者： KOVALENKOVA, NV MALYSHEV, IA S. I. Vavilov State Optical Institute (Russia)

Image simulating based on real images is duscussed, using the technique of fractal representation. At the first stage the fractal features are calculated from real images, and at the second stage these features are us... 详细信息

ISBN: (纸本)0819411973

关键词： Fractal analysis algorithm development Data modeling Image processing Computer simulations Distortion Image analysis Image quality Statistical analysis Statistical modeling

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PHASE-STEPPING DIGITAL SPECKLE-PATTERN INTERFEROMETRY AND ITS APPLICATIONS

PHASE-STEPPING DIGITAL SPECKLE-PATTERN INTERFEROMETRY AND IT...

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CONF ON INTERFEROMETRY : TECHNIQUES AND ANALYSIS

作者： ZHENG, W Guangzhou Univ. (China)

ISBN: (纸本)0819409286

This paper describes an automated measuring system using reversal two-step phase algorithm. An automated analysis package has been developed for phase-stepped fringe fields. Factors limiting the measuring accuracy and reliability are discussed. This system has been applied to the measurements of thermal deformation, in-plan deformation, resonant vibration amplitude measuring, and nondestructive testing of carbon fiber honeycomb structure.

关键词： Fringe analysis Speckle Interferometry Speckle pattern algorithm development Nondestructive evaluation Carbon Phase interferometry Reliability Structured optical fibers

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PIPELINED ADAPTIVE DFE ARCHITECTURES 4

PIPELINED ADAPTIVE DFE ARCHITECTURES

引用

4TH CONF ON ADVANCED SIGNAL PROCESSING algorithmS, ARCHITECTURES, AND IMPLEMENTATIONS

作者： SHANBHAG, NR PARHI, KK Univ. of Minnesota/Twin Cities (United States)

ISBN: (纸本)0819412767

Fine-grain pipelined adaptive decision-feedback equalizer (ADFE) architectures are developed using the relaxed look-ahead technique. This technique, which is an approximation to the conventional look-ahead computation, maintains functionality of the algorithm rather than the input-output behavior. Thus, it results in substantial hardware savings as compared to either parallel processing or look-ahead techniques. The delay relaxation, delay transfer relaxation, and sum relaxation are introduced for purposes of pipelining. Both the conventional and the predictor form of ADFE have been pipelined. The performance of the pipelined algorithms for the equalization of a magnetic recording channel is studied. It is demonstrated via simulations that, for a byte error rate of 10^-7 or less, speed-ups of up to 8 can be easily achieved with the conventional ADFE. The predictor form of ADFE allows much higher speed-ups (up to 32) for less than 1 dB of SNR degradation.

关键词： Signal to noise ratio Magnetism algorithm development Error analysis Optical filters Digital filtering Finite impulse response filters Nonlinear filtering Parallel processing Transform theory

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RETRIEVAL OF TROPOSPHERIC PROFILES FROM IR EMISSION-SPECTRA - PRELIMINARY-RESULTS WITH THE DBIS

RETRIEVAL OF TROPOSPHERIC PROFILES FROM IR EMISSION-SPECTRA ...

引用

Conference on Atmospheric Radiation

作者： THERIAULT, JM ANDERSON, GP CHETWYND, JH MURPHY, E TURNER, V CLOUTIER, M SMITH, A MONCET, JL DREV QUEBEC CITY G0A 1R0PQCANADA

ISBN: (纸本)0819413089

Recently, Smith and collaborators from University of Wisconsin-Madison have clearly established the possibilities of sounding tropospheric temperature and water vapor profiles with a ground-based uplooking interferometer. With the same perspective but for somewhat different applications, the Defence Research Establishment Valcartier (DREV) has initiated a project with the aim of exploring the many possible avenues of similar approaches. DREV, in collaboration with BOMEM (Quebec, Canada), has developed an instrument referred to as the Double Beam Interferometer Sounder (DBIS). This sounder has been conceived to match the needs encountered in many remote sensing scenarios: slant path capability, small field of view, very wide spectral coverage, and high spectral resolution. Preliminary tests with the DBIS have shown sufficient accuracy for remote sensing applications. In a series of field measurements, jointly organized by the Geophysics Directorate/PL, Hanscom AFB, and DREV, the instrument has been run in a wide variety of sky conditions. Several atmospheric emission spectra recorded with the sounder have been compared to calculations with FASCODE and MODTRAN models. The quality of measurement-model comparisons has prompted the development of an inversion algorithm based on these codes. The purpose of this paper is to report the recent progress achieved in this research. First, the design and operation of the instrument are reviewed. Second, recent field measurements of atmospheric emission spectra are analyzed and compared to models predictions. Finally, the simultaneous retrieval approach selected for the inversion of DBIS spectra to obtain temperature and water vapor profiles is described and preliminary results are presented.

关键词： Atmospheric modeling Interferometers algorithm development Black bodies Spectral resolution Absorption Mirrors Telescopes Temperature metrology Geophysics

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ROBUST COMPUTATIONAL VISION 6

ROBUST COMPUTATIONAL VISION

引用

CONF ON SENSOR FUSION 6

作者： SCHUNCK, BG Univ. of Michigan (United States)

ISBN: (纸本)0819413240

This paper presents a paradigm for formulating reliable machine vision algorithms using methods from robust statistics. Machine vision is the process of estimating features from images by fitting a model to visual data. Vision research has produced an understanding of the physics and mathematics of visual processes. The fact that computer graphics programs can produce realistic renderings of artificial scenes indicates that our understanding of vision processes must be quite good. The premise of this paper is that the problem in applying computer vision in realistic scenes is not the fault of the theory of vision. We have good models for visual phenomena, but can do a better job of applying the models to images. Our understanding of vision must be used in computations that are robust to the kinds of errors that occur in visual signals. This paper argues that vision algorithms should be formulated using methods from robust regression. The nature of errors in visual signals is discussed, and a prescription for formulating robust algorithms is described. To illustrate the concepts, robust methods have been applied to several problems: surface reconstruction, dynamic stereo, image flow estimation, and edge detection.

关键词： Data modeling Visual process modeling algorithm development Sensors Visualization Error analysis Edge detection Computer vision technology Machine vision Sensor fusion

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PROGRAM PACKAGE OF DECAY KINETICS ANALYSIS IN PULSE PHOTOMETRY 8

PROGRAM PACKAGE OF DECAY KINETICS ANALYSIS IN PULSE PHOTOMET...

引用

9th CIS Conferences on Photometry

作者： APANASOVICH, VV NOVIKOV, EG MINSK STATE UNIV MINSK 220080 BELARUS

ISBN: (纸本)0819414565

When analyzing curves of intensity decay in pulse photometry of optical radiation, the problem of estimation of unknown parameters of the decay function representable as a sum of exponents Ii 1(t) = A1 exp (— t/t1), i=l (1) where A - amplitudes, rj - decay times, i = 1 , . . . , n, arises. It is rather complicated to carry out such studies because in the majority of cases recorded time responses are in the nanosecond interval of duration. The last requires to take into account the influence of imperfect characteristics of recording equipment, which leads to the necessity of solving integral equations of the convolution type

关键词： Photometry algorithm development Differential equations Statistical analysis Convolution Software development Data processing Error analysis Numerical simulations Stochastic processes

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