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检索条件"主题词=Algorithm development"

共 1737 条记录，以下是1321-1330 订阅

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REAL-TIME MULTIRESOLUTIONAL TARGET TRACKING

REAL-TIME MULTIRESOLUTIONAL TARGET TRACKING

引用

5TH CONF ON SIGNAL AND DATA PROCESSING OF SMALL TARGETS

作者： HONG, L WERTHMANN, JR BIERMAN, GS WOOD, RA Wright State Univ. (United States) Air Force Wright Lab. (United States)

A real-time multiresolutional approach for target tracking is developed in this paper. The wavelet transform is utilized to provide the multiresolutional measurements and bridge information at different resolutional l... 详细信息

ISBN: (纸本)0819411906

关键词： Wavelet transforms algorithm development Detection and tracking algorithms Filtering (signal processing) Matrices Electronic filtering Wavelets Data acquisition Signal processing Switching

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NEW APPROACH TO CALCULATE THE SPATIAL AND TEMPORAL RADIANCE DISTRIBUTION IN ATMOSPHERE AND OCEAN FROM SOURCES AND BACKGROUNDS 3

NEW APPROACH TO CALCULATE THE SPATIAL AND TEMPORAL RADIANCE ...

引用

CONF ON CHARACTERIZATION, PROPAGATION, AND SIMULATION OF SOURCES AND BACKGROUNDS 3

作者： ZEGE, EP KATSEV, IL POLONSKY, IN Institute of Physics (Belarus)

ISBN: (纸本)0819412031

A multicomponent approach to calculate a light field structure with allowance for multiple scattering in the media such as clouds, mists and ocean water is given. All characteristic properties of the real phase function are regarded and propagation in a scattering medium of any optical thickness with an arbitrary single scattering albedo can be considered. The phase function is represented as a sum of more simple functions. The radiance is given as a sum of appropriate components. The equations like the radiative transfer equation are obtained for each component. They can be solved using the known methods within domains where they work best of all. Comparison of various solutions (lidar returns, temporal structure of light pulse transmitted by cloud, an angular structure of the light reflected from and transmitted by cloud) with different numerical calculations shows a fairly satisfactory accuracy of our analytical formulas.

关键词： Clouds Scattering Light scattering algorithm development Diffusion LIDAR Fourier transforms Light Ocean optics Scattering media

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UNIFIED THEORY OF TIME-SEQUENTIAL SAMPLING

UNIFIED THEORY OF TIME-SEQUENTIAL SAMPLING

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CONF ON VIDEO AND IMAGE PROCESSING

作者： BRESLER, Y WILLIS, NP Univ. of Illinois/Urbana-Champaign (United States)

ISBN: (纸本)0819411361

We consider the sampling of band-limited spatio-temporal signals subject to the time- sequential (TS) constraint that only one spatial sample can be taken at a given time. Using the powerful techniques of lattice theory, we develop a new unifying theory linking TS sampling with generalized multidimensional sampling. The theory, which applies to arbitrary spatial and spectral supports in any dimension, includes tight fundamental performance bounds, which are asymptotically achievable. Simple graphical design algorithms are provided for lattice sampling patterns minimizing the sampling rates, and illustrated by examples.

关键词： Image processing Video processing Information operations Stars Composites Sensors Matrices Optical spheres algorithm development Reconstruction algorithms

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ELECTROMECHANICAL SURFACE DAMPING USING CONSTRAINED LAYER AND SHUNTED PIEZOELECTRIC

ELECTROMECHANICAL SURFACE DAMPING USING CONSTRAINED LAYER AN...

引用

1993 NORTH AMERICAN CONF ON SMART STRUCTURES AND MATERIALS

作者： GHONEIM, H Rochester Institute of Technology (United States)

ISBN: (纸本)0819411523

An electromechanical surface damping (EMSD) technique is proposed. The technique is a combination of the constrained layer damping and the shunted piezoelectric methods, where the viscoelastic layer attached to the surface of the vibrating substructure is constrained by a shunted piezoelectric ceramic element. A mathematical model of the dynamic behavior of the coupled piezoelectric/constrained layer/substructure (EMSD element) is developed, implemented into a finite element algorithm, and used to investigate the effect of some of the system parameters on the dynamic characteristics (the first three natural frequencies and modal loss factors) of a generic cantilever beam. The effect of the following system parameters is considered: storage modulus ratios, material loss factors, thickness ratios, and the axial location of the EMSD element. The algorithm is also used to demonstrate the effectiveness of the proposed EMSD technique in controlling the peak vibration amplitudes at the first two natural frequencies of the cantilever beam.

关键词： algorithm development Mathematics Smart structures algorithms Ceramics Mathematical modeling Composites Electroluminescence Environmental sensing Vibration control

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PRECISION HIGH-TEMPERATURE BLACKBODIES 4

PRECISION HIGH-TEMPERATURE BLACKBODIES

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CONF ON ULTRAVIOLET TECHNOLOGY 4

作者： SAPRITSKY, VI JOHNSON, BC SAUNDERS, RD VLASOV, LV SUDAREV, KA KLEVNOY, BB SHAPOVAL, VI DMITRIEV, IA BUCHNEV, LM PROCHOROV, AV National Institute of Standards and Technology (United States) All-Union Research Institute for Optical and (Russia)

This paper reviews the research and design of high temperature blackbody sources for the temperature interval from 2000 K to 3000 K. Sources with large apertures are addressed specifically, as these are well suited to... 详细信息

ISBN: (纸本)0819409375

关键词： Black bodies Tungsten Temperature metrology Lamps Standards development Ultraviolet radiation algorithm development Radiometry Resistance Sensors

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OPTIMUM DISPLACEMENT ESTIMATES USING MEAN-FIELD ANNEALING

OPTIMUM DISPLACEMENT ESTIMATES USING MEAN-FIELD ANNEALING

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CONF ON IMAGE MODELING

作者： ABDELQADER, I RAJALA, S BILBRO, G SNYDER, W North Carolina State Univ. (United States) Bowman Gray School of Medicine/Wake Forest Univ. (United States)

ISBN: (纸本)081941137X

In this paper a new algorithm to estimate dense displacement fields from a sequence of images is developed. The algorithm is based on modeling the displacement fields as Markov Random fields. The Markov Random fields-Gibbs equivalence is then used to convert the problem into one of finding an appropriate energy function that describes the motion and any constraints imposed on it. Mean field annealing, a technique which finds global minima in nonconvex optimization problems, is used to minimize the energy function, and solve for the optimum displacement fields. The algorithm results in accurate estimates even for scenes with noise or discontinuities.

关键词： Annealing Motion estimation Motion models algorithm development Interference (communication) Blood Heart Magnetic resonance imaging Magnetism Medicine

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DETECTING SMALL DEBRIS USING A GROUND-BASED PHOTON-COUNTING DETECTOR

DETECTING SMALL DEBRIS USING A GROUND-BASED PHOTON-COUNTING ...

引用

CONF ON SPACE DEBRIS DETECTION AND MIGRATION

作者： HO, C PRIEDHORSKY, B BARON, M Los Alamos National Lab. (United States)

ISBN: (纸本)0819411876

We describe a sensitive technique for detecting small space debris that exploits a fast photon- counting imager. Microchannel plate detectors using crossed delay-line readout can achieve a resolution of 2048 X 2048 spatial pixels and a maximum count rate of about 10⁶ photons per second. A baseline debris-tracking system might couple this detector to a 16-cm aperture telescope. The detector yields x, y, and time information for each detected photon. When visualized in (x,y,t) space, photons from a fast-moving orbital object appear on a straight line. They can be distinguished from diffuse background photons, randomly scattered in the space, and star photons, which fall on a line with sidereal velocity. By searching for this unique signature, we can detect and track small debris objects. At dawn and dusk, a spherical object of 1.3 cm diameter at 400 km will reflect sunlight for an apparent magnitude of V approximately equals 16. The baseline system would detect about 16 photons from this object as it crosses a 1 degree field of view in about 1 second. The line in (x,y,t) space will be significant in a diffuse background of approximately 10⁶ photons. We discuss the data processing scheme and line detection algorithm. The advantages of this technique are that one can (1) detect cm-size debris objects with a small telescope, and (2) detect debris moving with any direction and velocity.

关键词： Sensors Space telescopes Detection and tracking algorithms Photon counting algorithm development Computer simulations Data acquisition Data processing Telescopes Imaging systems

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ALTERNATIVES TO HIERARCHICAL TECHNIQUES IN STEREO CORRELATION

ALTERNATIVES TO HIERARCHICAL TECHNIQUES IN STEREO CORRELATIO...

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CONF ON INTEGRATING PHOTOGRAMMETRIC TECHNIQUES WITH SCENE ANALYSIS AND MACHINE VISION

作者： NORVELLE, FR U.S. Army Topographic Engineering Ctr. (United States)

ISBN: (纸本)0819411809

When digital stereo correlation methods are used to generate elevation data from stereo images of the terrain, the likelihood that the correlation process will be successful throughout the whole of the stereo model can be enhanced significantly by using hierarchical, multi-scale, pyramidal, coarse-to-fine, etc., techniques. One main advantage of these techniques is that the correlation data obtained at a lower resolution in the hierarchical procedure is used to guide and control the correlation process at the next higher resolution and, consequently, the user can be reasonably assured that the correlation process will not get 'lost'. Unfortunately, constraints imposed by results obtained at the lower resolution can also lead to generation of erroneous elevation data in some circumstances. For example, if the terrain is spotted with individual trees, buildings or other structures, the correlation process, when performed on the low resolution images, will include approximations to the heights of these features in the resulting elevation data. These are erroneous elevations compared to the 'bald earth' and their influence will be carried from one step to the next in the hierarchical procedure. The result will be a 'noisy' digital elevation model (DEM) containing approximations to the elevations of trees and structures on the terrain and not just the terrain itself.

关键词： Orthophoto maps Image processing Data modeling Image resolution Process control algorithm development Buildings 3D displays Photography Platinum

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LASER DIAGNOSTICS OF WATER ECOSYSTEMS - CONCEPTION AND METHODS

LASER DIAGNOSTICS OF WATER ECOSYSTEMS - CONCEPTION AND METHO...

引用

4TH INTERNATIONAL CONF ON LASER APPLICATIONS IN LIFE SCIENCES : LASER STUDY OF MACROSCOPIC BIOSYSTEMS ( LALS 92 )

作者： FADEEV, VV Moscow State Univ. (Russia)

ISBN: (纸本)0819411558

A description of the general principles being developed at Moscow University for laser diagnostic methods of monitoring water ecosystems is presented in the present paper. A brief historical survey of investigations in this field is provided with the formulation of the problems which should be solved. The latest results obtained in Moscow University are summarized. These results are discussed in a series of papers presented in these proceedings and reported at several recent international conferences.

关键词： Luminescence Diagnostics Raman spectroscopy Ecosystems algorithm development LIDAR Laser scattering Remote sensing Biological research Laser development

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IMAGE COMPRESSION AND SANN EQUATIONS 4

IMAGE COMPRESSION AND SANN EQUATIONS

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4th International Conference on Applications of Artificial Neural Networks

作者： LIU, Y SAVANNAH STATE COLL DEPT MATH & COMP SCISAVANNAHGA 31404

ISBN: (纸本)0819412015

Image compression can be achieved by using stochastic artificial neural networks (SANN). The idea is to store an image in stable distribution of a stochastic neural network. Given an input image f (epsilon) F, one can find a SANN t (epsilon) T such that the equilibrium distribution this SANN is the given image f. Therefore, the input image, f, is encoded into a specification of a SANN, t. This mapping from F (image space) to T (parameter space of SANN) defines SANN transformation. To complete a SANN transformation, an SANN equation has to be solved. In this paper, we will first introduce two types of SANN equations. Then, we will develop an algorithm to solve SANN equation.

关键词： Stochastic processes Neural networks Neurons Artificial neural networks Image compression Dynamical systems algorithm development Computer programming Data compression Fractal analysis

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