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检索条件"主题词=Algorithm Development"

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RELATIONAL TEMPLATE MATCHING algorithm FOR FLIR AUTOMATIC TARGET RECOGNITION

RELATIONAL TEMPLATE MATCHING ALGORITHM FOR FLIR AUTOMATIC TA...

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

作者： KRAMER, AP PERSCHBACHER, D JOHNSTON, R KIPP, T Alliant Techsystems Inc. (United States) U.S. Army Research Lab. (United States)

Under the Army Night Vision & Electronic Sensors Directorate and the Army Research Laboratory (S3I) sponsored ATR Relational Template Matching (ARTM) program, we have developed a novel model-based forward-look... 详细信息

ISBN: (纸本)0819411930

Under the Army Night Vision & Electronic Sensors Directorate and the Army Research Laboratory (S³I) sponsored ATR Relational Template Matching (ARTM) program, we have developed a novel model-based forward-looking infrared (FLIR) automatic target recognition (ATR) algorithm with superior performance over other model-based and template matching algorithms. The ARTM algorithm represents a significant advance over other approaches because its performance is relatively insensitive to the extreme variations of target signatures in FLIR imagery. The algorithm has been extensively evaluated in Army-sponsored competitive tests on low-depression ground target scenarios. The ARTM algorithm correctly recognizes target signatures at less than one-half the signal-to-noise level required by other approaches. Also the algorithm performs consistently over signature variations with up to 30 percent shape error.

关键词： Detection and tracking algorithms algorithm development Computer aided design Target recognition Solid modeling Forward looking infrared Automatic target recognition Performance modeling Sensors Model-based design

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LINE-SCAN VISION SYSTEMS

LINE-SCAN VISION SYSTEMS

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Conference on Computer Vision for Industry

作者： GODBER, SX ROBINSON, M EVANS, P NOTTINGHAM TRENT UNIV DEPT ELECT & ELECTR ENGN3-D IMAGING GRPNOTTINGHAM NG1 4BUENGLAND

ISBN: (纸本)0819412384

This paper describes research into 3D line-scan systems for applications covering inspection and both autonomous and semi-autonomous control. Image generation using line-scan devices requires relative motion between camera and object. The type of motion investigated has concentrated on lateral displacement and the rotation of the line-scan device in relation to a static object or scene. Results are presented on the accuracy of the lateral displacement arrangement in resolving the position of points in the object space in all three co-ordinate axes.

关键词： Cameras Line scan image sensors Imaging systems Sensors Televisions Computer vision technology Machine vision Computing systems Control systems algorithm development

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AUTOMATED RECOGNITION OF MICROCALCIFICATION CLUSTERS IN MAMMOGRAMS

AUTOMATED RECOGNITION OF MICROCALCIFICATION CLUSTERS IN MAMM...

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CONF ON BIOMEDICAL IMAGE PROCESSING AND BIOMEDICAL VISUALIZATION

作者： BANKMAN, IN CHRISTENSBARRY, WA KIM, DW WEINBERG, IN GATEWOOD, OB BRODY, WR Johns Hopkins Univ. (United States)

ISBN: (纸本)0819411388

The widespread and increasing use of mammographic screening for early breast cancer detection is placing a significant strain on clinical radiologists. Large numbers of radiographic films have to be visually interpreted in fine detail to determine the subtle hallmarks of cancer that may be present. We developed an algorithm for detecting microcalcification clusters, the most common and useful signs of early, potentially curable breast cancer. We describe this algorithm, which utilizes contour map representations of digitized mammographic films, and discuss its benefits in overcoming difficulties often encountered in algorithmic approaches to radiographic image processing. We present experimental analyses of mammographic films employing this contour-based algorithm and discuss practical issues relevant to its use in an automated film interpretation instrument.

关键词： Mammography Breast cancer Detection and tracking algorithms algorithm development Tissues Visualization Interference (communication) Breast Cancer Radiology

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MULTIPLE LASER-BEAM COMBINING AND PHASING USING CLOSED-LOOP CONTROL II

MULTIPLE LASER-BEAM COMBINING AND PHASING USING CLOSED-LOOP ...

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1993 SMART STRUCTURES AND MATERIALS : ACTIVE AND ADAPTIVE OPTICAL COMPONENTS AND SYSTEMS 2

作者： NEAL, DR SMITH, TG EISLER, GR WILCOXEN, JL ROSENTHAL, RR Sandia National Labs. (United States)

ISBN: (纸本)0819411531

One method for scaling lasers to higher power is to build several separate amplifier chains, and then coherently combine the individual beams together. To combine the beams the pathlengths must be matched to an integer number of waves, and the tip and tilt of each beam must be the same. Since optical tolerances are fractional micrometers, a sophisticated control system must be employed to actively measure tip/tilt and piston errors, and apply real time corrections. We have developed a test bed that allows us to develop the required control algorithms for two to four beams and then scale to a larger number.

关键词： Sensors Wavefront sensors Actuators Mirrors Control systems Image segmentation Ferroelectric materials algorithm development Photodiodes Wavefronts

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EFFICIENT EDGE-DETECTION BY SCALE ADAPTATION AND RECURSIVE HALF-SPACE FILTERING

EFFICIENT EDGE-DETECTION BY SCALE ADAPTATION AND RECURSIVE H...

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Conference on Recent Advances in Sensors, Radiometric Calibration, and Processing of Remotely Sensed Data

作者： CRAWFORD, MM LAU, PF UNIV TEXAS DEPT MECH ENGNAUSTINTX 78712

ISBN: (纸本)0819411744

A new edge detection algorithm has been developed and implemented that has both good speed and accuracy properties. The accuracy of the approach is derived from scale adaptation through anisotropic diffusion. The speed of the filter is based on recursive filtering. Specifically, the algorithm is implemented through a decomposition of the recursive filter into a convolution of two independent half space filters. This further improves the speed of the recursive filter and facilitates scale adaptation. The resulting algorithm is 1 - 2 orders of magnitude faster than comparable Gaussian based frequency domain and spatial domain methods. The new filter is omni-directional and super-elongated. It is also contour following, has computational complexity which is independent of scale, and has no truncation noise. The algorithm has been implemented and successfully applied to SPOT XS and Landsat MSS and TM imagery as one component of a region based image segmentation scheme.

关键词： Digital filtering Convolution Edge detection Image segmentation Diffusion algorithm development Image filtering Anisotropic diffusion Detection and tracking algorithms Smoothing

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COST-EFFECTIVE IMPLEMENTATION OF PASSIVE RANGING algorithmS ON GENERAL-PURPOSE PARALLEL ARCHITECTURES

COST-EFFECTIVE IMPLEMENTATION OF PASSIVE RANGING ALGORITHMS ...

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CONF ON SENSOR FUSION AND AEROSPACE APPLICATIONS

作者： KARMARKAR, JS SRIDHAR, B LAKSHMANAN, M Innovative Configuration Inc. (United States) NASA Ames Research Ctr. (United States)

ISBN: (纸本)0819411922

A broad variety of passive ranging algorithms are currently being developed and enhanced at NASA Ames and elsewhere. Some of the factors resulting in algorithm variability include (a) number of sensors (e.g., stereo), (b) type of input sensors (e.g., multispectral), and (c) output display needs (e.g., history vectors superimposed on raw video). This paper describes a cost- effective, real-time general purpose (reprogrammable) computationally scalable digital processing architecture that enables researchers to perform comparative evaluations in a laboratory or field environment. Performance benchmark studies indicate that the passive ranging algorithm developed at NASA-Ames can be executed by a 32 processor based shared memory multiprocessor architecture, implemented on two (9U) VME boards.

关键词： Video Sensors algorithm development Ranging Computer architecture Video processing Computing systems Very large scale integration Data processing Digital signal processing

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PARAMETRIC METHODS FOR NONSTATIONARY SEISMIC DATA-ANALYSIS 4

PARAMETRIC METHODS FOR NONSTATIONARY SEISMIC DATA-ANALYSIS

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

作者： MAIWALD, D MOLLE, JWD BOHME, JF Ruhr-Univ. Bochum (Germany) Imperial College of Science Technology and Medicine (United Kingdom)

ISBN: (纸本)0819412767

We investigate the estimation of both the number of waves and the wave parameters for transient wavefields in a geophysical application. Models of the earth have to be verified by seismogram analysis. We present two nonparametric methods for the estimation of wave parameters where one is based on the first-order stationary spectrum and the other one is based on the second-order cumulant spectrum. We also investigate a parametric method for wave parameter estimation which allows us to determine the number of incident waves. The algorithms are applied to synthetic seismic data.

关键词： Sensors Data modeling Phased arrays Signal detection algorithm development Data analysis Fourier transforms Statistical analysis Earthquakes Wave propagation

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LINEAR-TIME RECOGNITION OF DIGITAL POLYNOMIAL CURVES AND SURFACES THAT HAVE PERIODIC DIFFERENCES 2

LINEAR-TIME RECOGNITION OF DIGITAL POLYNOMIAL CURVES AND SUR...

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Vision Geometry II Conference

作者： VEELAERT, P STATE UNIV GHENT VAKGRP ELISB-9000 GHENTBELGIUM

ISBN: (纸本)0819413259

Digital polynomial curves and surfaces arise from the digitization of algebraic surfaces such as lines, parabolas, planes, or paraboloids. It is known that the n-th difference of a digital polynomial curve of degree n is periodic for polynomials that have rational coefficients. In this paper we consider the following problem: Suppose we have a digital curve S whose n-th difference is known to be periodic. When is S a digital rational polynomial curve? As a solution to this problem we state a simple criterion that can be checked in linear time. As a first application of this criterion we describe a linear time algorithm for the recognition of digital straight lines. In comparison to other algorithms, the advantages of the new algorithm are its simplicity, and its ability to actually find the coefficients of the rational polynomial representing the line. We then go on to discuss the applicability of this criterion to the recognition of digital curves and surfaces of arbitrary degree.

关键词： Detection and tracking algorithms Reconstruction algorithms Vision geometry Information operations algorithm development Astatine Image analysis Image segmentation Pattern recognition Shape analysis

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COMPARATIVE-STUDIES WITH TOVS DATA OF SYNOPTIC SITUATIONS OVER EUROPE

COMPARATIVE-STUDIES WITH TOVS DATA OF SYNOPTIC SITUATIONS OV...

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CONF ON PASSIVE INFRARED REMOTE SENSING OF CLOUDS AND THE ATMOSPHERE

作者： KLAES, KD EUMETSAT (Germany)

ISBN: (纸本)0819411701

Results are presented of the analyses of the 3D structure of the atmosphere with TOVS sounding data for two atmospheric situations over Europe. Both situations include the occurrence of thunderstorms. The retrieval methods used are the International TOVS Retrieval Package (ITPP-4) and the Improved Initialization Inversion (`3I-2') algorithm. These methods are applied to locally received real-time direct readout HRPT data. Both methods show meso scale phenomena in the temperature fields, represented by the thicknesses 500/1000. Radiosonde observations, as well as model analyses, do not show this phenomenon. The synoptic structure of the temperature field as well as the humidity field is comparable with all methods. Thus it can be concluded that there may be additional information in satellite derived atmospheric data, also on a scale at about meso-alpha/meso-beta. Statistics show that the structures of the fields are comparable at 98 - 99% correlation coefficient. This result can be improved by not using cloudy retrieval boxes. Collocations with radiosondes show a good agreement within the troposphere, thus a good simulation of stabilities can be expected by satellite data.

关键词： Satellites Clouds Statistical analysis Meteorological satellites Troposphere algorithm development Atmospheric sensing Geophysics Humidity Meteorology

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ESTIMATION OF AEROSOL OPTICAL DEPTH, PRESSURE ELEVATION, WATER-VAPOR AND CALCULATION OF APPARENT SURFACE REFLECTANCE FROM RADIANCE MEASURED BY THE AIRBORNE VISIBLE INFRARED IMAGING SPECTROMETER (AVIRIS) USING A RADIATIVE-TRANSFER CODE

ESTIMATION OF AEROSOL OPTICAL DEPTH, PRESSURE ELEVATION, WAT...

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Imaging Spectrometry of the Terrestrial Environment Conference

作者： GREEN, RO CONEL, JE ROBERTS, DA JET PROP LAB PASADENACA 91109

ISBN: (纸本)0819411736

The Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) is an imaging spectrometer that measures spatial images of the total up welling spectral radiance from 400 to 2500 nm at 10 nm spectral intervals. Quantitative research and application objectives for surface investigations require conversion of the measured radiance to surface reflectance or surface leaving radiance. To calculate apparent surface reflectance an estimation of aerosol optical depth is required for compensation of aerosol scattering and absorption across the spectral range. Determination of other atmospheric characteristics such as atmospheric water vapor and surface pressure is also required. In this paper we describe a set of algorithms to estimate aerosol optical depth, atmospheric water vapor, and surface pressure height from the AVIRIS measured radiance. Based upon these determined atmospheric parameters we described an algorithm to calculated apparent surface reflectance from the AVIRIS measured radiance using a radiative transfer code.

关键词： Reflectivity Atmospheric particles Aerosols Absorption Atmospheric modeling Atmospheric optics Radiative transfer algorithm development Scattering Spectroscopy

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