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检索条件"主题词=Detection and tracking algorithms"

共 1721 条记录，以下是1421-1430 订阅

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MORPHOLOGY-BASED algorithms FOR TARGET detection SEGMENTATION IN FLIR IMAGERY

MORPHOLOGY-BASED ALGORITHMS FOR TARGET DETECTION SEGMENTATIO...

引用

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

作者： PELI, T VINCENT, L TOM, V Atlantic Aerospace Electronics Corp. (United States)

ISBN: (纸本)0819411930

This paper describes a morphology-based hierarchical process for the detection and segmentation of low and high contrast targets in second generation FLIR imagery. The computational framework is based on the application of simple non-linear binary and grayscale operations that lead to real-time implementations. The process consists of two major processing steps: target-cueing/coarse-segmentation and contour refinement. Our multi-stage detection/segmentation process was applied to both real and simulated FLIR imagery. Preliminary results indicate that the developed morphology-based detector exhibits excellent detection performance for both low and high contrast targets in complex backgrounds while maintaining a low false alarm rate. Contour refinement is based on the watershed transform that is applied in a hierarchical fashion. In addition, our segmenter extracted accurate target outlines under poor conditions in which edge-based techniques or traditional watershed algorithms would have failed.

关键词： Image segmentation Target detection Image processing detection and tracking algorithms Forward looking infrared Binary data Image filtering Sensors Signal processing Computer simulations

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TIME-RESOLVED IMAGING IN DENSE SCATTERING MEDIA

TIME-RESOLVED IMAGING IN DENSE SCATTERING MEDIA

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CONF ON PHYSIOLOGICAL IMAGING, SPECTROSCOPY, AND EARLY-detection DIAGNOSTIC METHODS

作者： CHANG, JH WANG, Y ARONSON, R GRABER, HL BARBOUR, RL DAS, B DOLNE, J YOO, KM ALFANO, RR Polytechnic Univ. (United States) SUNY/Brooklyn Health Science Ctr. (United States) CUNY/City College (United States)

ISBN: (纸本)0819411140

The ability to image at optical frequencies objects embedded in a dense scattering medium has been experimentally evaluated using a previously described Progressive Expansion (PE) algorithm. Optical backscatter measurements were performed in a limited raster-type scan using a colliding pulse modelocked (CPM) femtosecond laser operating at 620 nm and streak camera. Data were collected in the presence and absence of the embedded absorber (3 mm diameter bead) located at a depth not visible from the surface, smoothed and evaluated between - - 200 ps in steps of 36 ps, using an overlapping approach contained in the PE algorithm, which is based on a linear perturbation model. Results obtained demonstrate the sensitivity of reconstructed images to variations in source and detector locations in relation to the subsurface location of the absorber.

关键词： Sensors Photons Signal detection Reconstruction algorithms Absorption Image restoration Picosecond phenomena Scattering Image quality standards detection and tracking algorithms

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PATTERN-RECOGNITION BASED ON MORPHOLOGICAL TRANSFORMATIONS AND ITS OPTICAL IMPLEMENTATION

PATTERN-RECOGNITION BASED ON MORPHOLOGICAL TRANSFORMATIONS A...

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CONF ON OPTICS, ILLUMINATION, AND IMAGE SENSING FOR MACHINE VISION 7

作者： YUAN, SF CHEN, LX HONG, J Harbin Institute of Technology (China)

An improved pattern recognition method based on morphological transformations is described and simulation results are presented. An incoherent optical morphological transformation processor is used to implement this k... 详细信息

ISBN: (纸本)0819410233

关键词： Binary data Optical pattern recognition Pattern recognition Image processing CRTs Frame grabbers Distortion Applied physics detection and tracking algorithms Optical components

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EXTENDED TARGET tracking IN FLIR IMAGE SEQUENCES

EXTENDED TARGET TRACKING IN FLIR IMAGE SEQUENCES

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

作者： SAMY, R DUCLOS, D Societe Anonyme de Telecommunications (France)

ISBN: (纸本)0819411930

Passive navigation and automatic guidance using JR image irradiance tracking present a new challenge to computer vision due to a wide variety of 3D structural discontinuities and occlusions occuring in real-world scenario [1], [2], [3]. Time-varying images of real-world scenes can provide kinematical, dynamical and structural information of the world. To estimate from the image sequences, the 3D motion and structure of objects it is often necessary to establish correspondences between images. Establishing correspondences between different perspective images of the same scene is one of the most challenging and critical step in motion and scene analysis. Several approaches to the passive navigation problem have been suggested in recent literature [4]. Approaches for passive navigation using stereo image Pairs have also been reported. rllhis paper describe an image matching approach based on multiple attributes extracted from each image provide by an airborne FUR.

关键词： Image fusion Feature extraction Motion estimation Computer vision technology detection and tracking algorithms Forward looking infrared Image processing Machine vision Missiles Navigation systems

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OFF-LINE AND ONLINE BACK-PROPAGATION METHODS WITH VARIOUS LEVELS OF REDUNDANCY 2

OFF-LINE AND ONLINE BACK-PROPAGATION METHODS WITH VARIOUS LE...

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CONF ON SCIENCE OF ARTIFICIAL NEURAL NETWORKS 2

作者： DIMEDIO, A FANELLI, S PROTASI, M Univ. of Rome

ISBN: (纸本)0819412023

The performance of Back Propagation methods strongly depend on the following two choices: (1) use of off-line or on-line algorithm; (2) level of redundancy of the training set of data. Past investigations studied respectively off-line algorithms with a low degree of redundancy and on- line algorithms with a high degree of redundancy. In this paper we complete the framework considering on-line algorithms with a low level of information and off-line algorithms using training sets with 'redundancy of target data'.

关键词： detection and tracking algorithms Evolutionary algorithms Information operations Neural networks Artificial neural networks Data modeling Mathematical modeling Neurons Reliability Stochastic processes

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tracking IN A HIGH CLUTTER ENVIRONMENT - SIMULATION RESULTS CHARACTERIZING A BI-LEVEL MHT ALGORITHM

TRACKING IN A HIGH CLUTTER ENVIRONMENT - SIMULATION RESULTS ...

引用

5TH CONF ON SIGNAL AND DATA PROCESSING OF SMALL TARGETS

作者： CHAN, DSK HARRISON, DD LANGAN, DA GE Corporate Research and Development Ctr. (United States)

ISBN: (纸本)0819411906

As detection processing becomes increasingly advanced, for example, in infrared search and track (IRST) systems, the detection threshold becomes the bottleneck to overall system performance. Significantly reducing this threshold requires the capability to track targets in a high clutter environment. In theory, the multiple hypothesis tracking (MHT) algorithm is a solution to this problem. However, in practice, MHT in its basic form becomes computationally prohibitive for all but low to moderate false alarm densities. In this paper, we evaluate a computationally feasible alternate form, which we call a bi-level MHT algorithm. The basic form of this algorithm has been previously proposed, but results on its performance have been lacking. In addition to describing an implementation of a bi-level MHT algorithm, this paper present Monte Carlo simulation results characterizing the performance of the algorithm, and demonstrates the tradeoff between track acquisition range and false track rate for a simple IRST fly-by scenario.

关键词： detection and tracking algorithms Target detection Monte Carlo methods Signal to noise ratio Infrared search and track Computer simulations Filtering (signal processing) Palladium Electronic filtering algorithms

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OPTOELECTRONIC IMAGE-PROCESSORS

OPTOELECTRONIC IMAGE-PROCESSORS

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4TH ANNUAL CONF ON OPTICAL PATTERN RECOGNITION

作者： GIBIN, IS Siberian Optical Systems Research Institute (Russia)

ISBN: (纸本)0819411957

Some hybrid (analogue—digital) optoelectronic image processing system are considerecL Optical correlation processors with the pro— grammable trans-Formation core forming are proposed. Optical processor operation in the matrix—vector multiplication mode is discussed. A comparision analysis of optical image processors and digital universal and matrix calculators is carried outS.

关键词： Image processing Digital image processing Optoelectronics Computing systems Image analysis Optical pattern recognition Digital image correlation Image filtering Modulators detection and tracking algorithms

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GENERATING OBJECT LOCATORS FROM A TRAINING ENSEMBLE 2

GENERATING OBJECT LOCATORS FROM A TRAINING ENSEMBLE

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2ND INTERNATIONAL CONF ON ADAPTIVE LEARNING SYSTEMS

作者： SHER, DB PODNOS, EH SUNY/Buffalo (United States)

ISBN: (纸本)0819411981

We discuss and present preliminary results about an algorithm which is trained to locate objects in images. The algorithm determines the parameters for a generalized Hough transform based on training images. Our training images consist of binary edge images from noisy imagery and identified points and boundaries for the objects being located in this imagery. The resulting generalized Hough transform will find objects of the same type at a wide variety of scales and any orientation present in the training data.

关键词： Hough transforms Binary data Algorithm development detection and tracking algorithms Neural networks Data modeling Object recognition Sensors Visualization Computer science

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EXTRACTION OF EDGE-BASED AND REGION-BASED FEATURES FOR OBJECT RECOGNITION 12

EXTRACTION OF EDGE-BASED AND REGION-BASED FEATURES FOR OBJEC...

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12th Conference on Intelligent Robots and Computer Vision: algorithms and Techniques

作者： COUTTS, B RAVI, S HU, GZ SHRIKHANDE, N CENT MICHIGAN UNIV DEPT COMP SCIMT PLEASANTMI 48858

ISBN: (纸本)0819413208

One of the central problems of computer vision is object recognition. A catalogue of model objects is described as a set of features such as edges and surfaces. The same features are extracted from the scene and matched against the models for object recognition. Edges and surfaces extracted from the scenes are often noisy and imperfect. In this paper algorithms are described for improving low level edge and surface features. Existing edge extraction algorithms are applied to the intensity image to obtain edge features. Initial edges are traced by following directions of the current contour. These are improved by using corresponding depth and intensity information for decision making at branch points. Surface fitting routines are applied to the range image to obtain planar surface patches. An algorithm of region growing is developed that starts with a coarse segmentation and uses quadric surface fitting to iteratively merge adjacent regions into quadric surfaces based on approximate orthogonal distance regression. Surface information obtained is returned to the edge extraction routine to detect and remove fake edges. This process repeats until no more merging or edge improvement can take place. Both synthetic (with Gaussian noise) and real images containing multiple object scenes have been tested using the merging criteria. Results appeared quite encouraging.

关键词： Edge detection Object recognition Image segmentation Algorithm development Feature extraction detection and tracking algorithms Image processing algorithms and systems Computer vision technology Machine vision Visual process modeling

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BEYOND FRINGE ANALYSIS 6

BEYOND FRINGE ANALYSIS

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Conference on Interferometry VI: Techniques and Analysis

作者： SHOUGH, D LOCKHEED PALO ALTOCA 94304

ISBN: (纸本)081941252X

Fringe analysis has progressed from classical fringe-following techniques to modern phase- shifting interferometry (PSI). Recent efforts have extended PSI to more difficult situations, including transient, complex wave fronts. This paper discusses the pros and cons of various PSI techniques and shows examples of the capabilities of spatial phase-shifting interferometry.

关键词： Wavefronts Phase shifts Interferometry Phase interferometry Fringe analysis Interferometers Cameras Phase shift keying Optical filters detection and tracking algorithms

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