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

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AUTOMATIC SHAPE-RECOGNITION OF HUMAN LIMBS TO AVOID ERRORS DUE TO SKIN MARKER SHIFTING IN MOTION ANALYSIS 14

AUTOMATIC SHAPE-RECOGNITION OF HUMAN LIMBS TO AVOID ERRORS D...

引用

CONF ON APPLICATIONS OF DIGITAL IMAGE PROCESSING 14

作者： HATZE, H BACA, A Univ. of Vienna (Austria)

ISBN: (纸本)0819406953

A new method in human motion analysis is presented for overcoming the problem of the shifting of skin-mounted position markers relative to the skeleton. The present version of the method is based on two-dimensional video processing and involves the recording of subjects wearing special clothing. The clothing is designed in such a way as to permit the unambiguous spatial shape recognition of each of the 17 body segments by means of an edge detection algorithm. The latter and the algorithms for the computation of segment translation and rotation constitute improved versions of previously used algorithms, especially with respect to the execution times of the respective computer program on ordinary PCs. From the recognized shapes, the translation and rotation of each segment relative to its initial configuration is computed by using positional information from the previous frames. For the first frame to be analyzed, a starting algorithm has to be applied. Finally, the configurational coordinates of the body model are calculated from the respective spatial linear and angular positions.

关键词： Image processing Digital image processing detection and tracking algorithms Motion analysis Chemical elements Edge detection Skin Software Video processing Error analysis

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MACHINE VERIFICATION OF TRACED SIGNATURES

MACHINE VERIFICATION OF TRACED SIGNATURES

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CONF ON APPLICATIONS OF ARTIFICIAL INTELLIGENCE 9

作者： KRISHNAN, G JONES, D Stetson Univ. (United States)

ISBN: (纸本)0819405779

The handwritten signature is the most widely employed source of secure identification in the United States, especially for cashing checks, and verifying credit card transactions. Currently, all signature verification is based on visual inspection by a teller or a store clerk. Previous successful techniques for forgery detection have primarily been on-line techniques. This research is an extension of the first author's work on forgery detection and describes an algorithm to detect forgeries perpetrated by using a tracing paper or a glass plate. This algorithm is very successful when used in conjunction with the algorithm developed earlier by the first author.

关键词： Evolutionary algorithms detection and tracking algorithms Algorithm development Glasses Artificial intelligence Optical inspection Patents Sensors Visualization Mathematics

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ACQUISITION AND tracking PERFORMANCE-MEASUREMENTS FOR A HIGH-SPEED AREA ARRAY DETECTOR SYSTEM

ACQUISITION AND TRACKING PERFORMANCE-MEASUREMENTS FOR A HIGH...

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CONF ON FREE-SPACE LASER COMMUNICATION TECHNOLOGIES

作者： SHORT, RC COSGROVE, M CLARK, DL MARTINO, A PARK, H SEERY, B Eastman Kodak Co. (United States) NASA/Goddard Space Flight Ctr. (United States)

ISBN: (纸本)0819405078

A proof-of-concept (POC) demonstration system has been developed which demonstrates acquisition, tracking and point-ahead angle sensing for a space optical communications terminal utilizing a single high speed area array detector. The detector is the 128 x 128 pixel Kodak HS-40 photodiode array. It has 64 parallel readout channels and can operate at frames rates up to 40,000 frames/sec with rms readout noise of 20 photoelectrons. A windowing scheme and special purpose digital signal processing electronics are employed to implement acquisition and tracking algorithms. The system operates at greater than 1 kHz sample (frame) rates. Acquisition can be performed in as little as 30 milliseconds with less than 1 picowatt of 0.85 micron beacon power on the detector. At the same power level, the rms tracking accuracy is approximately 1/16 pixel. Results of system analysis and measurements using the POC system are presented.

关键词： Sensors Point spread functions detection and tracking algorithms Calibration Signal to noise ratio Detector arrays Digital signal processing Telecommunications Free space optical communications Laser applications

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CONTEXT SPECIFICATION FOR TEXT RECOGNITION IN FORMS

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CONF ON HIGH-SPEED INSPECTION ARCHITECTURES, BARCODING, AND CHARACTER RECOGNITION

作者： ANDERSON, K BARRETT, W Brigham Young Univ. (United States)

ISBN: (纸本)0819404519

The use of contextual information has been shown to improve the accuracy of text recognition. Methods for describing the graphical and textual contexts inherent in forms are presented. Graphical context derived from an empty form is used for improved segmentation. Since fields on forms often have a very limited number of acceptable responses (ie. sex marital status etc. ) context is also used to limit the scope of the classifier based on field type location or content. Fields on forms also exhibit known spatial interrelationships as well as contextual inter-dependencies which provide a natural set of mutual constraints for field-specific classifiers.

关键词： Associative arrays Databases Optical character recognition detection and tracking algorithms Image segmentation Legal Scanners Algorithm development Image quality Inspection

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LAUNCH AREA THEODOLITE SYSTEM 5

LAUNCH AREA THEODOLITE SYSTEM

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CONF ON ACQUISITION, tracking, AND POINTING 5

作者： BRADLEY, LM CORRIVEAU, JP TINDAL, NE U.S. Army/White Sands Missile Range (United States)

ISBN: (纸本)0819405914

White Sands Missile Range has developed a Launch Area Theodolite (LAT) optical tracking system that provides improved Time-Space-Position-Information (TSPI) for the new class of hyper-velocity missiles being developed by the Army. The LAT system consists of a high- performance optical tracking mount equipped with an 8-12 micrometers Forward Looking Infrared (FLIR) sensor, a newly designed full-frame pin-registered 35-mm film camera, and an auto- focused 50-in. focal length lens. The FLIR has been integrated with the WSMR in-house developed statistical based automatic video tracker to yield a powerful system for the automatic tracking of missiles from a short standoff distance. The LAT has been designed to replace large fixed-camera arrays for test programs on short-range anti-tank missiles. New tracking techniques have been developed to deal with angular tracking rates that exceed one radian in both velocity and acceleration. Special techniques have been developed to shock the tracking mount at the missile launch to match the target motion. An adaptive servo control technique allows a Type III servo to be used to compensate for the high angular accelerations that are generated by the placement of the LAT mounts along the missile flight path. An automated mode selection adjustment is employed as the missile passes a point perpendicular to the tracking mount to compensate for the requirement to rapidly decelerate the tracking mount and keep the target in the field-of-view of the data camera. This paper covers the design concept for a network of eight LAT mounts, the techniques of automatic video tracking using a FLIR sensor, and the architecture of the servo control algorithms that have allowed the LAT system to produce results to a degree never before achieved at White Sands Missile Range.

关键词： Missiles Servomechanisms Cameras detection and tracking algorithms Control systems Video Forward looking infrared Optical tracking Automatic tracking Imaging systems

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IMAGING AUTOTRACKER TECHNOLOGY FOR GUIDED MISSILE SYSTEMS 5

IMAGING AUTOTRACKER TECHNOLOGY FOR GUIDED MISSILE SYSTEMS

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CONF ON ACQUISITION, tracking, AND POINTING 5

作者： HAMMON, RK HELTON, MK U.S. Army Missile Command (United States)

ISBN: (纸本)0819405914

Imaging autotracker technology is an area vital to numerous current and future Army programs. As advancements in infrared detector technology provide sensors with higher resolution and increased sensitivity, parallel advancements in target tracker technology will be required in order to achieve full benefit from these new generation devices. Key technical areas being researched include algorithms for terminal aim point selection, automatic reacquisition of low signature targets in high clutter, and continuous tracking of intermittently or partially obscured targets in dirty battlefield conditions. Research on improved tracking processors and devices for real-time algorithm implementation is being done in conjunction with the algorithm studies. This paper presents an overview of this work with particular emphasis on terminal homing autotracker technology.

关键词： Missiles detection and tracking algorithms Target acquisition Imaging systems Video Automatic tracking Automatic target recognition Optical correlators Video processing Sensors

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SURVEY - OMNIFONT PRINTED CHARACTER-RECOGNITION

SURVEY - OMNIFONT PRINTED CHARACTER-RECOGNITION

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CONF ON VISUAL COMMUNICATIONS AND IMAGE PROCESSING : IMAGE PROCESSING

作者： TIAN, Q ZHANG, P ALEXANDER, T KIM, Y Univ. of Washington (United States)

ISBN: (纸本)0819407437

This paper presents an overview of methods for recognition of omnifont printed Roman alphabet characters with various fonts, sizes and formats (plain, bold, etc.) from OCR system perspectives. First, it summarizes the current needs for optical printed character recognition (OPCR) in general, and then describes its importance for conversion between paper and electronic media. Current status of commercially available software and products for OPCR are briefly reviewed. Analysis indicates that the challenge we face in OPCR is far from being solved, and there is still a great gap between human needs and machine reading capabilities. Second, OPCR systems and algorithms are briefly reviewed and compared from the context of digital document processing for the following four stages: preprocessing of images, segmentation, recognition, and post-processing. Finally, possible research directions to improve the performance of OPCR systems are suggested, such as using an approach based on the combination of template matching and varieties of feature-based algorithms to recognize isolated characters, the use of multilayered architectures for OPCR, and parallel processing- based high-performance architectures.

关键词： Image segmentation Optical character recognition Image processing detection and tracking algorithms Neural networks Computing systems Feature extraction Visual communications Visualization Multilayers

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detection OF SURFACE-LAID MINEFIELDS USING A HIERARCHICAL IMAGE-PROCESSING ALGORITHM 14

DETECTION OF SURFACE-LAID MINEFIELDS USING A HIERARCHICAL IM...

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CONF ON APPLICATIONS OF DIGITAL IMAGE PROCESSING 14

作者： MCFEE, JE RUSSELL, KL ITO, MR Defence Research Establishment Suffield (Canada) Univ. of British Columbia (Canada)

ISBN: (纸本)0819406953

The remote detection of minefields has a high priority with the armed forces of several countries, including Canada. The Defence Research Establishment Suffield and the University of British Columbia are jointly developing methods to identify surface-laid minefields by real- time analysis of airborne sensor imagery. Passive multispectral imaging has been investigated, but the problem of analyzing monochromatic images from active infrared scanners is considered here. Among the severe constraints are that one must find clusters of bright regions each only several pixels wide, sparsely distributed over large areas. Also, the sharply forward peaked scattering from the mines and variable terrain roughness leads to the result that some mines are not detected. The required very high input data rate suggests simple, high speed target cuing which is amenable to hardware implementation. This is incompatible with slower image understanding techniques needed to identify mines by their shapes, and minefields by the spatial relationships between mines. A hierarchical algorithm is thus presented as a solution to the problem. In progressing from lower to higher levels, computational operations become more complex and less able to be implemented on conventional high-speed devices but the volume of data to be analyzed decreases. At the lowest level, non-suspect regions are rejected to drastically reduce the data rate. At the next higher level, suspect regions are segmented into homogeneous sub-regions. The next level consists of extraction of morphological features of the sub-regions. One level higher, sub-regions are classified based on extracted features. At the top level, spatial relationships between `mine-like' regions are determined and are used by knowledge-based methods to classify the imaged area as being a minefield with a specified likelihood. The algorithm, which includes a novel region segmenter, has been developed up to and including sub-region classification. Studies u

关键词： Land mines detection and tracking algorithms Mining Algorithm development Sensors Analytical research Image segmentation Image analysis Feature extraction Imaging systems

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NEW CONCEPTS IN MATHEMATICAL MORPHOLOGY - THE TOPOGRAPHICAL AND DIFFERENTIAL DISTANCE FUNCTIONS

NEW CONCEPTS IN MATHEMATICAL MORPHOLOGY - THE TOPOGRAPHICAL ...

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CONF ON IMAGE ALGEBRA AND MORPHOLOGICAL IMAGE PROCESSING 2

作者： PRETEUX, F MERLET, N Telecom Paris (France)

ISBN: (纸本)0819406961

If the concept of Euclidean and geodesic distance is of great importance in binary mathematical morphology (MM), the grey-level MM deals mainly with neighborhood configuration analysis. This paper presents a novel approach to grey-level MM based on the concept of the distance function relative to topographical surfaces. By introducing the notions of connection cost and deviation cost, we define the topographical and differential distances and develop a powerful theoretical framework for establishing the equivalence between the two fundamental notions of skeleton by influence zones and watershed: the SKIZ of the set of the minima of a grey-level image f with respect to the differential distance function is exactly the watershed of f. This leads to a duality between binary and grey-level images as well as new fast algorithms for computing the SKIZ and the watershed.

关键词： Binary data Image processing Information operations Algorithm development Image segmentation Mathematical morphology Image analysis Silicon detection and tracking algorithms Tin

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OPTICAL-FLOW TECHNIQUES FOR MOVING TARGET detection

OPTICAL-FLOW TECHNIQUES FOR MOVING TARGET DETECTION

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CONF ON SENSOR FUSION 3 : 3-D PERCEPTION AND RECOGNITION

作者： RUSSO, P MARKANDEY, V BUI, T SHRODE, D Texas Instruments Inc. (United States)

We present an evaluation of several pixel level optical flow techniques, for flow computation accuracy. Flow accuracy is characterized with respect to spatio-temporal image characteristics relevant to moving target de... 详细信息

ISBN: (纸本)0819404500

关键词： Optical flow Target detection Sensors detection and tracking algorithms Image fusion Edge detection Sensor fusion Image resolution Image sensors Image processing

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