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检索条件"任意字段=Conference on Optical Pattern Recognition XII"

共 43 条记录，以下是21-30 订阅

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Grayscale optical correlator for real-time onboard ATR

Grayscale optical correlator for real-time onboard ATR

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conference on optical pattern recognition xii

作者： Chao, TH Zhou, HY Reyes, G CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819440825

Jet Propulsion Laboratory (JPL) has been developing grayscale optical correlator (GOC) for a variety of automatic target recognition (ATR) applications [1-5]. As reported in previous papers, a 128 x 128 camcorder-sized GOC [1-3] has been demonstrated for real-time field ATR demos. In this paper, we will report the recent development of a prototype 512 x 512 GOC utilizing a new miniature ferroelectric liquid crystal spatial light modulator (FLCSLM) with a 7-mum pixel pitch. Experimental demonstration of ATR applications using this new GOC will be presented. The potential of developing a matchbox-sized GOC will also be discussed. A new application of synthesizing new complex-valued correlation filters using this real-axis 512 x 512 SLM will also be included.

关键词： grayscale optical correlator automatic target recognition optical MACH correlation filter miniature packaging

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SLM operating curves for statistical pattern recognition metrics

SLM operating curves for statistical pattern recognition met...

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conference on optical pattern recognition xii

作者： Juday, RD Rollins, JM Monroe, SE NASA Lyndon B Johnson Space Ctr Houston TX 77058 USA

ISBN: (纸本)0819440825

We show how the signal to noise ratio distributes ideally in the complex plane of filter values, and we show how it is captured in its representation on the restricted set of values the filter SLM is able to realize. The ability to take strong advantage of a large dynamic range of filter magnitude is apparent. Further work will extend this concept to other metrics of optical correlator performance, including statistical pattern recognition (PR) criterion functions such as Bayes' error, ROC (receiver operating characteristic) curve's area, and Fisher ratio.

关键词： optical correlator optimal filters optical pattern recognition

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Dynamic spot pattern projection to detect and track object motion

Dynamic spot pattern projection to detect and track object m...

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conference on optical pattern recognition xii

作者： Hassebrook, LG Cohn, RW Univ Kentucky Dept EE Lexington KY 40506 USA

ISBN: (纸本)0819440825

A spatial light modulator can be used to actively illuminate moving objects with spot patterns. This research studies the spot patterns designed to detect and track object motion. To enhance the detection and tracking process, a system supervisor dynamically updates each successive spot pattern. The spot patterns are implemented by pseudo-randomly encoding their frequency plane into a phase-only filter to be implemented on a 128x128 Boulder Nonlinear System's LCD device. The modification of the spot patterns are based on the change of reflected intensity from one frame to the next. Detection, tracking, encoding and supervisor design and methodology are presented.

关键词： Sensors Detection and tracking algorithms Signal to noise ratio Computer programming Spatial light modulators Phase only filters System integration Complex systems Image enhancement Lithium

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Real-time holographic implementation of optimal correlation algorithms

Real-time holographic implementation of optimal correlation ...

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conference on optical pattern recognition xii

作者： Khoury, J Gianino, PD Woods, CL USAF Res Lab SNHC Hanscom AFB MA 01731 USA

ISBN: (纸本)0819440825

In this paper we theoretically analyze and demonstrate that a photorefractive correlator, originally proposed by D.M. Pepper and later implemented by J.O. White and A. Yariv as well as many others, can be used to realize adaptively a wide variety of optimal correlation filters such as the matched filter, the inverse correlation filter, the maximum discrimination correlation filter and several trade-off correlation filters.

关键词： pattern recognition correlators optical filters optical processing photorefractivity

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Compact optical correlator based helmet-tracking system

Compact optical correlator based helmet-tracking system

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conference on optical pattern recognition xii

作者： New, NJ Wilkinson, TD Univ Cambridge Dept Engn Photon & Sensors Grp Cambridge CB2 1PZ England

ISBN: (纸本)0819440825

We present a high-speed compact Binary Phase Joint Transform Correlator (BPJTC) system based on a single liquid crystal over silicon spatial light modulator. The system is capable of processing images of 320*120 pixel resolution at frame rates currently Limited to around 40 frames per second by the choice of camera within the system The system is presented in the context of an image comparator system in a fighter aircraft cockpit, which is used to track the view of the pilot. This is achieved by using a helmet-mounted camera to provide the input scenes and some of the inherent properties of the Joint Transform Correlator (JTC). Results from an experimental prototype are presented.

关键词： compact Binary Phase Joint Transform Correlator helmet tracker image comparator

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optical implementation of a snake-based segmentation with an incoherent correlator

Optical implementation of a snake-based segmentation with an...

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conference on optical pattern recognition xii

作者： Hueber, E Bigué, L Réfrégier, P Ambs, P Univ Haute Alsace Lab MIPS Mulhouse France

ISBN: (纸本)0819440825

This paper presents an incoherent optoelectronic processor which is able to segment an object in a real image. The process, based on active contours (snakes), consists in correlating adaptive binary references with the scene image or with a preprocessed version of the scene image. The proposed optical implementation of algorithms which are already operational numerically opens attractive perspectives as far as speed is concerned. Furthermore, this experiment is a new application for optical processors.

关键词： image segmentation incoherent optical correlation active contours snakes

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Fully complex filter implementation in all-optical and hybrid digital/optical correlators

Fully complex filter implementation in all-optical and hybri...

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conference on optical pattern recognition xii

作者： Birch, P Young, R Claret-Tournier, F Koukoulas, T Tan, S Budgett, D Chatwin, C Univ Sussex Sch Engn & Informat Technol Laser & Photon Syst Res Grp Brighton BN1 9QT E Sussex England

ISBN: (纸本)0819440825

A technique for the experimental implementation of fully complex filters with commercially available spatial light modulators (SLMs) is reported. The filters are incorporated into an all-optical correlator and a hybrid digital-optical correlator, the relative merits of each configuration being considered. Various filter functions requiring complex modulation are demonstrated, consideration being given to the degradation of filter performance due to the limited quantisation and dynamic range with which they can be implemented using current SLM technology.

关键词： fully complex filters spatial light modulators digital correlators optical correlators pattern recognition

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optical techniques for three-dimensional image recognition

Optical techniques for three-dimensional image recognition

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conference on optical pattern recognition xii

作者： Tajahuerce, E Matoba, O Javidi, B Univ Jaume 1 Dept Ciencies Expt Castellon de La Plana 12080 Spain

ISBN: (纸本)0819440825

We describe several optoelectronic methods based in digital holography for recognition of three-dimensional (3D) images. The phase and amplitude of a Fresnel diffraction pattern of a 3D reference object is measured with digital holography. This complex information is compared with that coming from a similar digital hologram of a 3D input scene using correlation techniques. In this way, the method allows us to detect the presence of the 3D reference object in the 3D input scene with high discrimination. pattern recognition techniques that are shift-variant or shift-invariant along the optical axis are described. In the later case it is possible to detect the 3D position of the reference in the input scene with high accuracy. Using the information contained in the digital holograms it is also possible to measure small 3D orientation changes of a 3D object. Experimental results are presented.

关键词： three-dimensional image processing three-dimensional patter recognition three-dimensional imaging digital holography

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Comparison of computed and laboratory results for SNR and arbitrary SLMs

Comparison of computed and laboratory results for SNR and ar...

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conference on optical pattern recognition xii

作者： Rollins, JM Monroe, SE Juday, RD Hernandez Engn Houston TX 77062 USA

ISBN: (纸本)0819440825

We show that certain additions to the mathematical model of a correlator can improve the signal to noise ratio (SNR) of the optical correlator itself. All computational optimizations include a digital simulation process as a critical tool. The more accurate the model of the optical correlator, the better the optimization. Improvements to our correlator model, based on correlator measurements, are made to the simulator in our filter optimization process. Comparisons of the signal to noise ratio are made both digitally and optically. Laboratory results are given.

关键词： optical Correlator simulator filter optimization scatter SNR PSF

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optical electronic computer systems design in stationary and dynamic modes

Optical electronic computer systems design in stationary and...

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conference on optical pattern recognition xii

作者： Perju, VL Tech Univ Moldova MD-2012 Chisinau Moldova

ISBN: (纸本)0819440825

The theory of designing the optical-electronic image processing computer systems has been presented. A model of parallel image processing system has been considered, that is based on the principle of function decomposition. The implementation possibilities of different image processing operations with the help of optical and electronic computer means have been analyzed. A structure model of computer system has been examined, that is a conveyor of parallel computer devices. The evaluation of time outlay in the system, while processing an image or a series of them has been made. The differences of time outlay from conveyor length change and the correlation of optical and electronic devices and processing time in them have been exposed. The designing method of image processing systems in static mode has been elaborated. There are presented the results of investigations of the influence of the median square deviation, the influence of time of the processing in the modules on the throughput capacity of the system under the different electronic and optical modules quantity. According to the results of investigations the recommendations of increasing the system's throughput the capacity are formulated. On the basis to these recommendations, the system design method of image processing in the dynamic mode is elaborated.

关键词： computer system model conveyor optical electronic

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