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

共 49 条记录，以下是11-20 订阅

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Liquid crystal display panel in an OPR system 9

Liquid crystal display panel in an OPR system

引用

conference on optical pattern recognition ix

作者： Liu, HS Wu, MX Jin, GF Cheng, G He, QS Tsing Hua Univ Dept Precis Instruments Beijing 100084 Peoples R China

ISBN: (纸本)0819428353

In this paper, we develop an optoelectronic pattern recognition system based on an incoherent optical correlator. The real-time input image is correlated with stored database images consecutively after several necessary preprocessing steps, and the recognition result is given quickly. The key device for the optical correlation is a SHARP QA-1200 8.4 " active matrix TFT liquid crystal display (LCD) panel which is used as two real-time spatial light modulators (SLMs) for both the input and the database image. Several practical difficulties when utilizing the LCD panel as an light intensity modulator have been overcome. Experimental results are given.

关键词： optical pattern recognition liquid crystal devices spatial light modulators TFT liquid crystal display (LCD) panel incoherent correlator

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optical metrology for industrialization of optical information processing 9

Optical metrology for industrialization of optical informati...

引用

conference on optical pattern recognition ix

作者： Casasent, D Wilson, CL Carnegie Mellon Univ Pittsburgh PA 15213 USA

ISBN: (纸本)0819428353

One of the major barriers to commercial application of optical technology to information processing is the high cost of system development and manufacture. This problem has been solved in other industries through the use of computer aided design (CAD) and integration of system design with manufacturing. The development of better system level metrology is needed to allow more computer-based methods to be used in this process. As a test case, we are designing an optical pattern recognition system to be performed on an input image (at video rates) versus a large reference set, for example 1000 faces, with images of 640 by 480 pixels or larger. We have constructed both an optical pattern recognition system and a holographic memory system which are have instrumented and used to address the metrological needs of these applications. This has allowed us to evaluate the level of system and component level metrology needed for real-time video processing. This report addressed the metrological issues encountered in building and testing these systems.

关键词： Spatial light modulators optical correlators optical storage Computer aided design Fourier transforms Modulation Image processing Charge-coupled devices Holography Optics manufacturing

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How to train a phase only filter

How to train a phase only filter

引用

conference on Advances in optical Information Processing ix

作者： Michel, HE Awwal, AAS Univ Massachusetts N Dartmouth MA 02747 USA

ISBN: (纸本)0819436720

This paper establishes the equivalence of the phase only filter and a complex-valued neural network, and then shows how neural network learning can be utilized to design completely novel phase-only-filter based system. By incorporating the neural network based learning, the pattern recognition capability of the phase only type of filter under various transformation and distortions can be enhanced.

关键词： phase-only fiber complex matched filter pattern recognition complex-valued artificial neural network neural network

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Cascaded linear shift invariant processing to improve discrimination and noise tolerance in optical pattern recognition 9

Cascaded linear shift invariant processing to improve discri...

引用

conference on optical pattern recognition ix

作者： Reed, S Coupland, J Loughborough Univ Technol Dept Mech Engn Loughborough LE11 3TU Leics England

ISBN: (纸本)0819428353

In this paper we report a study of optical pattern recognition using a cascade of linear shift invariant processing modules (correlators) each augmented with a thresholding layer. This configuration can be considered as a special class of multilayer feed-forward neural network. In contrast with more generalised multi-layer networks, the approach is easily implemented in practice using optical techniques and consequently well suited to the analysis of large images. The concept of cascaded linear shift invariant processing is introduced within the context of network analysis. It is shown that the system is equivalent to a multi-layer network which is constrained to have a shift invariant output. The system has been modelled using a modified back propagation algorithm with optimisation using simulated annealing techniques. The performance of the system has been compared to that of single layer correlators using a range of synthetic filters taken from the published literature. In particular we show that the noise tolerance of the cascaded system is increased relative to that of the minimum variance synthetic discriminant function (MVSDF). In addition we show that discrimination is enhanced considerably with respect to minimum average correlation energy (MACE) filters for the case of similar input images.

关键词： optical pattern recognition correlation neural networks

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Reliability of the calculation results in the optical-electronic holographic computing systems 9

Reliability of the calculation results in the optical-electr...

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conference on optical pattern recognition ix

作者： Perju, VL Perju, VV Tsiberneac, SK Saranciuc, DI Tech Univ Moldova Dept Comp Sci MD-2012 Kishinau Moldova

ISBN: (纸本)0819428353

The problems of investigation and calculations results reliability (CRR) evaluation in holographic computing systems are considered. The analysis of the existing approaches to estimation of CRR has been overtaken. A new method of CRR is proposed. The evaluation of CRR in the systems with single and coded correlation responses regarding processing of the images and the images Fourier spectrum has been performed. The simulation results are submitted.

关键词： holographic system calculation results reliability image identification

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An optical correlator for spectral pattern recognition 9

An optical correlator for spectral pattern recognition

引用

conference on optical pattern recognition ix

作者： Alcock, RD Halliwell, NA Coupland, JM Sutton, P Savage, J Loughborough Univ Technol Dept Mech Engn Loughborough LE11 3TU Leics England

ISBN: (纸本)0819428353

The rapid classification and discrimination of images using spatial distribution of spectral information has widespread applications from remote monitoring of vegetation and pollution damage, to military surveillance and anti-stealth warfare. This paper describes the construction of a practical optical correlator capable of spatial and spectral pattern recognition. The method used here exploits the ability of optical correlators to process information in parallel with high space bandwidth product. For reasons of light efficiency and practical convenience, the spectral information is input into the correlator as a spatial array of coherence or "white light" fringe patterns. This technique we have called coherence transform imaging (CTI). This paper discusses the relative merits of several interferometric methods to perform CTI including Michelson, Sagnac and Polarising interferometers. A robust CTI camera utilising a polarising interferometer is then described and simple matched filtering operations are performed using CTI images recorded on photographic film. Finally an optical correlator capable of real time spectral discrimination and tracking of coloured objects is demonstrated.

关键词： optical pattern recognition correlation coherence colour analysis

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Data flow architecture for high-speed optical processors 9

Data flow architecture for high-speed optical processors

引用

conference on optical pattern recognition ix

作者： Bauchert, KA Serati, SA Boulder Nonlinear Syst Inc Boulder CO 80301 USA

ISBN: (纸本)0819428353

For optical processor applications outside of laboratory experiments, it is desirable to streamline the data flow in order to obtain the highest possible throughput from the system. This paper presents the data flow architectures for two optical processors designed and built by Boulder Nonlinear Systems, as well as the processor designs and some experimental data.

关键词： spatial light modulators optical correlators liquid crystal displays manufacturing inspection optical processing multispectral analysis security monitoring machine vision data flow

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A smart Ho:YAG laser lithotriptor using optical correlation 9

A smart Ho:YAG laser lithotriptor using optical correlation

引用

conference on optical pattern recognition ix

作者： Kokaj, J Marafie, M Makdisi, Y Bhatia, K Mathew, KJ Caka, N Hasani, R Kuwait Univ Dept Phys Lab Laser Applicat Safat 13060 Kuwait

ISBN: (纸本)0819428353

Ultra fast imaging and destruction of the gall bladder stone is performed using Ho : YAG laser. A laser guided approach for lithotropsy is proposed. The correlation output peak is introduced as a feedback signal for firing the laser pulse for stone destruction and "discrimination" of the tissue image so that the risk of damaging and perforation of the tissue is reduced. A system constituted by correlation of ballistic images and fluorescent signals is proposed.

关键词： optical correlation

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Optimum filters, or are they? 9

Optimum filters, or are they?

引用

conference on optical pattern recognition ix

作者： Hartman, RL Farr, KB McColgan, MW Adv Opt Syst Inc Huntsville AL 35805 USA

ISBN: (纸本)0819428353

Optimum filters for optical correlators have been the topic of several papers in the last few years. How can there be more than one optimum? Because, different approaches optimize different functions. Most research to date has optimized some internal working function of the correlator, such as optical efficiency, or narrowness of the correlation peak. However, in the real world, there is usually some application oriented function to optimize. For example, in a tracking system, the robustness to break-lock may be the most critical function. There is a threshold in the signal to noise required for single pixel tracking. Beyond that, "optimization power" might better be spent on increasing tolerance to aspect change, rather than increasing signal to noise. This paper will discuss the attention the filter designer must pay to bore slope error, tolerances for distortions, signal to noise, correlation width, transport delay, and other variables.

关键词： optical processing correlation recognition filter tracking

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Fourier plane detectors for optical image processing 9

Fourier plane detectors for optical image processing

引用

conference on optical pattern recognition ix

作者： Farr, KB Hartman, RL Adv Opt Syst Inc Huntsville AL 35805 USA

ISBN: (纸本)0819428353

Two specialized silicon photo-diode detector arrays and supporting electronics have been developed for use in the Fourier plane of a coherent optical image processor. Each detector array has geometrical characteristics tailored for extraction of specific image features. The first detector performs angular measurement of in-plane rotation of simple objects to an accuracy of better than one degree. This detector is being integrated into a system to measure the attitude of missiles in flight. The second detector uses the well-known ring-wedge geometry to measure edge angles and power spectra in the Fourier plane. This detector and supporting neural network software forms a powerful automatic target recognition system. Both detectors are capable of processing images at rates exceeding one thousand frames per second. We describe systems that process NTSC or VGA video images at 60 frames per second.

关键词： optical processing ring-wedge neural network automatic target recognition Fourier transform

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