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检索条件"任意字段=Conference on Algorithms, Devices, and Systems for Optical Information Processing III"

共 250 条记录，以下是171-180 订阅

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optical correlation and convolution of real 2-D inputs and real 2-D filters

Optical correlation and convolution of real 2-D inputs and r...

引用

Proceedings of the 1999 algorithms, devices, and systems for optical information processing iii

作者： McAulay, Alastair D. Lehigh Univ Bethlehem United States

Frequently in character recognition, there is a need to correlate or convolve purely real 2-D inputs and real 2-D filters. We propose two optical correlators. The first, basic real-input-real-filter optical correlator, adds x and y mirror images adjacent to the image to generate real and even images. This avoids the need for an offset reference to capture phase. Therefore, we have greater diffraction efficiency and a reduction in filter LCD pixel size. The second, Hilbert transform basic real-input-real-filter optical correlator, uses a Hilbert transform by masking in the filter plane to reduce the number elements in the filter LCD to that of the number of pixels in a filter image. An optical system can generate the mirror images in real time so that both the input LCD and the filter LCD can have only the same number of elements as their respective number of image pixels. We show how a spatial filter can be used to remove the intensity offset produced in the Hilbert transform and restore shift invariance if required. Finally, if desired, some rotation invariance can be achieved by overlapping the mirror images with the basic correlator. Advantages and disadvantages of the proposed correlators are discussed.

关键词： optical character recognition

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Adapting the input scene and the filter to the operating curves of the modulators in real time correlators

Adapting the input scene and the filter to the operating cur...

引用

Proceedings of the 1999 algorithms, devices, and systems for optical information processing iii

作者： Campos, J. Yzuel, M.J. Moreno, I. Ahouzi, E. Marquez, A. Lopez-Coronado, O. Attaleb, A. Universidad Autonoma de Barcelona Bellaterra Spain

In this paper we present some results on the research line of real-time correlation applied to optical pattern recognition. We present a real time optical correlator that uses two twisted nematic liquid crystal spatial light modulators (SLM). This kind of SLM produces phase and amplitude coupled modulation. Phase modulation is useful for the implementation of phase only filters (POF), but the coupled amplitude modulation affects its performance. We present a model to evaluate the response of the phase-only filter (POF) implemented on a modulator with a restricted modulation and we show results on the optimal implementation of POF on this restricted coding domain. The phase modulation is also used for the implementation of the scene by means of phase-encoding algorithm. The performance of the phase-only filter has been improved for several performance criteria by the design of binary amplitude masks. We present a technique for the implementation of these optimized binary amplitude phase-only filters (BAPOF) using phase-mostly SLMs. Results obtained for the optimization of different criteria are presented. Finally, we present results on the application of these methods to color pattern recognition problems by a multichannel correlation.

关键词： optical correlation

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Phase-encoded joint transform correlator as an optical encryption decoder 2

Phase-encoded joint transform correlator as an optical encry...

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conference on algorithms, devices, and systems for optical information processing

作者： Nomura, T Wakayama Univ Dept OptoMechatron Wakayama 6408510 Japan

ISBN: (纸本)081942921X

The phase-encoded joint transform correlator as a decoder of an optical double random phase encoding system is described. By using the phase-encoded joint transform correlator, it is possible to decode the encrypted image with the same random phase mask which was used in the encryption procedure. The decoding algorithm and optical systems are described. Computer simulations confirm the proposed decoding algorithm.

关键词： optical information processing optical security joint transform correlator

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Overview of high-speed multiple quantum well optical modulator devices and their applications at Lockheed Martin Sanders 2

Overview of high-speed multiple quantum well optical modulat...

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conference on algorithms, devices, and systems for optical information processing

作者： Garvin, C Trezza, JA Ahearn, JS Kang, K Powell, JS Stack, R Sanders Nashua NH 03060 USA

ISBN: (纸本)081942921X

We review GaAs Fabry-Perot vertical cavity electro-optical devices constructed at Lockheed Martin Sanders, with particular attention to spatial light modulators and discuss a number of their applications. Our manufacturing processes enable the construction of large format, highly-uniform optical modulator and smart pixel arrays integrated with silicon CMOS VLSI circuitry. These devices can be used for a wide variety of applications including: optical computing for target recognition and signal processing, optical data routing, optical interconnect systems, and optical memory storage and access.

关键词： spatial light modulator quantum well devices electro-optical devices optoelectronics amplitude modulators phase modulators optical correlation

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processing of multi-sensor data using correlation filters 2

Processing of multi-sensor data using correlation filters

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conference on algorithms, devices, and systems for optical information processing

作者： Mahalanobis, A Raytheon Missile Syst Co Tucson AZ 85731 USA

ISBN: (纸本)081942921X

The theory of correlation filters does not make any assumptions about the sensor or image format. Thus the same class of algorithms is readily applicable to multiple sensor environments such as IR, SAR, LADAR, or CCD (visual). The advantage is that the same theory is valid for multiple sensor applications, the processing steps are common (and code) are re-usable in different sensor platforms, and the algorithms are rapidly re-trainable. The paper points out the key benefits resulting from the general formulation and solution resulting from the correlation approach to ATR.

关键词： Sensors Filtering (signal processing) Image filtering Image processing Automatic target recognition Detection and tracking algorithms Image sensors Data processing Signal processing Synthetic aperture radar

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A novel compact architecture for Banyan Network Interconnection (BNI) 2

A novel compact architecture for Banyan Network Interconnect...

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conference on algorithms, devices, and systems for optical information processing

作者： Yu, CX Yang, QF Beijing Univ Posts & Telecommun Dept Elect Engn Beijing 100876 Peoples R China

A novel compact BNI architecture in free space is composed of symmetrical arrays of binary phase grating having advantages of high spatial density, no coupling material, wide bandwidth, low insertion loss, low crossta... 详细信息

ISBN: (纸本)081942921X

关键词： Banyan Network Interconnection (BNI) binary phase grating (EPG) optical interconnection optical information processing

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Multicriteria optimization approach for optical pattern recognition with nonoverlapping target and scene noise 2

Multicriteria optimization approach for optical pattern reco...

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conference on algorithms, devices, and systems for optical information processing

作者： Kober, V Seong, YK Choi, TS Russian Acad Sci Lab Digital Opt Inst Informat Transmiss Problems Moscow 107447 Russia

ISBN: (纸本)081942921X

The design of filters for pattern recognition that have optimal trade-offs among the criteria of noise robustness, sharpness of the correlation peak, and Horner efficiency when input scene noise is spatially disjoint (nonoverlapping) with the target are presented. Computer simulation is made to illustrate filter performances for optical pattern recognition.

关键词： optical pattern recognition matched filtering

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optical implementation of correlation filters for a photorefractive joint transform correlator 2

Optical implementation of correlation filters for a photoref...

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conference on algorithms, devices, and systems for optical information processing

作者： Colin, J Landru, N Laude, V Rajbenbach, H Huignard, JP Thomson CSF Optron F-78283 Guyancourt France

ISBN: (纸本)081942921X

An optical photorefractive joint transform correlator (PRJTC) was built using a twisted liquid crystal spatial light modulator in the input plane to display the images and a photorefractive crystal in the Fourier plane to perform the nonlinear correlation. We present here new correlation filters to optimize the correlation. There filters are correlated with the scene instead of the simple reference. To calculated these filters, we introduce two characteristics of the setup to optimize the filters : the nonlinearity of the photorefractive crystal. the coding domain of the displaying device.

关键词： joint transform correlation non-linear correlation optical implementation of correlation filters optimal filters image processing

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Distortion-invariant pattern recognition algorithms in the presence of environmental degradation of the input image 2

Distortion-invariant pattern recognition algorithms in the p...

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conference on algorithms, devices, and systems for optical information processing

作者： Chan, F Javidi, B Univ Connecticut Dept Elect & Syst Engn Storrs CT 06269 USA

ISBN: (纸本)081942921X

The presence of turbulence such as maritime aerosols between the target and the observer degrades the detection and classification performance of electro-optical sensors and detectors. A filtering algorithm that takes into account of the environmental degradation, the background non-overlapping noise, the non-stationarity of the scene, non-target objects and additive system noise is designed and implemented to detect and classify targets under such conditions. The detection performance of this algorithm has been validated using computer simulations and found to be superior to filters that are optimal with respect to noise statistics but do not take into account the effects of environmental conditions. The algorithm is then extended using a set of training images to be distortion-invariant with respect to different target aspects.

关键词： image processing target detection optimal filtering environmental degradation distortion invariant filter pattern recognition

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On the optimality of nonlinear joint-transform correlation in the context of the statistical estimation theory 2

On the optimality of nonlinear joint-transform correlation i...

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conference on algorithms, devices, and systems for optical information processing

作者： Réfrégier, P Ecole Natl Super Phys Marseille Lab Signal & Image F-13397 Marseille 20 France

ISBN: (纸本)081942921X

Nonlinear joint transform correlators (JTCs) have been proposed for optical information processing. They have been shown to be attractive in many difficult instances because of their high discriminating performance. However, unlike the linear matched filter, which was designed on the basis of the statistical estimation theory before its implementation in optical correlators, investigations on nonlinear filtering techniques have been mostly experimental and their basic properties in terms of signal processing and pattern recognition still need theoretical analyses. We propose in this paper to analyze the optimal solutions obtained in the context of the statistical estimation theory when the spectral density of the additive gaussian noise is unknown. Maximum likelihood, maximum a posteriori and Bayesian solutions to this problem are discussed and practical consequences are analyzed. In particular, we show that nonlinear JTC methods can be considered as a first order, but very efficient, approximation of these optimal solutions.

关键词： Bayesian method non linear joint transform correlation statistical optical pattern recognition optimal optical information processing

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