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

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All-optical parallel switching by the use of guided wave geometry composed of a thin silver film and a polymer thin film containing organic dye 2

All-optical parallel switching by the use of guided wave geo...

引用

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

作者： Nagamura, T Sasaki, K Shizuoka Univ Elect Res Inst Hamamatsu Shizuoka 4328011 Japan

ISBN: (纸本)081942921X

A novel all-optical parallel switching device was proposed based on photoinduced changes of a complex refractive index in a guided mode thin film composed of silver and polymer containing organic dyes. An incident angle of a probe beam. was set at a value corresponding to the minimum reflection due to a guided wave mode, Pulsed laser excitation caused changes of absorption of the polymer films due to excited state formation or photochromism, which resulted in the increase of reflection because the guided mode condition was changed, According to the Kramers-Kronig. relationship the real part also changes, which results in the shift of the minimum, We can select the wavelength. for all-optical switching in this geometry, We used phthalocyanines and photochromic spiropyran dispersed-in poly(vinyl alcohol) or polystyrene. For the former system, transient absorption due to the excited triplet gave a highly reversible very fast modulation of green light upon repeated excitation by ns laser. For the latter, self-held switching was achieved upon UV or visible laser excitation with response times less than 20 ns, The details of these systems will be presented.

关键词： all-optical switch photoinduced changes of a complex refractive index guided mode thin film silver and polymer thin films organic dyes reflection Kramers-Kronig relationship photochromic transient absorption

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High-speed compact photorefractive joint-transform correlator 2

High-speed compact photorefractive joint-transform correlato...

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algorithms, devices, and systems for optical information processing II

作者： Colin, Jérôme Rajbenbach, Henri J. Laude, V. Breugnot, Sébastien Huignard, Jean-Pierre Thomson-CSF Optronique Rue Guynemer BP 55 Guyancourt78283 France Thomson-CSFLaboratoire Central de Recherches Domaine de Corbeville Orsay91403 France

A high speed optical correlator is presented in this paper. It is a joint transform correlator using a BSO photorefractive crystal in the Fourier plane. The performance of the system such a rotation and scale robustness are presented for fingerprint recognition. To demonstrate the interest of such an optical processor, a comparison with numerical systems is presented. Besides, we will also show that the evolution of correlators is quite compatible with the evolution of numerical processors.

关键词： optical correlation

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Joint transform correlator using multi-value hit-or-miss transformation 2

Joint transform correlator using multi-value hit-or-miss tra...

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

作者： Cheng, G Jin, GF Wu, MX He, QS Liu, HS Yan, YB Tsing Hua Univ State Key Lab Precis Measurement Technol & Instru Beijing 100084 Peoples R China

ISBN: (纸本)081942921X

Among a variety of optical correlators, the joint transform correlator (STC) has some advantages over others and has been extensively studied. However, in some cases, a direct correlation of the input image with a reference image would not be able to find the matched pattern. Recently, morphological hit-or-miss transformation (HMT) has been used to improve the pattern recognition ability of JTC. In this paper we use the concepts of uncertain pixel to improve the distortion-invariant ability of morphological hit-or-miss transformation used in JTC. The novel method is called joint rank-order multi-value hit-or-miss transformation(JRMHMT), which reduces the decision effect of the pixels that is easily disturbed by rotation and scaling distortion. Without losing information of the input images, JRMHMT can realize the precision recognition between two images and has a better distortion-invariant ability in scaling and rotation than the ordinary HMT methods. The comparisons of JRMHMT with the ordinary HMT methods in theoretic analysis and experiments are given in this paper. Based on a single lens JTC and a novel multi-value complementary encoding method, joint rank-order multivalue hit-or-miss transformation correlator (JRMHMTC) is constructed for realized MVHMT in one step. The correlated result image can be thresholded with a high-level threshold so that correct justification can be achieved. The simulation results and experimental demonstrations are both listed.

关键词： joint rank-order multi-value hit-or-miss transformation uncertain pixels multi-value complementary encoding joint transform correlator optical pattern recognition

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Real-time face recognition system with optical learning neural network 2

Real-time face recognition system with optical learning neur...

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algorithms, devices, and systems for optical information processing II

作者： Yatagai, Toyohiko Yagai, Yutaka Mori, Masahiko Watanabe, Masanobu Institute of Applied Physics University of Tsukuba Tennodai 1-1 Tsukuba305-8573 Japan Optoelectronjcs Division Electrotechnical Laboratory Umezono 1-1-4 Tsukuba305-8568 Japan

We describe an optical learning three-layer neural network that uses a back-propagation algorithm for human face recognition. Learning is performed by two-dimensional optical means for handling images without scanning and pixeling, because a face recognition problem needs a large-scale network. The two-dimensional input image is treated directly without vectorizing so that a recognition process of an unknown facial image is executed in real-time. We demonstrate training and recognition of three human faces using an experimental system.

关键词： Network layers

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Improving the processing speed of an LCD panel based correlator by using a multi-channel correlation approach

Improving the processing speed of an LCD panel based correla...

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conference on Display devices and systems II

作者： Liu, HS Wu, MX Jin, GF Cheng, G He, QS Yan, YB Tsing Hua Univ State Key Lab Precis Management Technol & Instrum Beijing 100084 Peoples R China

ISBN: (纸本)0819430218

Liquid crystal devices (LCDs) have proven to have adequate characteristics for use as the spatial light modulators (SLMs), which are the key devices in the real-time optical information processing systems. However, the effective update rate of the LCD is rather low due to the transient response of the liquid crystal molecules and it has restricted the processing speed of the optoelectronic processors. In this paper, we use a multi-channel correlation approach to improve the processing speed and get satisfactory experimental results. The speed has been improved from 6 to 12 images per second. By this approach, not only the processing speed can be improved, but also the display area of the LCD can be sufficiently exploited.

关键词： liquid crystal devices (LCD) update rate multi-channel correlation

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Spatio-temporal conversion, storage, and processing using femtosecond optical pulses

Spatio-temporal conversion, storage, and processing using fe...

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conference on Photorefractive Fiber and Crystal devices - Materials, optical Properties, and Applications IV

作者： Marom, DM Oba, K Sun, PC Mazurenko, YT Fainman, Y Univ Calif San Diego Dept Elect & Comp Engn La Jolla CA 92093 USA

ISBN: (纸本)0819429252

optical signal processing, traditionally employed in the spatial domain, has been experiencing a renaissance with femtosecond laser pulse technology. Temporal optical information can now be manipulated via linear and nonlinear processes, and stored and retrieved, by converting optical signals between the spatial and temporal domains. In this manuscript, we review the state-of-the-art in the spatio-temporal optical signal processing techniques for information data coding, data conversion, signal recording, as well as signal characterization. Applications of these techniques for future computing, communication, storage, and signal processing systems are discussed.

关键词： Holograms Holography Femtosecond phenomena Telecommunications optical communications optical filters Receivers Fourier transforms Picosecond phenomena Ultrafast phenomena

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Segmentation of textured images using local spatial-frequency representation

Segmentation of textured images using local spatial-frequenc...

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conference on Applications of Digital Image processing XXI

作者： Tao, Y Res Inst Marine Boiler & Turbines Wuxi 214151 Jiangsu Peoples R China

ISBN: (纸本)0819429155

This paper presents an algorithm for segmentation of textured images. The algorithm uses an unsupervised neural network and K-means method to classify: image pixels based ori image local spatial-frequency information. The short-time Fourier transform employs large size window function to extract more neighborhood information. The problems of introducing large size windows in classifying larger transient regions are also investigated. High segmentation resolution is obtained by an novel image extrapolation approach and a re-classification procedure for transient areas.

关键词： Image segmentation Fourier transforms Image processing algorithms and systems Image processing Neural networks Image classification Evolutionary algorithms Statistical analysis Detection and tracking algorithms Visual system

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Hybrid optoelectronic processing and computer vision techniques for intelligent debris analysis 2

Hybrid optoelectronic processing and computer vision techniq...

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algorithms, devices, and systems for optical information processing II

作者： Wu, Q.M. Jonathan Grover, Chander P. Dumitras, Adriana Liew, Dewey Jerbi, Ali Institute for National Measurement Standards National Research Council Canada Building M-36 Montreal Road Campus OttawaONK1A 0R6 Canada Department of Electrical and Computer Engineering University of British Columbia Canada Integrated Manufacturing Technology Institute National Research Council Canada Canada

Intelligent Debris Analysis (IDA) requires significant time and resources due to the large number of images to be processed. To address this problem, we propose a hybrid optoelectronic and computer vision approach. Two major steps are involved for IDA: patch-level analysis and particle level analysis. An optoelectronic detection system using two ferroelectric liquid crystal spatial light modulators is designed and constructed to perform path-level analysis, and advanced computer vision techniques are developed to carry out more intelligent particle-level analysis. Since typically only a small portion of the debris filters require more sophisticated particle-level analysis, the proposed approach enables high-speed automated analysis of debris filters due to the inherent parallelism provided by the optoelectronic system.

关键词： optical data processing

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The progress of near-field optics research - activities in China

The progress of near-field optics research - activities in C...

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conference on Far-Field and Near-Field Optics - Physics and information processing

作者： Zhu, X Song, FJ Beijing Univ Dept Phys Beijing 100871 Peoples R China

ISBN: (纸本)0819429228

The progress of near-field optics research and its application in some Chinese universities and institutions is overviewed. The research activities on the instrumentation aspect of scanning near-field optical microscope, novel sample-tip regulation mechanism, fiber-tip preparations, high resolution imaging and near-field spectroscopy in confined mesoscopic systems, light emission new materials and devices, theoretical development of near-field light-matter interactions, new observations of physical phenomena in the near-field region, optical nanostructuring, are summarized. The current research projects and future prospective of the possible application of SNOM and nearfield fluorescence imaging to biology, such as the in vitro cell nuclear assembly and apoptosis as well as gene recognition and DNA sequencing, and opto-electro devices are discussed.

关键词： near-field optical microscopy near-field spectroscopy evanescent wave tip-sample interaction

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Dynamic data mining using an electro-optical data warehouse

Dynamic data mining using an electro-optical data warehouse

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1998 IEEE information Technology conference on information Environment for the Future

作者： Berra, PB Mitkas, PA Liuzzi, RA PBB Syst Canastota NY 13032 USA

ISBN: (纸本)0780399145

Large information systems that manage terabytes of data must provide rich functionality so that interesting new applications can be addressed. Since a wealth of data, information and knowledge are resident within these vast repositories, a variety cg knowledge discovery techniques have developed. These techniques are very computationally intensive and require the movement of large amounts of data. In the search for new approaches, optics may be able to help since photons have the very attractive properties of high speed, non-interference, and parallelism. optical systems can accommodate a large number of parallel, high-bandwidth channels and optical storage devices have very high storage densities. In this research we postulate an electrooptical computer architecture and examine the feasibility of executing a number of alphanumeric and image knowledge discovery algorithms on large multimedia data/knowledge bases with the purpose of increasing performance and functionality.

关键词： Data warehouses

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