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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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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...

引用

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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Modified morphological correlation via binary representation 2

Modified morphological correlation via binary representation

引用

algorithms, devices, and systems for optical information processing II

作者： Marom, E. Mendlovic, D. Shemer, A. Shabtay, G. Tel Aviv University Faculty of Engineering Tel Aviv69978 Israel

The morphological correlation is the optimal method for searching a reference object in an input scene when the figure of merit is based on the mean absolute error (MAE). In practice, it was found that the morphological correlation exhibits high discrimination ability between similar patterns in recognition systems. It is based on threshold slicing the input image as well as the reference filter into many binary slices, as many as the dynamic range of the input permits. The threshold slices of the input and the reference are then correlated and summed up to obtain the morphological correlation. This operation is characterized by a sharp correlation peak but requires many correlation operations. In this work we propose a novel correlation operation that is characterized by even higher discrimination capabilities than exhibited by the conventional morphological correlation and requires less computational effort. The method is based upon the binary representation of the gray level of each pixel in the image. For example: if the dynamic range allows the definition of 256 levels, i.e., 8 binary bits, then a level of 10 will be represented as 00001010. Unlike the morphological correlation, the proposed modification is based on correlating binary slices that are the bitmap representations. Thus, only 8 slices of the input and the reference are required and only 8 correlations rather than 256 performed. The optical implementation of the new approach is fairly simple and can be utilized via the well-known joint transform correlator architecture. Experimental results demonstrate the advantages of the suggested method.

关键词： optical correlation

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Automated hyperspectral ground processing chain

Automated hyperspectral ground processing chain

引用

conference on Imaging Spectrometry IV

作者： Alexander, RJ Cheatham, PS Spectral Informat Technol Applicat Ctr Fairfax VA 22033 USA

ISBN: (纸本)0819428930

A concept for processing of hyperspectral data is described which would make hyperspectral data from an operational system routinely available to customers. Customers not be required to be expert in spectral science. Customers would be offered data in a form readily useable by traditional image processing and Geographical information systems, with flexibility for application to their particular interests. This concept consists of an automated processing environment and a rigorous chain of algorithms to generate a variety of products, orderable by end users. The proposed processing chain can support many users, generate products within a few hours, provide repeatable information content, and enable users to focus their expertise on their area of interest and not on spectral analysis. Implementation of this concept would lead to a National standard for spectral data and products.

关键词： spectral processing ground processing spectral data reduction spectral products automation

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optical metrology for industrialization of optical information processing 9

Optical metrology for industrialization of optical informati...

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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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Towards a practical technology for ultrafast optical switching

Towards a practical technology for ultrafast optical switchi...

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International conference on Applications of Photonic Technology (ICAPT 98)

作者： Smith, PWE Univ Toronto Dept Elect & Comp Engn Toronto ON M5S 3G4 Canada

ISBN: (纸本)0819429503

There is increasing interest in developing ultrafast optical switching and signal-processing capabilities for tomorrow's information systems. To find significant application, an ultrafast switching technology should utilize components that are small, have low power consumption, and are integrable with other optoelectronic components such as lasers and detectors. In this paper we describe recent progress in the development of semiconductor materials with ultrafast optical response, and in the design of devices using these materials with useful ultrafast switching characteristics. We show that these devices should be able to satisfy all of the criteria for a practical ultrafast switching technology.

关键词： Ultrafast phenomena Switching Gallium arsenide Absorption optical switching Picosecond phenomena Semiconductor materials Optoelectronic devices Sensors Telecommunications

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