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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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A highly integrated single-chip optical correlator 2

A highly integrated single-chip optical correlator

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

作者： O'Callaghan, MJ Ward, DJ Perlmutter, SH Ji, LH Walker, CM Displaytech Inc Longmont CO 80503 USA

ISBN: (纸本)081942921X

Barriers to commercialization of optical correlators include the complexity and cost of their manufacture, their large size compared to typical electronic processors, and the cost of their components. Using sub-micron CMOS VLSI fabrication processes it is possible to build the two SLMs and photodetector array of a Vander Lugt correlator on a single silicon die. The correlator's lenses can be fabricated on a single piece of glass using diffractive optics technology and then attached to the CMOS die to form a monolithic assembly. This approach greatly reduces the mechanical degrees of freedom that must be controlled by the correlator's housing thus lowering cost, reducing size, and improving reliability. Here we report on the design and performance of a prototype.

关键词： correlator SLM ferroelectric liquid crystal FLC-VLSI active pixel sensor

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Novel implementation of non-linear joint transform correlators in optical security and validation 2

Novel implementation of non-linear joint transform correlato...

引用

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

作者： Weber, D Trolinger, J MetroLaser Inc Irvine CA 92614 USA

ISBN: (纸本)081942921X

Emblems using holograms or other diffractive devices have long been used to mark cards and other objects as a means of authentication. The effectiveness of such emblems as a security device is ultimately determined by the inspection system. Due to the expense and highly variable performance of the human inspector, automated machine leading devices are an attractive alternative for performing the verification task. An additional advantage of the machine reader is that information regarding the card or its holder may be stored covertly. A security verification system is presented consisting of a holographic security emblem in which information is covertly stored, and an automated reader based on a joint transform correlator (JTC). A holographic encoding method is used to produce an emblem that stores the required phase and/or amplitude information in the form of a complex, 3-D diffraction pattern that can only be interpreted through the use of a second "key" hologram. The reader incorporates the use of the non-linear material, Bacteriorhodopsin, as a means of miniaturizing the system, reducing system cost, and improving system performance. Experimental results are presented that demonstrate the feasibility of the approach for security applications.

关键词： holographic encoding non-linear joint transform correlator Bacteriorhodopsin non-linear materials

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Human-like stereo vision system based on optical JTC 2

Human-like stereo vision system based on optical JTC

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

作者： Kim, KT Lee, JS Kim, SH Kim, ES Park, SY Lee, YB Kwangwoon Univ Dept Elect Engn Nowon Ku Seoul South Korea

ISBN: (纸本)081942921X

A stereo vision system, as it receives two images equivalent to the one shown on left and right human eyes, can provide 3-D effect. However, the stereo disparity caused by the different parallax of the two images makes an observer feel fatigued and reduces the 3-D effect. Therefore, this paper presents a new approach to keep the stereo disparity to be zero via a JTC-based adaptive tracking of a moving object. In this method, the optical JTC system tracks the relative locations of a moving objects via measuring the correlation peak of the two images. Through some optical experiments the proposed stereo vision system is proved to be insensitive to background noises and control the convergence angle in real-time.

关键词： optical JTC stereo disparity stereo imaging system centroid method

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Optoelectronic system for space variant signal and image processing 2

Optoelectronic system for space variant signal and image pro...

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

作者： Shames, PE Laut, S Ambs, P Fainman, Y Univ Calif San Diego Dept Elect & Comp Engn La Jolla CA 92093 USA

ISBN: (纸本)081942921X

We present a study on a high-speed optoelectronic system for implementing space variant transforms (SVT) in image and signal processing using a Hough Transform (HT) as an example. The HT has been found to be highly useful in applications requiring detection of lines, ellipses and hyperbolic shapes, such as radar detection and data fusion, topographical map analysis, etc. However, the implementation of a SVT such as HT, is computation and memory intensive, e.g. HT of an image of dimension N x N requires greater than N-3 operations. All-electronic systems remain inadequate when real time SVT processing of large data sets is required. In this paper we show that an optoelectronic (OE) system employing parallel processing can perform such SVT requiring on the order of only N steps. We show that our proposed OE system can HT an input image of dimension N = 1024 in 2.1 ms.

关键词： space-variant transforms Hough transforms optoelectronic system computer-generated hologram Image and signal processing

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Separation of random phase mask in optical correlator for security verification 2

Separation of random phase mask in optical correlator for se...

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

作者： Muravsky, LI Fitio, VM Shovgenyuk, MV Hlushak, PA NAS Ukraine Physicomech Inst Dep 24 UA-290601 Lviv Ukraine

ISBN: (纸本)081942921X

The security verification method using a transform random phase mask as an optical mark bonded to a document or other product is proposed. This mask consists of separated and shifted fragments of a reference phase mask. If the the transformed and the reference masks are entered into an optical correlator, the autocorrelation peaks series is produced on the correlator output. The distances between peaks and the peak intensities were used to produce the feature vector. Identification of the document or other product takes place if the feature vector and the reference feature vector coincide. The procedure of the transformed mask generation and the process of the peaks' producing in an conventional joint transform correlator were considered The advantages of transformed mask applications in optical correlators are discussed The joint transform correlator experimental setup containing the spatial light modulator PRIZ was designed and the optimal conditions to produce the autocorrelation peaks were found.

关键词： security verification random phase mask transformed phase mask joint transform correlator optical security device autocorrelation peak feature vector spatial light modulator

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Optimal location of an intensity fluctuating target in nonhomogeneous and nonoverlapping background 2

Optimal location of an intensity fluctuating target in nonho...

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

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

ISBN: (纸本)081942921X

Recently, optimal algorithms for locating a target on nonoverlapping background, based on maximum likelihood approach, have been designed.(1-4) In particular, different ways of modeling the target have been proposed.(1,2) When the gray levels of the target are known, the reference of the target can be modeled as a deterministic function. On the other hand, when the gray levels of the target in the input image are unknown or can vary from one image to another one, the reference of the target has to be considered as a pattern with random gray levels. Moreover, it is possible to unify both the deterministic a,nd the random target approaches into a single model, where the target is modeled using a linear combination of deterministic values and random variables.(5) Based on this model, we propose to design an algorithm that optimizes the likelihood ratio between the two hypothesis that a target is present and that it is absent within a small sub-window of the image. We show that this technique is more efficient than the maximum likelihood approach when the noise statistic of the background is strongly nonhomogeneous, which is the case in many real-world images. The presented algorithm is based on correlations and it can thus be implemented in an architecture using optical correlators.

关键词： object detection and location optimal statistical filtering algorithms optical correlation

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optical preprocessing in a laser-speckle correlation measurement technique for the determination of engineering strain within specimen 2

Optical preprocessing in a laser-speckle correlation measure...

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

作者： Kargel, C Zagar, BG Graz Tech Univ Inst Elect Measurement & Measurement Signal Proc A-8010 Graz Austria

ISBN: (纸本)081942921X

This paper is concerned with a method of non-contacting measurement of mechanical strain within specimen. It describes a new optical set-up to perform high. speed digital laser-speckle correlation with the ultimate aim to deduce surface element displacements associated with the translation of laser-speckles emanating from those surface elements. The novel optical set-up combined with the application of line scan cameras: attached to digital signal-or very fast general-purpose processors allows measurement fates that for most practical purposes are only limited by the integration time of the camera necessary to obtain properly exposed images, Instead of obtaining a two-dimensional vector by searching for the best space-lag for a digitally calculated cross-correlation estimate of the initial and translated speckle images a single component of that vector parallel to the straining direction is obtained by finding the space-lag of optically preprocessed almost one-dimensional speckle fields. The necessary optical preprocessing is performed in the Fourier-plane of the imaging optics. This way the numerical complexity of the algorithm is greatly reduced resulting in lower processing time per frame. System considerations for practical strain measurements are detailed and the measured sensitivities are presented.

关键词： strain measurement speckle-correlation technique optical Fourier-filtering

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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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