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检索条件"任意字段=Optoelectronic and Hybrid Optical/Digital Systems for Image and Signal Processing"

共 147 条记录，以下是51-60 订阅

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Spatial light modulators in by-page volume holographic memory architecture

Spatial light modulators in by-page volume holographic memor...

引用

International Workshop on optoelectronic and hybrid optical/digital systems for image and signal processing

作者： Gurevich, SB Akkoziev, IA Alymkulov, SA Gurevich, BS Zhumaliev, KM AF Ioffe Phys Tech Inst St Petersburg 194021 Russia

ISBN: (纸本)0819437956

The role and place of the spatial light modulators (SLM) in holographic memory devices (HMD) with try-page data storage have been estimated. The conditions under which the SLM characteristics are optimized for the information input into HMD, have been considered. It has been shown that it is not enough to make the demands to the SLM harder but it is necessary that they would not be set too high.

关键词： Holograms Head-mounted displays Spatial light modulators Diffraction Holography Lithium Multiplexing Volume holography Data storage signal to noise ratio

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Frame processing unit for thermovision camera based on solid programmable gate array

Frame processing unit for thermovision camera based on solid...

引用

International Workshop on optoelectronic and hybrid optical/digital systems for image and signal processing

作者： Kondratov, P Bozhenko, I Hrytskiv, Z Muravov, S Res & Design Inst ELVIT UA-290005 Lviv Ukraine

ISBN: (纸本)0819437956

The video signal preprocessing unit (processor) for thermovision camera, developed by the authors on the basis of a pyroelectric vidicon, is intended for: calculation of a difference between the "positive" and "negative" frames, obtained in obturation mode: n-divisible accumulation of the resulting frame;non-volatile storage of the received images;images transmission to the computer. These functions are realized by means of following units: video signal digitizer;arithmetic-logical unit;accumulation, display and archive memory units;microcontroller. Processor is developed with Field Programmable Gate Arrays (FPGA) use. Its structure is considered.

关键词： pyroelectric vidicon frame processor thermovision camera field programmable gate array

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Imaging polarimeter for testing single crystals and phase retardation plates

Imaging polarimeter for testing single crystals and phase re...

引用

International Workshop on optoelectronic and hybrid optical/digital systems for image and signal processing

作者： Shopa, YI Bodnar, MI Savitsky, DI Ivan Franko State Univ Lviv UA-290005 Lviv Ukraine

ISBN: (纸本)0819437956

Spatial inhomogeneity of the phase difference in the birefringent plates of YAlO3 and LiNbO3 crystals with the dimensions ranging from 7x8 to 20x20 mm(2) are measured. A considerable eigenwave ellipticity k similar to 0.001 is revealed in the samples doped with neodymium, which can be explained by lowering symmetry of those crystals. The studies for the spatial optical inhomogeneities are performed with the imaging polarimeter which utilizes computer registration and processing of images. The apparatus have been used for the measurements of spatial distribution of the optical anisotropy parameters characterizing several single crystals. The results obtained agree well with the data derived with the automated polarimeter which works according to a single-ray scheme and utilizes usual single-element photodetector.

关键词： polarimetry image spatial distribution nondestructive testing nonlinear crystal birefringence

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Accuracy of whole-field mapping by Jones matrix Fourier photopolarimeter

Accuracy of whole-field mapping by Jones matrix Fourier phot...

引用

International Workshop on optoelectronic and hybrid optical/digital systems for image and signal processing

作者： Berezhna, S Berezhnyy, I Takashi, M Voloshin, A Aoyama Gakuin Univ Dept Engn Mech Tokyo Japan

ISBN: (纸本)0819437956

A whole-field polarimetric method through digital image processing has been developed for mapping the three optical parameters, which determine normalized Jones matrix of an elliptic retarder. The suggested technique conveys measurement data sufficient to describe optical anisotropy in the media exhibiting rotation of birefringence axes along the light path. Particularly, homogeneous or inhomogeneous birefringent gyrotropic objects and initially isotropic transparent samples bearing stress-induced anisotropy can be investigated by use of this technique. Operational principle of the method implies incremental rotation of polarizer and analyser with the ratio 1:3 over the revolution of the polarizer and collection of 9 intensity images between successive rotation steps. Then thus obtained intensity patterns are digitally processed by use of Fourier analysis. Specifically in this paper we address issues concerning the accuracy of mapping all the three parameters at different values of those. Some ad hoc experiments with test crystalline quartz phase plates are reported. Computer simulations and measurement results are presented and discussed.

关键词： whole-field polarimetry Jones matrix elliptic retarder digital image processing

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Real time Fourier hologram recording in photopolymers with phase response.

Real time Fourier hologram recording in photopolymers with p...

引用

International Workshop on optoelectronic and hybrid optical/digital systems for image and signal processing

作者： Ezhov, PV Smirnova, TN Tikhonov, EA NASU Inst Phys UA-252650 Kiev Ukraine

ISBN: (纸本)0819437956

The results of researches of phase Fourier holograms recording on the self-developing photopolymer PPC-488 with a photosensitivity in a range lambda = 400 - 500 nm are presented(1). It is shown, that due to non-stationary energy transfer between recording and scattering beams and, accordingly, the noise holograms amplification essential decreasing of the signal to noise ratio (SNR) has place at relatively high efficiency of Fourier holograms (more than 50 %). It has been found, that recording of the noise holograms can be appreciably suppressed by increasing of intensity of reference beam concerning to intensity of object beam. On this way it was possible to improve the SNR for the Fourier holograms of binary phase masks: at a reference to object beams ratio R =26 the phase Fourier holograms with efficiency 15 % and SNR 20 dB has been recorded.

关键词： self-developing photopolymer Fourier hologram signal to noise ratio dynamical noise self-amplification nonstationary energy transfer

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Logic-temporary function derivative using in image recognition

Logic-temporary function derivative using in image recogniti...

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optoelectronic and hybrid optical/digital systems for image and signal processing

作者： Kozhemiako, V. Ponuraya, E. Sachaniuk, N. Hamdy, R. Vinnitsa State Technical Univ Vinnitsa Ukraine

The logic temporary function derivative used in image recognition is presented. The new way of the object type definition was proposed using the quantronum (KVP) transformation.

关键词： optoelectronic devices

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Information transmission in acousto-optic imaging systems

Information transmission in acousto-optic imaging systems

引用

International Workshop on optoelectronic and hybrid optical/digital systems for image and signal processing

作者： Gurevich, BS Andreyev, SV Belyaev, VA Kaupinen, MV Kantserov, AI Alymkulov, SA BASK Ltd St Petersburg Russia

ISBN: (纸本)0819437956

Different kinds of acousto-optic imaging systems have been observed from the point of view of their capability to transmit and process information. The major attention have been paid to the systems providing image projection. Acousto-optic light projection system represents a kind of light information systems in which two kinds of information are used: basic and auxiliary information. The auxiliary information contains data which are used in order to arrange the basic information in such form that it would require no additional decoding means, When such auxiliary data an used, the signal-to-noise ratio falls because each operation introduce its own noise. Several ways of additional information input have been considered from the point of view of the useful information transmission optimization. In order to perform this consideration, such standard information parameters as information capacity and information transmission capability have been assigned to the system as well as to its separate links. These parameters limitations providing by acousto-optic deflection and modulation units have been estimated. These limitations are connected with the certain contradiction between attempts to increase both information parameters simultaneously. This contradiction is connected with nature of acousto-optic interaction, however it differs from that taking place while optimizing the information parameters of acousto-optic spectrum analyzers, The results of information parameters estimation for the systems we had experimentally performed, have been stated and discussed.

关键词： Acousto-optics Bragg cells Projection systems Imaging systems Modulation Crystals signal to noise ratio Spectral resolution Acoustics Spectrum analysis

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Adaptive correlation image processing by collinear optical heterodyning with hologram lens scanning

Adaptive correlation image processing by collinear optical h...

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optoelectronic and hybrid optical/digital systems for image and signal processing

作者： Tsvetov, Evgeny R. Russian Acad of Science Moscow Russia

The optical heterodyne correlator (OHC), in which the functions of overlapping and fast scanning by reference image relatively signal image and light frequency shift between them are realized with hologram lens scanner (HLS) in JFT plane is described. The important feature of the collinear heterodyning is non-sensitivity of its output response to any phase distortions of an amplitude spatial filters (ASF). That provides high instrumental accuracy of OHC and wide possibilities for adaptive processing with using controllable ASF and matrix photoreceiver with controllable sensitivity of each element. Presented results of experiments demonstrate high performance of this scheme. Multichannel fiber optical communication between the imaged JFT plane of OHC scheme and elements of radio or acoustic antenna array permits fast and soft beam forming and scanning by computer controlled optical transparencies and HLS.

关键词： optical correlation

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optically addressed spatial light modulators for coherent optical data processing applications

Optically addressed spatial light modulators for coherent op...

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optoelectronic and hybrid optical/digital systems for image and signal processing

作者： Vladimirov, F.L. Chaika, A.N. Pletneva, N.I. Morichev, I.E. State Optical Inst St. Petersburg Russia

The main characteristics of the optically addressed spatial light modulators (SLM) based on the chalcogenide glass photoconductor and ferroelectric liquid crystal structures, advantages of both types of the SLMs and possible applications are discussed. The results on the comparative study of the two types of the SLMs developed and optimized for the real-time holographic applications are presented.

关键词： Photoconducting devices

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Parametrical transformers and radiosignals spectrum meters on the basis of analysis of phase structure of optical images in acoustooptics

Parametrical transformers and radiosignals spectrum meters o...

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optoelectronic and hybrid optical/digital systems for image and signal processing

作者： Bobitski, Ya.V. Diachok, Ya.J. Lviv State Univ `Lvivska Politechnika' Ukraine

The possibility of the realization of the linear parameter transformers and radio frequensymeter using the acoustooptic modulators was studied. The study is based on the manipulations by the optical phase images of the laboratory investigations carried out for the phase gradient visualization along the direction of the acoustic wave propagation. The study suggests a new, completely different method of transposition of radiosignals spectrum from one carrier to another without the emergence of a mirror channel.

关键词： optical image storage

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