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

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MORPHOLOGICAL TRANSFORMATIONS viA ADVANCED SYMBOLIC SUBSTITUTION ARCHITECTURES

MORPHOLOGICAL TRANSFORMATIONS VIA ADVANCED SYMBOLIC SUBSTITU...

引用

6th conference on Advances in optical information processing

作者： MICHAEL, N ARRATHOON, R WAYNE STATE UNIV DEPT ELECT & COMP ENGNDETROITMI 48202

ISBN: (纸本)081941544X

New optical implementations of single and multichannel symbolic substitution systems are proposed. The systems are fully programmable, can be used with large patterns and are capable of processing large input images at relatively high speeds. Configuration and structure for a variety of morphological transformations such as erosion, dilation, opening, closing and skeletonization are detailed. Simulation results are presented.

关键词： Symbolic substitution Image processing Diffraction gratings Bragg cells Spatial frequencies Holography Holograms Adaptive optics Modulators optical components

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ACOUSTOOPTIC MULTISTABILITY - POSSIBILITIES OF APPLICATION IN optical information processing systems

ACOUSTOOPTIC MULTISTABILITY - POSSIBILITIES OF APPLICATION I...

引用

International conference on optical Memory and Neural Networks 94

作者： BALAKSHY, vi KAZARYAN, AV MOSCOW MV LOMONOSOV STATE UNIV DEPT PHYSMOSCOW 119899RUSSIA

ISBN: (纸本)0819417785

An acousto-optic system with a feedback which controls frequency of acoustic waves excited in an acousto-optic cell is investigated theoretically and experimentally. In the system an amplitude transparent situated in front of a photodetector defines a nonlinear dependence of light intensity registered by the photodetector on the ultrasound frequency. Conditions for appearance of multistable states, which differ by amplitude, frequency and diffracted beam direction, are found. Applications of the system for information channels switch in optical communication and for stabilization of laser beam direction are discussed as well.

关键词： Acousto-optics Photodetectors Adaptive optics Acoustics Ultrasonography Switches Frequency modulation Neural networks optical amplifiers Transducers

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TIME-DELAY BEHAviOR OF HETERODYNE ACOUSTOOPTIC systems

TIME-DELAY BEHAVIOR OF HETERODYNE ACOUSTOOPTIC SYSTEMS

引用

6th conference on Advances in optical information processing

作者： BERINATO, RJ DYNET INC HUNTSVILLEAL 35806

ISBN: (纸本)081941544X

In this paper it is shown that the reference beam for true time delay operation of a heterodyne system must be carefully chosen to achieve proper signal time delay behavior. True time delay is defined here as an equivalent delay of the envelope and carrier frequency of a carrier-modulated waveform, resulting in no apparent phase shift of the envelope. For acousto-optic (AO) tapped delay lines, or more complex AO systems utilized for tapped delay line filters, signal excisors, or beamformers, the reference beam must be equivalent to the undiffracted beam exiting the AO device in order to achieve true time delay. Two examples are used to demonstrate the application of the time delay concepts described in the paper. The first example is a heterodyne transform architecture that uses an external reference beam to select a tap position within an AO cell. The second example is an AO tapped delay line filter that employs the undiffracted beam from the AO interaction as the reference beam.

关键词： Acousto-optics Heterodyning Adaptive optics Photodetectors Signal processing Fourier transforms Phase shifts Signal detection Spatial light modulators optical signal processing

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ADAPTIVE optical RADIAL BASIS FUNCTION NEURAL-NETWORK FOR HANDWRITTEN DIGIT RECOGNITION

ADAPTIVE OPTICAL RADIAL BASIS FUNCTION NEURAL-NETWORK FOR HA...

引用

6th conference on Advances in optical information processing

作者： FOOR, WE NEIFELD, MA UNIV ARIZONA CTR OPT SCITUCSONAZ 85721

ISBN: (纸本)081941544X

An adaptive optical radial basis function classifier for handwritten digit recognition is experimentally demonstrated. We describe a spatially- multiplexed system incorporating on-line adaptation of weights and basis function widths to provide robustness to optical system imperfections and system noise. The optical system computes the Euclidean distances between a 100-dimensional input and 198 stored reference patterns in parallel using dual vector-matrix multipliers. For this experimental software is used to perform the on-line learning of the weights and basis function widths. An experimental recognition rate of 86.7% correct out of 300 testing samples is achieved with the adaptive training versus 52.3% correct for non-adaptive training. The experimental results from the optical system are compared with data from a computer model of the system in order to identify noise sources and indicate possible improvements for system performance.

关键词： Neural networks Computing systems Computer simulations Spatial light modulators Adaptive optics Data modeling optical networks optical signal processing systems modeling Classification systems

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CONTROL processing SYSTEM ARCHITECTURE FOR THE optical COMMUNICATION DEMONSTRATOR 6

CONTROL PROCESSING SYSTEM ARCHITECTURE FOR THE OPTICAL COMMU...

引用

conference on Free-Space Laser Communication Technologies vi

作者： VOISINET, L JET PROP LAB PASADENACA 91109

ISBN: (纸本)0819414166

A processing system was designed and implemented to support beacon acquisition, precision beam pointing, and command/control functions for the optical Communications Demonstrator. The central processor operates as a command controlled embedded system, but by blending real-time and linear design techniques, a single digital signal processor handles all spaceborne functions. Real-time functions include operation of a CCD array detector, calculation of centroids, computation of point-ahead error, and execution of a steering mirror servo loop at 2 kHz update rate. Linear functions include command interpretation, diagnostic control of all functions, storage and interpolation of data for acquisition and point-ahead calculation, downlinking of status information, hardware control, transmit laser control, and image capture.

关键词： Control systems Signal processing Digital signal processing Space operations Telecommunications optical communications Charge-coupled devices Mirrors Beam controllers Computer simulations

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SELECTION OF OPERATING CURVES OF TWISTED-NEMATIC LIQUID-CRYSTAL TELEviSIONS

SELECTION OF OPERATING CURVES OF TWISTED-NEMATIC LIQUID-CRYS...

引用

6th conference on Advances in optical information processing

作者： SOUTAR, C MONROE, SE NASA JOHNSON SPACE CTRDIV TRACKING & COMMUNHOUSTONTX 77058

ISBN: (纸本)081941544X

Twisted-nematic liquid crystal televisions (LCTVs) are currently widely used as spatial light modulators in coherent optical processing systems. With such devices, `phase-' or `intensity-only' modulation is not easily achieved. In this paper we present procedures for finding some specific operating modes that can be achieved with these commercial LCTVs. The operating modes were found both by studying the Lu and Saleh model of LCTVs, and by referring to previous laboratory measurements. We will introduce a simple experimental procedure that can be used to locate a phase-mostly operating mode. The operating modes are considered in the context of a coherent optical correlator.

关键词： Polarizers Modulation Phase shift keying Liquid crystals Mathematical modeling optical correlators Televisions Lutetium Modulators Transmittance

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MULTICHANNEL ACOUSTOOPTIC CORRELATOR FOR TIME-DELAY COMPUTATION

MULTICHANNEL ACOUSTOOPTIC CORRELATOR FOR TIME-DELAY COMPUTAT...

引用

6th conference on Advances in optical information processing

作者： KEEFER, CW TURBYFILL, ME ANDREWS, HG USAF ROME LABGRIFFISS AFBNY 13441

ISBN: (纸本)081941544X

We built and experimentally tested an in-line interferometric time integrating correlator. This design demonstrates performance improvements compared to other time integrating correlators, because the +1 diffracted orders, which carry the information to be correlated, travel over a common path and because the undiffracted light from the first acousto-optic (AO) cell is used as the input to the second AO cell. The architecture also provides control of the correlation spatial frequency to match the detector elements spatial frequency. The simplicity of the design, improved light efficiency, and increased optical stability make it an attractive alternative for applications in radar signal processing and spectrum analysis.

关键词： Prisms optical correlators Sensors Adaptive optics Acousto-optics Spatial frequencies Signal attenuation Imaging systems Interferometry Lithium

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PERFORMANCE MODELS OF CORRELATORS WITH RANDOM AND SYSTEMATIC PHASE ERRORS

PERFORMANCE MODELS OF CORRELATORS WITH RANDOM AND SYSTEMATIC...

引用

6th conference on Advances in optical information processing

作者： COHN, RW HORNER, JL UNIV LOUISVILLE DEPT ELECT ENGNLOUISVILLEKY 40292

ISBN: (纸本)081941544X

In this paper several systematic and random filter plane errors are related through a single parameter that describes the amount of phase mismatch. A model of peak-to-noise ratio (PNR) is also presented that describes the combined effects of random and systematic errors. This expression contains the products of two functions, one that depends only on systematic, the other on random, phase mismatch. PNR is also a function of the number of pixels in the filter plane modulator and a normalized moment the amplitude of the image spectrum. The model is useful for developing phase error budgets for correlation systems.

关键词： Error analysis Electronic filtering optical filters Diffraction optical correlators Phase only filters Phase shift keying Spatial light modulators Performance modeling Wavefronts

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PERFORMANCE MODELING AND MEASUREMENTS IN optical-IMAGE SYNTHESIS systems

PERFORMANCE MODELING AND MEASUREMENTS IN OPTICAL-IMAGE SYNTH...

引用

6th conference on Advances in optical information processing

作者： LAFUSE, JL ROTH, PJ TURPIN, TM FEINLEIB, RE ESSEX CORP COLUMBIAMD 20146

Over the last four years, Essex Corporation has been developing an image reconstruction system (ImSynTM) for a variety of applications, including synthetic aperture radar, magnetic resonance imaging, and other sensors... 详细信息

ISBN: (纸本)081941544X

Over the last four years, Essex Corporation has been developing an image reconstruction system (ImSyn^TM) for a variety of applications, including synthetic aperture radar, magnetic resonance imaging, and other sensors. Each of these formats encompasses its own set of requirements for image quality, image size, and throughput. The ImSyn system has been designed to provide image dynamic range of up to 100 dB, arbitrary image sizes, and throughputs of 30 images per second to satisfy the various requirements. Recent efforts to enhance the ImSyn breadboard version has required the development of modeling techniques to measure system performance and identify sources of error and artifacts. The modeling approach, application of the measurements to determine and improve system performance, and the resulting imagery achieved with the ImSyn breadboard are presented.

关键词： Sensors Transform theory Signal to noise ratio Performance modeling Fourier transforms Image processing Synthetic aperture radar Image quality Magnetic resonance imaging Spatial frequencies

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LOW-BIT RATE IMAGE COMPRESSION EVALUATIONS 3

LOW-BIT RATE IMAGE COMPRESSION EVALUATIONS

引用

conference on visual information processing III

作者： BROWER, BV EASTMAN KODAK CO DIV COMMERCIAL & GOVT SYSTROCHESTERNY 14653

ISBN: (纸本)081941543X

In order to assist the National Imagery Transmission Format Standard (NITFS) Technical Board (NTB) in selecting new BWC algorithm(s), evaluations of candidate image compression algorithms were performed on the basis of objective and subjective image quality performance, bit rate control, susceptibility to channel errors, and complexity of implementation. Based on these evaluations, which were conducted under the guidance of the NTB, it was concluded that the ISO/JPEG DCT compression algorithm was the most suitable for the NITFS purpose even though two proprietary sub-band coding techniques generally performed better in subjective image quality. Moreover, it was decided that three algorithms would be further evaluated at very low bit rates where the ISO/JPEG DCT does not perform optimally.

关键词： Image compression Image quality visualization Wavelets Image quality standards visual information processing Standards development Computing systems Image visualization Detection and tracking algorithms

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