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Advances in optical information processing IV

Advances in Optical Information Processing IV

引用

Advances in optical information processing IV

ISBN: (纸本)0819403474

This conference proceedings contains 41 papers arranged in five sections. Section 1 reviews ongoing research in optical processing including recent results in optical correlator, optical computer photorefractive, and spatial light-modulating device research. Section 2 deals with new developments in filter design, particularly phase-only filters and experimental filter implementations. Section 3, covering optical processing is devoted primarily to new developments in 2D-optical signal processing systems for spectral analysis and range/doppler signal processing. Section 4 concerns acousto-optic spectrum analyzer systems and components. Section 5 deals with optical computing and presents various algorithms and architectures for computing.

关键词： optical Data processing

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Statistical analysis of inherent ambiguities in recovering 3-D motion from a noisy flow field

Statistical analysis of inherent ambiguities in recovering 3...

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International conference on Pattern Recognition

作者： G.-S. Young R. Chellappa Signal and Image Processing Institute Department of EE-Systems University of Southern California USA

The inherent ambiguities in recovering 3-D motion information from a single optical flow field are studied using a statistical model. These ambiguities are quantified using the Cramer-Rao lower bound, which is a lower bound for the error variances of motion parameter estimates. This performance bound is independent of the motion estimation algorithms, and can always be computed for any arbitrary 3-D motion of a rigid surface by inverting a 5*5 matrix. For the general motion of an arbitrary surface, it turns out that not every pixel gives information regarding 3-D motion estimation. It is shown that the aperture problem in computing the optical flow restricts the nontrivial information about the 3-D motion to a sparse set of pixels at which both components of the flow velocity are observable. Computer simulations are used to study the dependence of the inherent ambiguities on the underlying motion, the field of view, and the number of feature points for the motion in front of a nonplanar environment. It is shown that introducing a smoothness constraint by fitting local patches gives even lower bounds and thus is a justified technique for stabilizing the ill-posed motion estimation problem.< >

关键词： Statistical analysis Motion analysis Image motion analysis optical noise Motion estimation optical sensors optical computing Pollution measurement Apertures optical devices

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Device development for optical computing

Device development for optical computing

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Summaries of Papers Presented at the conference on Lasers and Electro-Optics

作者： Tanguay Jr., Armand R. Univ of Southern California Los Angeles CA USA

ISBN: (纸本)1557520860

A wide range of modern information processing applications that are not easily amenable to solution by conventional sequential processing algorithms and machines or even by parallel multiprocessor architectures with a limited degree of interconnection capability are identified. The potential of optical information processing and computing systems for these applications is discussed, focusing on the need to develop the necessary components. A number of recent advances in advanced integrated optical signal processors, photorefractive volume holographic optical elements, and optical disks used as reconfigurable spatial light modulators are examined.

关键词： optical Data processing

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Melecon' 89 Mediterranean Electrotechnical conference

Melecon' 89 Mediterranean Electrotechnical Conference

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Mediterranean Electrotechnical conference (MELECON'89) - Proceedings

The proceedings contains 196 papers. The following topics are dealt with: photovoltaic energy systems;static power converters;power electronics, monitoring;hydro-power systems;wind energy systems;materials;modeling;power systems;kinetic-electronic systems;digital signal processing theory and algorithms;adaptive and array processing;speech analysis, synthesis, and coding;speech recognition;applications of digital signal processing;image analysis and coding;VLSI and its industrial applications;microwave solid-state circuits;image filtering, recognition, classification, and recovering;communication elements and control;frequency hopping and spread spectrum;developments in switching systems;transmission and reception theory and systems;industrial applications of computer-aided design;satellite communications and antennas;radiocommunications and spread spectrum;communication circuits;optical communications and devices;communication systems;computer networks;microwave and millimeter-wave circuits and systems;university-industry interactions;information technology education;and curriculum development.

关键词： Electrical Engineering

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Communications issues in data engineering: 'have bandwidth-will move data'

Communications issues in data engineering: 'have bandwidth-w...

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International conference on Data Engineering

作者： O. Frieder Network Systems Research Division Bell Communications Research Inc. Morristown NJ USA

It is argued that those areas of data engineering research which are based on the assumption that communication bandwidth is a constraint, should be investigated. Some additional distributed database issues that require reinvestigation include concurrency control, network partitioning, backup storage and recovery algorithms. With the availability of increased bandwidth, global flooding of information can result in lower processing times than conventional approaches. Hence, broadcast-based solutions which continuously inform the various sites of the system status and data modifications need to be reconsidered. Novel transmission rates also invalidate old assumptions.< >

关键词： Data engineering Bandwidth Multiprocessing systems optical fibers Biomedical imaging Displays Delay Parallel processing Protocols Engines

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An experimental system for the integration of information from stereo and multiple shape from texture algorithms

An experimental system for the integration of information fr...

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Intelligent Robots and Computer vision vi 1987

作者： Boult, Terrance E. Moerdler, Mark Columbia University Department of Computer Science New York CityNY10027 United States

In numerous computer vision applications, there is both the need and the ability to access multiple types of information about the three dimensional aspects of objects or surfaces. When this information comes from different sources the combination becomes non-trivial. This paper describes the present state of ongoing research in Columbia's vision Laboratory in the integration of multiple visual sensing methodologies which yield three dimensional information, in particular, feature based stereo algorithms, and various shape-from-texture algorithms are already in operation and multi-view shape-from-texture and shape-from shading modules are expected to be incorporated. Unlike most systems for multi-sensor integration, which fuse all the information at one conceptual level, e.g., the surface level, the system under development uses two levels of data fusion, intra-process integration and inter-process integration. The paper discusses intra-process integration techniques for feature-based stereo and shape-from-texture algorithms. It also discusses a inter-process integration technique based on smooth models of surfaces. Examples are presented using camera acquired images. © 1988 SPIE. All rights reserved.

关键词： Stereo image processing

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optical AND HYBRID COMPUTING.

OPTICAL AND HYBRID COMPUTING.

引用

optical and Hybrid Computing.

ISBN: (纸本)0892526696

This conference proceedings contains 35 papers. These paper address recent technical advances in optical and hybrid computing, including perspectives on where this important new technology is heading. The topics include algorithms for linear and nonlinear systems, computing architectures based on bistable and molecular devices, neural networks and its computing applications, application-driven devices and system development, optics and symbolic computing, optical information processing systems, computed tomography for optical computing, concepts in distributed systems, optical signal processing, and white-light optical signal processing and its applications.

关键词： COMPUTER systems, DIGITAL

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Non-Bayesian optical inference machines

Non-Bayesian optical inference machines

引用

1986 International optical Computing conference

作者： Kadar, Ivan Eichmann, George Grumman Corporation Mail Stop B36-35 BethpageNY11714-3582 United States Department of Electrical Engineering City College of the City University of New York New YorkNY10031 United States

In a recent paper, Eichmann and Caulfield1 presented a preliminary exposition of optical learning machines suited for use in expert systems. In this paper, we extend the previous ideas by introducing learning as a means of reinforcement by information gathering and reasoning with uncertainty in a non-Bayesian framework2. More specifically, the non-Bayesian approach allows the representation of total ignorance (not knowing) as opposed to assuming equally likely prior distributions. The expert system framework decision aid learning scheme introduced in this paper consists of a perceptual reasoning machine. Current information derived from knowledge sources are collected and processed in a "gather/assess" module whose evidence functions and algorithms generate beliefs and hypothesis about the observations. The output of the gather/assess module is split between evidence interpretation and feedback to an "anticipate/plan" module which contains learning algorithms and knowledge bases in memory acquired from prior domain knowledge and learning updates from the gather/assess module. The output of the anticipate/plan module in turn drives the gather/assess module closing the feedback loop. The information derived from the anticipate/plan module consists of most likely associations among the anticipated and current functionals of the observations and the next best plans. The next best plans aid the selection of the knowledge sources while the most likely associations aid the selection of the support in evidential reasoning within the frame of discernment of the observations. This completes the "perceptual reasoning cycle" which is a form of learning by reinforcement. optical associative memory is utilized for the anticipation and planning knowledge bases and optical computing is used for evidential reasoning (part of the inference engine), based on Dempster/Shafer theory3, which handles the management of the uncertainty among the knowledge sources. optical computing architec

关键词： optical data processing

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Obstacle Detection algorithms for Low Altitude Flight

Obstacle Detection Algorithms for Low Altitude Flight

引用

American Control conference (ACC)

作者： Banavar Sridhar NASA Ames Research Center CA USA

This paper describes an approach to collision avoidance for rotorcraft flying at low altitudes. The method is based on extracting information from passive image-based sensors. These methods can be used to alert a pilo... 详细信息

关键词： Detection algorithms optical sensors Image motion analysis Safety Azimuth Data mining optical noise optical computing Infrared detectors Image sensors

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Robotic vision/Sensing for space applications

Robotic vision/Sensing for space applications

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IEEE International conference on Robotics and Automation (ICRA)

作者： K. Krishen R. de Figueiredo O. Graham Johnson Space Center Tracking and Communications Division Code EE NASA Texas Electrical and Computer Engineering Department Rice University Texas

In the past decade, vision/sensing systems techniques have received significant attention for applications in robotics and automation. The thrust of automation and robotics for space applications has been proposed for increased productivity, improved reliability, increased flexibility, higher safety, and for the performance of tasks unsuited to humans. These benefits can be insured through automating time-consuming tasks, increasing productivity/performance of crew-accomplished tasks, and performing tasks beyond the capability of the crew. This paper provides a review of efforts currently in progress at the NASA/Johnson Space Center and at Rice University, the accomplishments to date, and some of the anticipated future developments. Both systems and algorithms are discussed. The evolution of future vision/sensing is projected to include the fusion of multisensors ranging from microwave to optical with multimode capability to include position, attitude, recognition, and motion parameters. The algorithms for information extraction would incorporate aspects of intelligence and knowledge for the interpolation and extrapolation of the needed data. The key features of the overall system design will be small size and weight, fast signal processing, robust algorithms, and accurate parameter determination. These aspects of vision sensing will also be discussed in this paper.

关键词： Robot sensing systems Orbital robotics Robot vision systems Robotics and automation Signal processing algorithms Productivity optical signal processing Machine vision Product safety Humans

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