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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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3-D range sensor using fiber grating for recognition of autonomous mobile robot's passage space

3-D range sensor using fiber grating for recognition of auto...

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Proceedings of IEEE/RSJ International conference on Intelligent Robots and systems (IROS'94)

作者： A. Ohya E. Shoji S. Yuta Intelligent Robot Laboratory Institute of Information Sciences and Electronics University of Tsukuba Tsukuba Japan

A 3-D range sensor system for an autonomous mobile robot is reported. It is important for a mobile robot to recognize spaces of passage. In this sensor system, the passage space is detected with an active vision sensor using a fiber grating, laser diode, and CCD camera. The fiber grating vision sensor can easily obtain 3-D information about the object. In the authors' system, the object is the floor and the system measures the height of the floor. In this case the height is nearly equal to zero, so the robot can perceive that the measured area is passable. An image processing module using a transputer (T805) is developed for this purpose. In this paper, the principle of the sensor and the method for passage space recognition are presented. The hardware and software of the system for the authors' autonomous mobile robot "Yamabico" is presented. Experimental results are also presented.< >

关键词： optical fiber sensors Fiber gratings Sensor systems Mobile robots Diode lasers Charge coupled devices Robot vision systems Charge-coupled image sensors Cameras Robot sensing systems

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Real time, in situ measurement of film thickness with reflexion supported pyrometric interferometry (RSPI)

Real time, in situ measurement of film thickness with reflex...

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IEEE/SEMI conference and Workshop on Advanced Semiconductor Manufacturing

作者： F.G. Boebel B. Hertel H. Moller W. Preiss G. Ritter Fraunhofer Institute of Integrated Circuits and Systems Erlangen Germany Institut für Halbleiterphysik Frankfurt (Oder) GmbH Frankfurt Germany

Real time, in situ measurement of film thickness is of crucial importance for many manufacturing processes of high-end electronic and opto-electronic devices. Most in situ process control strategies depend heavily on large data bases of process and material parameters. With RSPI film thickness and temperature are evaluated together with optical material parameters in real time using the measured data only. Material and process parameters need not to be known for evaluation. In this paper we concentrate on real time, in situ determination of film thickness and optical constants by RSPI. Temperature measurements by RSPI are discussed elsewhere. As far as the physical measurement principle for film thickness is concerned, RSPI is identical to similar intensity based monochromatic interferometric methods like Dynamical optical Reflectivity (DOR), etc. The main progress made by RSPI compared to similar inteferometric methods concerns the evaluation algorithms, which made RSPI the only intensity based measurement approach so far suitable for in situ film thickness monitoring of multi-layer stacks and real time in situ evaluation of composition (via determination of optical constants). RSPI has been proven to be a suitable method for in situ monitoring of growth in silicon processing. Data from Si/sub (1-x)/Ge/sub x/ Rapid Thermal Chemical Vapour Deposition (RTCVD) growth on Si wafers as well as poly-Si on a Si wafer coated with 200 nm of Si/sub 3/N/sub 4/ are presented. Further experiments have been carried out during wet silicon oxidation. In most cases thickness resolution has been better than 0.5 nm. The in situ determination of optical constants by RSPI agrees within 1% with literature values.

关键词： Thickness measurement optical films optical interferometry optical materials Monitoring Silicon Manufacturing processes Optoelectronic devices Process control Temperature

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Vision-based behaviors for multi-robot cooperation

Vision-based behaviors for multi-robot cooperation

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IEEE International Workshop on Intelligent Robots and systems (IROS)

作者： Y. Kuniyoshi J. Rickki M. Ishii S. Rougeaux N. Kita S. Sakane M. Kakikura Autonomous Systems Section Intelligent Systems Division Electro Technical Laboratory Tsukuba Ibaraki Japan Autonomous Syst. Sect. Electrotech. Lab. Tsukuba Japan Tokyo Denki University Tokyo Japan Institut Informatique d''Entreprise France

This paper presents some advanced examples of reactive vision-based cooperative behaviors: 1) chasing and posing against another robot among others; 2) unblocking the path of another robot by removing an obstacle; and 3) passing an object from one to another. These behaviors are demonstrated using real mobile robots equipped with CCD cameras, in a complex environment, and with no central controller or explicit communication among the robots. The action observation is based on real time processing of optical flow analysis and stereo tracking. An extended behavior-based architecture for "cooperation by observation" is presented. The core extension consists of a mobile space buffer and an image space buffer with manipulable markers which control the internal flow of information, thereby coordinating parallel behaviors and achieving purposive tasks in complex and dynamic environments.< >

关键词： Robot kinematics Robot vision systems optical buffering Mobile robots Communication system control Charge coupled devices Charge-coupled image sensors Cameras Centralized control Mobile communication

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International conference on optical information processing

International Conference on Optical Information Processing

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International conference on optical information processing

ISBN: (纸本)9780819413109

The proceedings contain 142 papers. The topics discussed include: optical neural networks based on photorefractive beam fanning;photorefractive fiber storage, switching, interconnects, and the technological challenges;present capabilities in the use of optical information processing devices in the supercomputer architecture;new space-integrating acousto-optic correlator operating mode: linear filtering and forming of video-signals;parallel optoelectronic systems for computing and communications;optical commutation based on AO effects in Ti-diffused waveguides in LINBO3;chemically enhanced bacteriorhodopsin thin film spatial light modulator;integrated magnetooptic Bragg cell device modules for information processing;acoustooptoelectronical devises for processing of spread spectrum sygnals;integrated optical multichannel acousto-electro-optic device;and wideband (20MHz-160MHz) acoustooptical standing wave modulator for fluorometry and mode synchronization.

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REAL-WORLD COMPUTING PROGRAM - optical COMPUTING devices AND systems

REAL-WORLD COMPUTING PROGRAM - OPTICAL COMPUTING DEVICES AND...

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1993 International Joint conference on Neural Networks (IJCNN 93-Nagoya)

作者： YAJIMA, H ELECTROTECH LAB TSUKUBA 305JAPAN

ISBN: (纸本)0780314212

In the Real World Computing Program, optics provides new device technology as well as new architectures and new algorithms, which aims at flexible information processing by employing massively parallel and massively distributed processing. Classified into three categories is optical technology to be developed in the program. These are namely, optical interconnection, optical neural systems, and optical digital systems.

关键词： optical data processing

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SYNTHETIC DISCRIMINANT FUNCTIONS FOR IMPLEMENTATION ON ARBITRARILY CONSTRAINED devices 4

SYNTHETIC DISCRIMINANT FUNCTIONS FOR IMPLEMENTATION ON ARBIT...

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CONF ON optical information processing systems AND ARCHITECTURE 4

作者： CARLSON, DW KUMAR, BVKV Carnegie Mellon Univ. (United States)

The conventional Synthetic Discriminant Function (SDF) filters are complex-valued and thus cannot be accommodated on spatial light modulators that can represent only a subset of all possible values in the complex plan... 详细信息

ISBN: (纸本)0819409456

关键词： Spatial light modulators Image filtering Digital micromirror devices Detection and tracking algorithms Binary data Control systems Phase only filters Phase shift keying optical filters Transmittance

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Fundamental and technological limitations in optical processing and computing: algorithms, architectures, and devices

Fundamental and technological limitations in optical process...

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作者： Kyriakakis, Christos University of Southern California

学位级别：Ph.D.

In this thesis we investigate the fundamental energy requirements of optical processing and computing systems and assess their implied impact on the feasibility and optimization of potential algorithms, architectures and device configurations. These considerations are subsequently used to examine the possible advantages of analog optical processor implementations over their digital counterparts, and the resulting trade-offs between energy cost of representation, computational complexity and accuracy of calculations. The advantages of analog processors come from the inherent parallelism available in optical systems and the relative ease of implementation of analog interconnections. The goal of this investigation is twofold: to examine the physical and technological limitations that pertain to issues of representation, computation, and detection of information in such optical analog processors; and to demonstrate that such processors offer the potential of operation much closer to the fundamental boundaries than digital systems. The study of fundamental physical limitations of digital electronic systems is well established, and comparable studies of optical systems have exam ined such issues as they relate to digital optical computing. In the first half of this thesis we address fundamental and technological issues that pertain to ana log optical processing. Using energy as a metric with which to assess the over all cost of computation, we examine the fundamental requirements imposed by an analog data representation. It is of particular importance to determine both the type of data representation scheme and its physical implementation that maximize computational rate for a fixed input energy. We compare and contrast the inherently different limits derived for analog and digital implementations in order to determine which approach is more favorable from the point of view of a fixed input power budget at a given desired throughput computational rate. Our results show

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IMAGING THE INTERIOR OF THE BODY WITH ELECTRIC-FIELDS

IMAGING THE INTERIOR OF THE BODY WITH ELECTRIC-FIELDS

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CONF ON PHYSIOLOGICAL IMAGING, SPECTROSCOPY, AND EARLY-DETECTION DIAGNOSTIC METHODS

作者： CHENEY, M ISAACSON, D Rensselaer Polytechnic Institute (United States)

ISBN: (纸本)0819411140

In order to improve our ability to use electromagnetic fields to diagnose and treat disease, it would be helpful to know the electric conductivity in the interior of the body. In order to obtain this information, our group of Rensselaer has built devices, which we call Adaptive Current Tomograph (ACT) systems, that apply small currents to the body through electrodes stuck to the skin. The ACT systems measure the induced voltages, and send all the current and voltage information to the computer, which uses an algorithm to process the data and reconstruct approximate images of the conductivity and permittivity in the interior.

关键词： Reconstruction algorithms Data processing Electrodes Electromagnetism Diagnostics Heart Computing systems Image processing Imaging systems Skin

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PARALLEL IMAGE GENERATION FOR FAST LASER RECORDING

PARALLEL IMAGE GENERATION FOR FAST LASER RECORDING

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conferences on High-Resolution Cameras and Recording devices, and Laser Scanning and Recording systems

作者： LASURE, R VANCAMPENHOUT, J BARCO GRAPH B-9000 GHENTBELGIUM

ISBN: (纸本)0819412368

We have developed a parallel Raster Image Processor that generates the laser beam control information on-the-fly, obviating the need for image storage, and in real-time. The system exhibits a nearly linear speedup in the number of processors used: It is therefore possible to achieve the very high pixel rates requested by the laser recorder. The system is composed of a variable number of processors and can hence be scaled, depending on the speed of the laser recorder. The software architecture of the system allows transparent execution of a large class of sequential algorithms on the parallel hardware.

关键词： Image processing Raster graphics Visualization Computer programming Computing systems Image resolution Image storage Prototyping Imaging systems Laser applications

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Applications of complex-valued neural networks for coherent optical computing devices using phase sensitive detection

Applications of complex-valued neural networks for coherent ...

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Second International conference on Fuzzy Theory and Technology Proceedings, Abstracts and Summaries

作者： Hirose, Akira RCAST University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo 153 Japan Institute for Neuroinformatics University of Bonn Roemerstrasse 164 D-53117 Bonn Germany

Applications of complex-valued neural networks for optical signal processing using a phase sensitive detection scheme are discussed with fully optical systems and opto-electronic hybrid systems. It is found in this paper that, in the case of fully optical information processing systems, there is a possibility that many advantages of complex-valued neural networks are realized directly utilizing physical interaction of lightwave and materials. On the other hand, a hybrid system using both optical and electronic networks with O/E and E/O interface devices are more feasible in the present state of the art to construct a workable system. In the hybrid system, we can construct flexible networks making use of both the high-order parallelability of optical circuits and the memory function available easily in electronic circuits.

关键词： Neural networks

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