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检索条件"任意字段=Wavelets - Applications in Signal and Image Processing X Conference"

共 4118 条记录，以下是4051-4060 订阅

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MICROPROCESSOR OPEN VISION ENVIRONMENT (MOVE)

MICROPROCESSOR OPEN VISION ENVIRONMENT (MOVE)

引用

conference on Computer Vision for Industry

作者： SKORDAS, T DEPAOLI, S ITMI (France) GEC (United Kingdom) INRIA (France) AIVRU (United Kingdom) LTIRF-INPG (France)

ISBN: (纸本)0819412384

MOVE is one of the ESPRIT III OMI feasibility studies projects is Vision/Robotics for industrial applications. The objective of MOVE is to study a modular environment specifically designed for the field of Computer Vision, which permits the integration of heterogeneous processors and of specific software. This environment is open -- it allows integration of existing and future processors, actuators and visual sensors -- and it facilitates communication with the external world. It is used directly in the design of a set of industrial vision applications which correspond to real requirements and therefore it facilitates product development and make it cost effective. There are many areas of industry and commerce where application of machine vision would make an important impact on productivity and product quality, but the progress has been slow because of the lack of a suitable high-performance low-cost hardware. This paper gives some elements on how MOVE intends to provide the needed solution.

关键词： Machine vision Telecommunications Software development Algorithm development Computer vision technology Data communications Operating systems Standards development Digital signal processing image processing

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Fifth International conference on Laser Anemometry

Fifth International Conference on Laser Anemometry

引用

Fifth International conference on Laser Anemometry

ISBN: (纸本)0819413119

This conference proceedings contains 85 papers on applications of laser Doppler anemometry (LDA), laser Doppler velocimetry and other turbulent flow measurement techniques. Topics discussed include signal processing, instrumentation and new techniques, sprays and two-phase flows, biological and medical applications, high-speed flows, flow fields around buildings, laser safety in laser anemometry, the theory and applications of particle image velocimetry, comparisons of LDA measurements and computational fluid dynamics simulation, integral Doppler anemometry, laser global velocimetry, studies of combustion using LDA, and LDA measurements of swirling flows and diesel engine gas flows.

关键词： Flow measurement

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Linear phase orthonormal filter banks

Linear phase orthonormal filter banks

引用

International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： A.K. Soman P.P. Vaidyanathan T.Q. Nguyen EE Department Cal Tech Pasadena CA USA EE Dept. California Inst. of Technol. Pasadena CA USA MIT Lincoln Laboratories Lexington MA USA

Paraunitary systems in which each individual filter in the analysis and synthesis banks has linear phase are studied. This property is often desirable for several applications, particularly in image processing. Several theoretical questions pertaining to linear phase paraunitary systems are answered. Next, a factorization for such systems is developed which is proved to be minimal as well as complete. The number of parameters in the optimization process is reduced by structurally imposing the additional condition that the filters satisfy pairwise mirror-image symmetry in the frequency domain. Examples of M-band linear phase orthonormal wavelets are presented.< >

关键词： Channel bank filters Finite impulse response filter Filter bank Nonlinear filters Matrix decomposition signal synthesis Frequency domain analysis image reconstruction image coding Filtering theory

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COMPUTER-SIMULATION OF A SMALL SATELLITE SENSOR FOR FORESTRY applications

COMPUTER-SIMULATION OF A SMALL SATELLITE SENSOR FOR FORESTRY...

引用

conference on Recent Advances in Sensors, Radiometric Calibration, and processing of Remotely Sensed Data

作者： MONTPETIT, MJ BHARADWAJ, P SPAR AEROSP LTD DIV SATELLITE & COMMUN SYSTST ANNE BELLEVUE H9X 3R2PQCANADA

ISBN: (纸本)0819411744

The need for low-cost, high quality and application-targeted spaceborne sensing is rapidly gaining in prominence. In response to this need, Spar Aerospace Limited is a major contributor to PROGERT, a Quebec-Government funded project to enhance remote sensing services to the provincial forestry user community. The computer simulation of advanced electro-optical concepts is being performed at Spar in PROGERT and applied to the development of a new satellite imaging instrument. As part of the overall design strategy, Spar is developing a model, based on forest physical parameters and standard sensor sub-systems. The purpose of this model is to explore system-level trade-offs in the early design phases thus reducing costly hardware development. In particular, the use of this model allows optimal specification of data acquisition parameters within the constraints of mission and end-user requirements.

关键词： Sensors Modulation transfer functions CCD image sensors Computer simulations signal to noise ratio Data acquisition Electrons Satellites Data modeling Forestry

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Wavelet regularity of iterated filter banks with rational sampling changes

Wavelet regularity of iterated filter banks with rational sa...

引用

International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： T. Blu O. Rioul CRPE (Unité mixte CNRS/CNET) CNET Paris B France Télécom Issy-les-Moulineaux France

The regularity property was first introduced by wavelet theory for octave-band dyadic filter banks. In the present work, the authors provide a detailed theoretical analysis of the regularity property in the more flexible case of filter banks with rational sampling changes. Such filter banks provide a finer analysis of fractions of an octave, and regularity is as important as in the dyadic case. Sharp regularity estimates for any filter bank are given. The major difficulty of the rational case, as compared with the dyadic case, is that one obtains wavelets that are not shifted versions of each other at a given scale. It is shown, however, that, under regularity conditions, shift invariance can almost be obtained. This is a desirable property for, e.g. coding applications and for efficient filter bank implementation of a continuous wavelet transform.< >

关键词： Channel bank filters Sampling methods Filter bank Finite impulse response filter Continuous wavelet transforms Wavelet transforms image sampling signal analysis Low pass filters image coding

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processing and Packaging of Semiconductor Lasers and Optoelectronic Devices

Processing and Packaging of Semiconductor Lasers and Optoele...

引用

processing and Packaging of Semiconductor Lasers and Optoelectronic Devices

ISBN: (纸本)0819410772

The conference contains 16 articles dealing with the following subjects: buried heterostructure lasers based on InGaAsP/InP;fabrication processes for GaAs-based high-power diode lasers;fast and reliable processing of high-performance InGaAs laser diodes;buried crescent lasers with narrow spread of threshold currents;packaging technologies;Si-based laser subassembly for telecommunications;inexpensive packaging techniques of fiber pigtailed laser diodes;high-performance packaging of gigabit data communication optical modules;applications of diamond made by CVD for semiconductor laser submounts;packaging of optical interconnect arrays for optical signal processing and computing;surface emitters and novel processes;vertical-cavity surface-emitting laser technology;molecular beam epitaxy technology for selective area embedded InGaAs layers in InP substrates;direct contact type image sensor unit.

关键词： Semiconductor lasers

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Beyond 2000-Imaging for automated production test of PCB assemblies

Beyond 2000-Imaging for automated production test of PCB ass...

引用

International conference on Acoustics, Speech, and signal processing (ICASSP)

作者： J.A. Adams Fourier Systems San Diego CA USA

The author highlights current applications for imaging and image analysis as used in the printed circuit board (PCB) assembly process and suggests areas of needed improvement in both acquisition and analysis. Imaging is used on PCB assembly lines to meet the demanding placement requirements of the modern components, to identify proper component and orientation, to confirm the proper application of solder paste, to verify soldering, and to test the final assembly. Current imaging techniques from ultrasound, visual, infrared, laser, and x-ray all need to improve to keep up with the demands from the marketplace. The discussion of imaging techniques is restricted to two-dimensional spatial imaging with the third dimension typically representing other information, such as height, temperature, thickness, color, or position. Better price performance is needed for future growth of bond electronics assembly and for vision.< >

关键词： Production Automatic testing Assembly Ultrasonic imaging Optical imaging x-ray lasers Circuit testing image color analysis Printed circuits image analysis

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The effect of DSP on the point spread function of a sonar beamformer

The effect of DSP on the point spread function of a sonar be...

引用

International conference on Acoustic Sensing and Imaging, 1993.

作者： J.G. Paul R. McHugh S. Shaw Heriot-Watt University UK

In order to characterise the performance of a sonar beamformer due to the digital signal processing algorithm, the analogy with a 1-dimensional temporal linear system is important. In essence, a 1D linear system can be characterised by its impulse response, h(t), and (by convolution) the response of the system, y(t), can be evaluated from the input, x(t). The beamformer analogy relies on the fact that a sonar beamformer (with a 1D array) is effectively a 2-dimensional linear system where the input x(x,y) is modified by the imaging system transfer function, H(x,y), to give a 2D image at the output, Y(x,y). The imaging system transfer function is its impulse response to x(x,y)= delta (x,y), or a point source. H(x,y) is also known as the point spread function (PSF), which can be expressed in any coordinate framework. The beamformer PSF can then be evaluated in simulation by considering the effect of varying parameters in the DSP/beamformer algorithm, and noting their effect. This work discusses the effect on the PSF of varying the most significant digital signal processing, parameters in the Heriot-Watt focused beamformer. An introduction to the hardware prototype demonstrator and future applications of this sonar is also presented.< >

关键词： Acoustic signal processing Sonar

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Design of a three-dimensional boundary detector

Design of a three-dimensional boundary detector

引用

International conference on Industrial Electronics, Control and Instrumentation

作者： Shiming Zhan R. Mehrotra Department of Computer Science University of Kentucky Lexington KY USA

Three-dimensional (3D) image processing and interpretation is very important in many medical and industrial applications. Detection of 3D boundaries is an essential step in most of the 3D image analysis tasks. In this paper a new computational approach to 3D edge detection is proposed. Optimality criteria such as signal-to-noise ratio, localization and spurious response for zero-crossing-based, rotationally invariant 3D step edge detectors are derived. An optimal 3D step edge detector is obtained by optimizing a penalty function which combines all the three criteria. The closed form solution to the optimization problem yields the optimal detector. The detector is the Laplacian of a rotationally invariant function, which has a finite spatial support. The behavior of the proposed detector is theoretically analyzed and compared to that of the 3D Laplacian of Gaussian detector. Experimental results with some synthetic and real images are presented.< >

关键词： image edge detection Laplace equations x-ray detection x-ray detectors Ultrasonic imaging x-ray imaging Computed tomography Positron emission tomography Computer science Biomedical imaging

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The Aladdex operating system for the Aladdin multiprocessor

The Aladdex operating system for the Aladdin multiprocessor

引用

1993 conference on TRI-Ada, TRI-Ada 1993

作者： Krantz, Don Belt, Ron Gunderson, Steve Shenoy, Belle Vojta, Mark Alliant Techsystems Inc. 600 2nd St. NE HopkinsMN55343 United States

ISBN: (纸本)0897917219

This paper addresses the requirements, design, and implementation of the Aladdex Ada operating system for the Aladdin Multiprocessor. The Aladdin processor is an ARPA-sponsored development intended to pack one GELOPS into a soupcan-sized package. The final hardware configuration has over 2 GFLOPS plus 1 GOPS (peak) throughput in a 4.5x6-inch cylinder. Hie basic processor is composed of from 2 to 64 Texas Instruments 320C30 digital signal processors plus additional single-imtruction-multiple-data (SIMD) coprocessors. The Aladdex operating system was developed for this processor to support data flow applications such as image understanding and target tracking. Aladdex is written from scratch and is almost entirely in Ada (about 6000 lines of Ada with about 75 lines of assembly language to interface interrupt service routines). Aladdex was implemented and tested during the summer and fall of 1992. Aladdex has four major components plus support components. The major components are a Communications Manager, a Service Manager, a Fault Manager, and a debugger kernal. The Aladdin project also developed multiprocessor CASE tools, such as task partitioning and mapping tools, but they are beyond the scope of this paper. The Communications Manager transparently passes messages between tasks either on the same node or on remote nodes. Messages are based on discriminated records with the message ID as die discriminant, and full advantage is taken of Ada typing for protection. The Communications Manager can be used without the Service Manager and Fault Manager components in non-data-flow applications. The Service Manager routes messages between tasks working on different parts of a pipelined problem. One Service Manager is resident on each 'C30 processing node, and each Service Manager communicates with counterparts on other nodes. The Service Manager keeps data synchronized in "frames," to prevent data in a fast branch of a parallel pipeline from getting ahead of data in a slow b

关键词： Digital signal processors

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