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共 465 条记录，以下是181-190 订阅

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Multi-scale blind deconvolution of sensor array signals via scale transform

Multi-scale blind deconvolution of sensor array signals via ...

引用

Conference on advanced signal processing algorithms, architectures, and implementations IX

作者： Izzetoglu, M Akgül, T Drexel Univ Dept Elect & Comp Engn Philadelphia PA 19104 USA

ISBN: (纸本)0819432938

In this paper we introduce a. multi-scale deconvolution technique performed in the scale-domain. In sensor array applications such as in radar, sonar and seismic processing, the sensor outputs are modeled as the convolution of the unknown source signal with various unknown system impulse responses that are scaled versions of each other with unknown scale parameters. In many applications these signals or the scaling parameters are needed to be estimated only from the sensor outputs. In our earlier work, we estimated the unknown scale parameters by using properties of the scale transform and then employed existing deconvolution algorithms. Here, we derive the multiscale blind deconvolution algorithm in the scale transform domain. The performance of the method is illustrated using simulation examples.

关键词： Sensors Deconvolution Reflectors Convolution signal processing Algorithm development Computer simulations Electronic filtering Image processing Radar

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Multilinear algebra for independent component analysis

Multilinear algebra for independent component analysis

引用

Conference on advanced signal processing algorithms, architectures, and implementations IX

作者： McWhirter, JG Clarke, IJ Spence, G Def Evaluat & Res Agcy Malvern WR14 3PS Worcs England

ISBN: (纸本)0819432938

It is shown how some simple multilinear transformations may be used to generate an alternative, and potentially faster, version of the BLISS algorithm for blind signal separation. The BLISS algorithm performs an independent component analysis of the type proposed by Comon but uses a different method for estimating the pairwise rotation angles. It has been applied to a wide range of communication signals and proved extremely successful in practice. The reformulated version of BLISS requires less arithmetic operations provided the number of signals to be separated is fairly small (similar to 3 to 5) as found in a range of important communication scenarios.

关键词： multilinear algebra independent component analysis higher order statistics blind signal separation

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Parallel implementation of a face location algorithm on DSP's with SynDEx environment

Parallel implementation of a face location algorithm on DSP'...

引用

Conference on advanced signal processing algorithms, architectures, and implementations IX

作者： Yang, F Paindavoine, M Abdi, H Univ Burgundy Lab Le2i Fac Sci Mirande F-21011 Dijon France

ISBN: (纸本)0819432938

The aim of our work is to implement a system of automatic face image processing on DSP's : face detection in an image, face recognition and face identification. The first step is to localize the face in an image. Our approach consists to approximate the face oval shape with an ellipse and to compute coordinates of the center of the ellipse. For this purpose, we explore a new version of the Hough transformation : the Fuzzy Generalized Hough transformation. To reduce the computation time, we present also several parallel implementations of the algorithm on a multi-DSP architecture using SynDEx tool which is a programming environment to generate optimized distributed real-time executives. We show that an acceleration of factor 1.7 has been obtained.

关键词： automatic face image processing face location edge detection Hough transformation efficient mapping algorithm and architecture A(3) methodology SynDEx

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Image processing and low discrepancy sequences

Image processing and low discrepancy sequences

引用

Conference on advanced signal processing algorithms, architectures, and implementations IX

作者： Nair, D Wenzel, L Natl Instruments Austin TX 78727 USA

ISBN: (纸本)0819432938

It is well known that high-dimensional integrals can be solved with Monte Carlo algorithms. Recently, it was discovered that there is a relationship between low discrepancy sets and the efficient evaluation of higher-dimensional integrals. Theory suggests that for midsize dimensional problems, algorithms based on low discrepancy sets should out perform all other existing methods by an order of magnitude in terms of the number of sample points used to evaluate the integrals. We show that the field of image processing can potentially take advantage of specific properties of low discrepancy sets. To illustrate this, we applied the theory of low discrepancy sequences to some relatively simple image processing and computer vision related operations such as the estimation of gray level image statistics, fast location of objects in a binary image and the reconstruction of images from a sparse set of points. Our experiments show that compared to standard methods, the proposed new algorithms are faster and statistically more robust. Classical low discrepancy sets based on the Halton and Sobol' sequences were investigated thoroughly and showed promising results. The use of low discrepancy sequences in image processing for image characterization, understanding and object recognition is a novel and promising area for further investigation.

关键词： sampling random sampling low-discrepancy sequences image statistics image reconstruction

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Very low-noise (switching free) CNN-based adder

Very low-noise (switching free) CNN-based adder

引用

Conference on advanced signal processing algorithms, architectures, and implementations IX

作者： Sadeghi-Emamchaie, S Jullien, GA Miller, WC Univ Windsor VLSI Res Grp Windsor ON N9B 3P4 Canada

ISBN: (纸本)0819432938

This paper presents novel methods of designing analog Cellular Nonlinear (Neural) Networks (CNNs) to implement very low-noise binary addition. In these techniques the continuous characteristic of the current that charges (discharges) the load capacitor leads to a virtually switching free addition process that significantly reduces the switching noise. This switching mechanism also leads to higher slew of output voltage during the transitions which in turn reduces the cross talk. Simulation results demonstrate a three orders of magnitude reduction in the noise generated by this structure compared to that generated by a digital adder running at the same speed. This very good noise performance of these new adder structures makes them suitable choices for low to moderate speed high precision mixed signal applications.

关键词： Cellular Nonlinear Networks switching noise mixed-signal IC analog design low-noise digital adder

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Convolution theorems: partitioning the space of integral transforms: ii

Convolution theorems: partitioning the space of integral tra...

引用

Proceedings of the 1999 advanced signal processing algorithms, architectures, and implementations IX

作者： Suter, Bruce W. Lindsey, Alan R. Air Force Research Lab Rome United States

Investigating a number of different integral transforms uncovers distinct patterns in the type of scale-based convolution theorems afforded by each. It is shown that scaling convolutions behave in quite a similar fashion to translational convolution in the transform domain, such that the many diverse transforms have only a few different forms for convolution theorems. The hypothesis is put forth that the space of integral transforms is partitionable based on these forms.

关键词： signal processing

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High-performance signal and image processing for remote sensing using reconfigurable computers

High-performance signal and image processing for remote sens...

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Proceedings of the 1999 advanced signal processing algorithms, architectures, and implementations IX

作者： Caffrey, Michael Szymanski, J.J. Begtrup, A. Layne, J. Nelson, T. Robinson, S. Salazar, A. Theiler, J. Los Alamos Natl Lab Los Alamos United States

It is not uncommon for remote sensing systems to produce in excess of 100 Mbytes/sec. Los Alamos National Laboratory designed a reconfigurable computer to tackle the signal and image processing challenges of high bandwidth sensors. Reconfigurable computing, based on field programmable gate arrays, offers ten to one hundred times the performance of traditional microprocessors for certain algorithms. This paper discusses the architecture of the computer and the source of performance gains, as well as an example application. The calculation of multiple matched filters applied to multispectral imagery, showing a performance advantage of forty-five over Pentium ii (450 MHz), is presented as an exemplar of algorithms appropriate for this technology.

关键词： Image processing

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Context-driven partitioning of signaling energy (CDPSE) to help counter interference in wireless communications

Context-driven partitioning of signaling energy (CDPSE) to h...

引用

Proceedings of the 1999 advanced signal processing algorithms, architectures, and implementations IX

作者： Hershey, John Hladik, Stephen M. Korkosz, Richard A. General Electric Corp Research & Development Cent Niskayuna United States

The idea is (i) to use a variable energy allocation per signaling symbol and (ii) to pseudorandomize the order in which signaling symbols are transmitted. This strategy will allow the most important part of the sensor data to be (i) decorrelated against periodic unequal power interfering noise and specifically (ii) where that noise is purposely tailored or allocated in an attempt to provide maximum disruption of information transport as in 'smart' jamming. In a very real sense, perfect compression followed by this method leads to a genre of spread spectrum known as Time Hopping (TH).

关键词： signal processing

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Fast algorithms for Cauchy-Vandermonde matrices with multiple poles

Fast algorithms for Cauchy-Vandermonde matrices with multipl...

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Proceedings of the 1999 advanced signal processing algorithms, architectures, and implementations IX

作者： Martinez, J.J. Pena, J.M. Universidad de Alcala Madrid Spain

Cauchy-Vandermonde matrices are related with rational interpolation problems. In this paper we consider the general case in which multiple poles can appear. Fast algorithms for solving the corresponding linear systems... 详细信息

关键词： signal processing

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Fault-tolerant arithmetic via time-shared TMR

Fault-tolerant arithmetic via time-shared TMR

引用

Proceedings of the 1999 advanced signal processing algorithms, architectures, and implementations IX

作者： Swartzlander Jr., Earl E. Univ of Texas at Austin Austin United States

Fault tolerance is increasingly important as society has come to depend on computers for more and more aspects of daily life. The current concern about the Y2K problems indicates just how we much we depend on accurate computers. This paper describes work on time-shared TMR, a technique which is used to provide arithmetic operations that produce correct results in spite of circuit faults.

关键词： Digital signal processing

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