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检索条件"机构=SignaVImage Processing Laboratory Department of Electrical and Computer Engineering"

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Adaptive LMS delay measurement in dual blood volume pulse signals for non-invasive monitoring [photoplethysmography]

Adaptive LMS delay measurement in dual blood volume pulse si...

引用

Southern Biomedical engineering Conference

作者： A.B. Barreto C.D. Aguilar E.E. Jakubzick Digital Signal Processing Laboratory Department of Electrical & Computer Engineering Florida International University Miami FL USA

The performance of two adaptive algorithms, the LMS and the adaptive delay algorithm, for measuring the actual delay between two blood volume pulse (BVP) signals is studied. Results are obtained from an experimental setup examined with several test signals as well as pairs of BVP signals for a subject's three different cardiovascular conditions.

关键词： Pulse measurements Least squares approximation Volume measurement Blood Monitoring Delay estimation Signal processing Cardiology Fingers Adaptive systems

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A statistical tomographic approach to synthetic aperture radar image reconstruction

A statistical tomographic approach to synthetic aperture rad...

引用

IEEE International Conference on Image processing

作者： M. Cetin W.C. Karl Multi Dimensional Signal Processing Laboratory Department of Electrical and Computer Engineering Boston University Boston MA USA

We formulate the spotlight-mode synthetic aperture radar (SAR) imaging problem as a maximum a posteriori (MAP) estimation problem. Our statistical perspective offers an alternative to standard SAR processing techniques by incorporating prior knowledge about either the data quality or the underlying reflectivity function. In our formulation we consider exploiting the similarity between computer assisted tomography (CAT) and spotlight-mode SAR, which was first exposed by Munson et al. (1983). We present the effectiveness of the proposed approach by imagery formed from simulated spotlight-mode SAR data.

关键词： Tomography Synthetic aperture radar Image reconstruction Reflectivity Chirp Radar imaging Signal processing algorithms Geometry Multidimensional signal processing Radar signal processing

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Wavelet based analysis of speech under stress

Wavelet based analysis of speech under stress

引用

IEEE Southeastcon

作者： R. Sarikaya J.N. Gowdy Digital Speech and Audio Processing Laboratory Department of Electrical and Computer Engineering Clemson University Clemson SC USA

Stress and its effects in speech signals have been studied by many researchers. A number of studies have been attempted to determine reliable acoustic indicators of stress using such speech production features as fundamental frequency (F0), intensity, spectral tilt, the distribution of spectral energy and others. The findings indicate that more work is necessary to propose a general solution. The goal of this study is to propose a new set of speech features based on dyadic wavelet transform (DyWT) coefficients as potential stress sensitive parameters. The parameters' ability to capture different stress types is evaluated on the basis of separability distance measure between parameters of each stress class for four stress conditions: neutral, loud, question and angry. After an extensive number of scatter distributions were considered a number of clear trends emerged that confirmed that the new speech parameters are well suited for stress classification.

关键词： Speech analysis Wavelet analysis Stress Signal analysis Speech processing Wavelet transforms Telephony Time frequency analysis Transient analysis Filter bank

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Nyquist filters in non-ISI transmission

Nyquist filters in non-ISI transmission

引用

Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Ping-Kuen Lam E.W. McCune M.A. soderstrand Department of Electrical and Computer Engineering Digital Signal Processing and Communications Laboratory University of California Davis Davis CA USA

By expressing the frequency response of a Nyquist filter as a convolution of two functions, the mathematical complexity required to find the impulse response of the filter is reduced. Moreover, more efficient Nyquist filters than the popular Raised Cosine filter (i.e. wider 3 dB bandwidth, same absolute bandwidth, and shorter or same length impulse response) are generated by using well known Window functions such as Ramming and Blackman.

关键词： Convolution Cutoff frequency Frequency response Bandwidth Transfer functions Digital signal processing Laboratories Digital filters Wireless communication Data communication

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Disparity estimation using rate-distortion theory for stereo image sequence coding

Disparity estimation using rate-distortion theory for stereo...

引用

International Conference on Digital Signal processing (DSP)

作者： D. Tzovaras M.G. Strintzis Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Aristotle University of Thessaloniki Thessaloniki GR

A rate-distortion framework is used to define a displacement vector-field estimation technique for use in video coding. This technique achieves maximum reconstructed image quality under the constraint of a target bit rate for the coding of the vector sequence. Use of this technique is evaluated for an application area in which the need for high compression of displacement vector fields is particularly acute. Specifically techniques are examined for the coding and transmission of disparity fields. This is needed for the generation at the receiver of intermediate view points by means of spatial interpolation. It is also needed in a number of other applications requiring accurate depth knowledge, including 3D medical data transmission and transmission of scenes that are going to be post processed using depth-keyed segmentation. Experimental results illustrating the performance of the proposed technique in these application areas are presented and evaluated.

关键词： Estimation theory Rate-distortion Image coding Video coding Image reconstruction Image quality Bit rate Interpolation Biomedical imaging Data communication

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A simulator construction methodology for the Shiva multiprocessor system 3

A simulator construction methodology for the Shiva multiproc...

引用

3rd International Conference on Algorithms and Architectures for Parallel processing, ICA3PP 1997

作者： Slomka, S. Sterzl, K.F. Lakshmi Narasimhan, V. Speech Research Laboratory Signal Processing Research Center Queensland University of Technology GPO Box 2434 BrisbaneQLD4001 Australia PA SE Research Laboratory Department of Electrical and Computer Engineering University of Queensland St. LuciaQLD4072 Australia Information Management Group ITD DSTO SalisburySA5108 Australia

ISBN: (纸本)0780342291

This paper describes a simulator for the Shiva multiprocessor system and the simulator construction methodology (SCM) used in its creation. The SCM, based on the active functional unit (AFU) construct, is a modern SCM which is flexible, accurate, fast, easy to use, capable of dynamic reconfigurability at run-time, and most of all simple and capable of quick simulator construction. The AFU SCM is capable of all these things through the use of object-oriented software techniques. The Shiva simulator constructed using the AFU SCM is program-driven and capable of micro and macro architectural simulation. © 1997 IEEE.

关键词： Multiprocessing systems

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Robustness of delta operator based cellular neural networks

Robustness of delta operator based cellular neural networks

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： B. Mirzai H.C. Reddy G.S. Moschytz Signal and Information Processing Laboratory Swiss Federal Institute of Technology Zurich Switzerland Department of Electrical and Computer Engineering University of California Irvine CA USA Department of Electrical Engineering California State University Long Beach CA USA

The delta operator approach to continuous-time cellular neural networks (CT-CNNs) is investigated in terms of a robust realization. It is shown that earlier results concerning the robustness of CT-CNNs can be obtained as a limiting case of this approach, while at the same time, this allows us to formulate robustness considerations for discrete-time CNNs.

关键词： Robustness Cellular neural networks Sampling methods Signal processing Limiting Nonlinear equations Information processing Laboratories computer networks Image processing

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Model-based detection and correction of corrupted wavelet coefficients

Model-based detection and correction of corrupted wavelet co...

引用

IEEE International Conference on Image processing

作者： N. Strobel S.K. Mitra B.S. Manjunath Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara USA University of California Santa Barbara Santa Barbara CA US

Image decomposition based on the discrete wavelet transform (DWT) has been proposed for efficient storage and progressive transmission of images for visual browsing in digital image libraries. Although the compression aspects of the DWT have been carefully researched, reconstruction errors due to corrupted wavelet coefficients have received less attention. In this paper we consider the problem of bit errors affecting uniformly quantized wavelet coefficients. The proposed method, which is based on a local image model, simultaneously detects and masks corrupted wavelet coefficients.

关键词： Wavelet coefficients Image coding Image reconstruction Discrete wavelet transforms Filters Decoding Error correction Image edge detection Signal processing Image processing

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The contrast pyramid based image code

The contrast pyramid based image code

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IEEE International Conference on Image processing

作者： Tian-Hu Yu Jianhua Chen S.K. Mitra Department of Information Engineering Chinese University of Hong Kong New Territories Hong Kong China Department of Electrical and Computer Engineering Signal and Image Processing Laboratory University of California Santa Barbara CA USA

In this paper, a contrast pyramid based image coding method is described in which a simple nonlinear difference operation is introduced to generate residual information between two contiguous level images. The representation of the residual information can be considered as a local contrast measure. As the difference image in established pyramid coding techniques, the contrast image has low variance, and data compression is achieved by quantizing the contrast image. Based on Weber's law and spatial masking of the human visual system, further data compression can be attained by selecting only perceptually significant information from the contrast image and coding it efficiently.

关键词： Image coding Laplace equations Low pass filters Data compression Humans Data structures Nonlinear filters Filtering Image generation Visual system

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Three-dimensional analytical and numerical solutions for acousto-optic interaction

Three-dimensional analytical and numerical solutions for aco...

引用

Southeastern Symposium on System Theory

作者： D.B. Dunn M. McNeill Jiangang Xia Ting-Chung Poon P.P. Banerjee Optical Image Processing Laboratory The Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University VA USA Department of Elec. Engineering Bucknell University USA York University Canada Center for Applied Optics Department of Electrical and Computer Engineering University of Alabama Huntsville Huntsville AL USA

The authors present an analytical solution to the strong acousto-optic interaction problem in three dimensions. They then compare the analytical results to a split-step numerical algorithm. The algorithm is based on t... 详细信息

关键词： Optical propagation Acoustic beams Transfer functions Diffraction Acoustic propagation USA Councils Gratings Image analysis Image processing Laboratories

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