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检索条件"任意字段=Conference on Advanced Signal Processing - Algorithms, Architectures, and Implementations VII"

共 130 条记录，以下是41-50 订阅

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Feature preserving lossy image compression using nonlinear PDE's

Feature preserving lossy image compression using nonlinear P...

引用

SPIE conference on advanced signal processing algorithms, architectures, and implementations viiI

作者： Chan, TF Zhou, HM Univ Calif Los Angeles Dept Math Los Angeles CA 90095 USA

ISBN: (纸本)0819429163

In this report, we propose combining the Total Variation denoising method with the high loss wavelet compression for high noise level images. Numerical experiments show that TV-denoising can bring more wavelet coefficients closer to zero thereby making the compression more efficient while the salient features (edges) of the images can still be retained.

关键词： Image compression Wavelets Denoising Tolerancing Wavelet transforms Image processing Image quality Palladium Automatic target recognition Image storage

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Approach to regularization preconditioners for image processing

Approach to regularization preconditioners for image process...

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conference on advanced signal processing algorithms architectures and implementations XIII

作者： Estatico, C Univ Genoa Dipartmento Matemat I-16146 Genoa Italy

ISBN: (纸本)0819450782

Preconditioning techniques for linear systems are widely used in order to speed up the convergence of iterative methods. Unfortunately, linear systems arising in image processing are highly ill-conditioned and preconditioners often give bad results, since the noise components on the data are strongly amplified already at the early iterations. In this work, we propose filtering strategies which allow to obtain preconditioners with regularization features for Toeplitz systems of image deblurring. Regularization preconditioners are able to speed up the convergence in the space less sensitive to the noise and, simultaneously, they slow down the restoration from components mainly corrupted by noise. A 2-d numerical simulation concerning astronomical image deblurring confirms the effectiveness of the arguments.

关键词： preconditioning ill-conditioning regularization approximation operators Toeplitz matrices

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Proceedings of SPIE: advanced signal processing algorithms, architectures, and implementations XIII

Proceedings of SPIE: Advanced Signal Processing Algorithms, ...

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advanced signal processing algorithms, architectures, and implementations

This Volume 5205 of the conference proceedings contains 59 papers. Topics discussed include time frequency and time scale analysis, adaptive sensor network, wireless communication, image processing, exploitation of structured in imaging and signal processing, matrix algorithms, signal processing applications, computer arithmetic and arithmetic and architectures for real time applications.

关键词： Optical engineering

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Denoising using time-frequency and image processing methods

Denoising using time-frequency and image processing methods

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

作者： Nelson, D Cristóbal, G Kober, V Cakrak, F Loughlin, P Cohen, L US Dept Def Ft Meade MD 20755 USA

ISBN: (纸本)0819432938

We present a number of methods that use image and signed processing techniques for removal of noise from a signal. The basic idea is to first construct a time-frequency density of the noisy signal. The time-frequency density, which is a function of two variables, can then be treated as an "image", thereby enabling use of image processing methods to remove noise and enhance the image. Having obtained an enhanced time-frequency density, one then reconstructs the signal. Various time frequency-densities are used and also a number of image processing methods are investigated. Examples of human speech and whale sounds are given. In addition, new methods are presented for estimation of signal parameters from the time-frequency density.

关键词： Electronic filtering Interference (communication) Fourier transforms Time-frequency analysis Frequency modulation Fermium Transform theory signal processing Optical filters Filtering (signal processing)

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A BER analysis of a space-time signal processing scheme that combines transmitter diversity with beamforming

A BER analysis of a space-time signal processing scheme that...

引用

conference on advanced signal processing algorithms architectures and implementations XIII

作者： Kim, I Chun, J Korea Adv Inst Sci & Technol Comp Sci Lab Dept EECS Taejon 305701 South Korea

ISBN: (纸本)0819450782

We introduce a new space-time signal processing scheme that uses both transmitter diversity technique and beamforming technique for code-division multiple access (CDMA) systems. The introduced scheme achieves the diversity gain over Rayleigh fading channel through the transmitter diversity technique, and the signal-to-noise ratio (SNR) gain by the beamforming technique. Bit error rate (BER) analyses are given each of the three cases in which the transmitter diversity, beamforming and introduced combined scheme are used, in the frequency-flat Rayleigh fading channel. The analytic results are shown to coincide with the Monte-Carlo simulation results. We show that the combined scheme is more robust to the channel correlation and the speed of mobile than the diversity and beamforming scheme. Furthermore, the combined scheme gives a reduced multiple-access-interference because of its beamforming capability.

关键词： diversity beamforming space-time spreading CDMA

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Proceedings of SPIE: advanced signal processing algorithms, architectures, and implementations viiI

Proceedings of SPIE: Advanced signal processing algorithms, ...

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Advance signal processing algorithms, Atchitectures, and implementations viiI

The proceedings contains 58 papers from the conference of SPIE: advanced signal processing algorithms, architectures, and implementations viiI. The topics discussed include: blind channel identification and extraction of more sources than sensors;blind channel estimation for CDMA systems with orthogonal modulation;blind equalization and source separation with MSK inputs and adaptive blind channel estimation by least-squares smoothing for CDMA.

关键词： signal processing

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Implementation of pattern recognition algorithm based on RBF neural network

Implementation of pattern recognition algorithm based on RBF...

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conference on advanced signal processing algorithms, architectures and implementations XII

作者： Bouchoux, S Brost, V Yang, F Grapin, JC Paindavoine, M Univ Burgundy Lab LE2I Fac Sci Mirande Aile Ingenieur F-21011 Dijon France

ISBN: (纸本)0819445584

In this paper, we present implementations of a pattern recognition algorithm which uses a RBF (Radial Basis Function) neural network. Our aim is to elaborate a quite efficient system which realizes real time faces tracking and identity verification in natural video sequences. Hardware implementations have been realized on an embedded system developed by our laboratory. This system is based on a DSP (Digital signal Processor) TMS320C6x. The optimization of implementations allow us to obtain a processing speed of 4.8 images (240 x 320 pixels) per second with a correct rate of 95% of faces tracking and identity verification.

关键词： RBF neural network face tracking and identity verification DSP TMS320C6x real-time image processing embedded system

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Characterization of near-field scattering using a multiple weighted summed beamformer

Characterization of near-field scattering using a multiple w...

引用

conference on advanced signal processing algorithms, architectures and implementations XII

作者： Frazer, GJ Amin, MG Defence Science and Technology Organisation (Australia) Villanova Univ. (United States)

ISBN: (纸本)0819445584

The Sensor-Angle Distribution (SAD) is a recently introduced tool representing the power arriving at each sensor as a function of angle (or spatial frequency). It can be used to characterize near-field scatter environments. The SAD, as originally introduced, under-sampled the spatial correlation of the received signal (measured at each sensor) causing the SAD to be aliased for common source location cases. In this paper we indicate how this may be overcome. Additional results are provided showing that the SAD may be implemented as a multiple weighted subarray beamformer.

关键词： near-field sensor-angle distribution beamforming array processing

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advanced signal processing algorithms, architectures, and implementations II

Advanced Signal Processing Algorithms, Architectures, and Im...

引用

advanced signal processing algorithms, architectures, and implementations II

The Volume contains 44 conference papers. The topic covered include Toeplitz matrices, time-frequency distribution and nonstationary signals, bit-level systolic arrays and computer arithmetic, radar signal processing,... 详细信息

ISBN: (纸本)0819406945

关键词： signal processing

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Design and evaluation of on-line arithmetic for signal processing applications on FPGAs

Design and evaluation of on-line arithmetic for signal proce...

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conference on advanced signal processing algorithms, architectures, and implementations XI

作者： Galli, R Tenca, AF Oregon State Univ Dept Elect & Comp Engn Corvallis OR 97331 USA

ISBN: (纸本)0819441880

This paper shows the design and the evaluation of on-line arithmetic modules for the most common operators used in DSP applications, using FPGAs as the target technology. The designs are highly optimized for the target technology and the common range of precision in DSP. The results are based on experimental data collected using CAD tools. All designs are synthesized for the same type of devices (Xilinx XC4000) for comparison, avoiding rough estimates of the system performance, and generating a more reliable and detailed comparison of on-line signal processing solutions with other 'state of the art' approaches, such as distributed arithmetic. We show that on-line designs have a hard stand for basic DSP applications that use only addition and multiplication. However, we also show that on-line designs are able to overtake other approaches as the applications become more sophisticated, e.g. when data dependencies exist, or when non constant multiplicands restrict the use of other approaches.

关键词： on-line arithmetic signal processing DSP FPGA Xilinx XC4000

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