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Analysis of stochastic gradient identification of Hermite polynomial systems with memory

Analysis of stochastic gradient identification of Hermite po...

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International Symposium on signal processing and Its Applications (ISSPA)

作者： P. Celka N.J. Bershad J.M. Vesin Department of Electrical Engineering Signal Processing Laboratory Swiss Federal Institute of Technology Lausanne Switzerland Department of Electrical and Computer Engineering School of Engineering University of California Irvine CA USA

This paper presents analytical and Monte Carlo results for a stochastic gradient adaptive scheme which identifies an orthogonal polynomial-type nonlinear system with memory. The analysis includes recursions for the mean and fluctuation behavior of the adaptive parameters as well computation of the mean-square error increase due to the adaptation process.

关键词： Stochastic systems Polynomials Fluctuations Nonlinear filters Adaptive signal processing Taylor series Stochastic processes signal processing algorithms Vectors Australia

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User interaction in region-based color image segmentation 3rd

User interaction in region-based color image segmentation

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3rd International Conference on Visual Information Systems, VISUAL 1999

作者： Ikonomakis, Nicolaos Plataniotis, Kostas N. Venetsanopoulos, Anastasios N. Department of Electrical and Computer Engineering Digital Signal and Image Processing Lab University of Toronto 10 King’s College Road TorontoONM5S 3G4 Canada School of Computer Science Ryerson Polytechnic University 350 Victoria Street TorontoONM5B 2K3 Canada

ISBN: (纸本)3540660798

An interactive color image segmentation technique is presented for use in applications where the segmented regions correspond to meaningful objects, such as for image retrieval. The proposed technique utilizes the perceptual HSI (hue,saturation,intensity) color space. The scheme incorporates user interaction so that the best possible results can be achieved. Interaction with the user allows the segmentation algorithm to start efficiently and to refine the results. Interaction is performed for the key images (usually the first image or those where new ojects enter the scene) of the video-telephony sequence. The user is allowed to identify on the screen the relevant regions by marking their seeds. The user guidance can be given by the sender, by the receiver, or by both. The effectiveness of the algorithm is found to be much improved over techniques used in the past. © Springer-Verlag Berlin Heidelberg 1999.

关键词： image retrieval

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Design and implementation of narrow-band linear-phase FIR filters with piecewise polynomial impulse response

Design and implementation of narrow-band linear-phase FIR fi...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： T. Saramaki S.K. Mitra Signal Processing Laboratory Tampere University of Technology Tampere Finland Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

The transfer function of these filters is a parallel connection of several branches with transfer functions of the form G/sub l/(z/sup L/)F/sub l/(z), where the length of each F/sub l/(z) is L. It is shown that by properly selecting the F/sub l/(z)'s the overall impulse response can be divided into several blocks of L samples in such a manner that in each block the impulse response is a polynomial of a given degree. The degree is one less than the number of branches, whereas the overall length of the impulse response is N=ML, where M is the length of the G/sub l/(z)'s. Efficient implementation forms are proposed for the overall filter. Examples are included illustrating the efficiency of the proposed approach in implementing narrow-band linear-phase FIR filters.

关键词： Finite impulse response filter Narrowband Polynomials Transfer functions IIR filters Bandwidth Frequency signal processing Laboratories Digital filters

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Semi-interactive structure and fault analysis of (111)7×7 silicon micrographs 3rd

Semi-interactive structure and fault analysis of (111)7×7 s...

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3rd International Conference on Visual Information Systems, VISUAL 1999

作者： Androutsos, Panagiotis Ruda, Harry E. Venetsanopoulos, Anastasios N. Department of Electrical and Computer Engineering University of Toronto Digital Signal and Image Processing Lab 10 King’s College Road TorontoONM5S 3G4 Canada Department of Metallurgy and Materials Science University of Toronto Electronic Materials Group 184 College St. TorontoONM5S 3E4 Canada

ISBN: (纸本)3540660798

A new technique by which the electron micrographs of (111)7×7 Silicon are analyzed is discussed. In contrast to the conventional manner by which pseudocolor is introduced into normally gray scale surface scans, this method performs a high-level, knowledge based analysis to provide the viewer with additional information about the silicon sample at hand. Namely, blob recognition and analysis, as well as a priori knowledge of (111)7×7 Silicon can be utilized to delineate structural patterns and detect fault locations. The conveyance of information such as this is of much more consequence to an investigator interested in determining a sample’s uniformity and structure. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Silicon

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Round-off error free fixed-point design of polynomial FIR predictors

Round-off error free fixed-point design of polynomial FIR pr...

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Asilomar Conference on signals, Systems & computers

作者： J.M.A. Tanskanen V.S. Dimitrov Institute of Intelligent Power Electronics Department of Electrical and Communications Engineering Helsinki University of Technology Espoo Finland Laboratory of Signal Processing and Computer Technology Department of Electrical and Communications Engineering Helsinki University of Technology Espoo Finland

We present a novel method for designing polynomial FIR predictors for fixed-point environments. Our method yields filters that perform exact prediction of polynomial signals even with short coefficient word lengths. Under ordinary coefficient truncation or rounding, the prediction capability degrades, or may be totally lost. With the proposed method, the filters are designed so that the predictive properties are exactly preserved in fixed-point implementations. The proposed filter design method is based on integer programming (IP) and can be directly applied to any fixed-point FIR design specifications which can be formulated in a form of linear constraints on the filter coefficients.

关键词： Roundoff errors Polynomials Finite impulse response filter Design methodology Design engineering Power engineering and energy Degradation Nonlinear filters Filtering White noise

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Adaptive window random access algorithm with sequential detection capability for the capture environment

Adaptive window random access algorithm with sequential dete...

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IEEE International Conference on Personal Wireless Communication

作者： D.E. Ayyildiz H. Delic Dept. of Electr. & Electron. Eng. Bogazici Univ. Istanbul Turkey Signal and Image Processing Laboratory (BUSIM) Department of Electrical and Electronics Engineering Boğaziçi University Turkey

We propose an adaptive random access algorithm for mobile environments with capture. The algorithm has a dynamic window size which is updated according to the traffic intensity. The packet arrival rate is tracked by employing sequential detection procedures. Simulations indicate that changing the window size adaptively reduces the average delay under heavy load conditions.

关键词： Delay Fading Feedback signal processing Traffic control Shadow mapping Adaptive signal detection image processing Heuristic algorithms Solid modeling

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Generalized orthogonal subspace projection approach to multispectral image classification 4

Generalized orthogonal subspace projection approach to multi...

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image and signal processing for Remote Sensing IV 1998

作者： Ren, Hsuan Chang, Chein-I Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County 1000 Hilltop Circle BaltimoreMD21250 United States

ISBN: (纸本)9780819429599

Orthogonal subspace projection (OSP) has been successfully applied to hyperspectral image processing. In order for OSP to be effective, the number of bands must be no less than that of signatures to be classified so that there are sufficient dimensions to accommodate individual signatures to discriminate one another via orthogonal projection. This intrinsic constraint is not an issue for hyperspectral images since they generally have hundreds of bands which are more than the number of signatures resident within images. It, however, may not be true for multispectral images where the number of signatures to be classified is greater than the number of bands such as 3-band SPOT images. This paper presents a generalization of OSP, called generalized OSP (GOSP) to relax this constraint in such a fashion that OSP can be extended to multispectral image processing in an unsupervised fashion. The idea of GOSP is to create new additional band images nonlinearly from original multispectral images so as to achieve sufficient dimensionality prior to OSP classification. It is then followed by an unsupervised OSP classifier, called automatic target detection and classification algorithm (ATDCA) for classification. The effectiveness of the proposed GOSP is evaluated by a 3-band SPOT and a 4-band Landsat MSS images. The experimental results has shown that GOSP significantly improves the classification performance of OSP. © 1998 SPIE.

关键词： Landsat

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Sonar resolution-based environment mapping 15

Sonar resolution-based environment mapping

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15th IEEE International Conference on Robotics and Automation, ICRA 1998

作者： Cahut, Leyla Vlavanis, Kimon P. Delic, Hakan Robotics and Automation Laboratory Center for and Advanced Computer Studies University of Southwestern Louisiana LafayetteLA70504 United States Signal and Image Processing Laboratory Department of Electrical Engineering BogaziCi University Bebek 80815 Istanbul Turkey

ISBN: (纸本)078034300X

Ultrasonic range sensors are used to obtain the information required for collision-free navigation of a mobile robot in a semi-structured or unstructured environment. A set of range readings from a ring of sonars are correlated to acquire a 2D map of the robot's environment. The map is continuously enhanced via novel matching and update algorithms as new data are collected while the robot is in motion. The algorithm utilizes confidence measures that are directly obtained from the sonar's resolution or accuracy. There are no additional modeling assumptions and the approach is robust. The algorithms are experimentally tested on the Nomad 200 mobile robot and Nomad's Cognos Software Development Package. © 1998 IEEE.

关键词： Software testing

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Reversible wavelet and spectral transforms for lossless compression of color images

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 CA USA

ISBN: (纸本)0818688211

A new lossless image compression method for progressive-resolution transmission of color images is proposed. It is based on spatial and spectral transforms. Reversible wavelet transforms are performed across the red, green, and blue color components first. Then adaptive spectral transforms are applied to the associated color subbands. Simulation results indicate that the proposed algorithm can achieve bit rates that are about 20% lower than results obtained with comparable lossless image compression techniques supporting progressive-resolution transmission.

关键词： Wavelet transforms image coding Color Decorrelation signal resolution Propagation losses image storage signal processing image processing Laboratories

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Perceptual relevance of objectively measured descriptors for speaker characterization

Perceptual relevance of objectively measured descriptors for...

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1998 23rd IEEE International Conference on Acoustics, Speech and signal processing, ICASSP 1998

作者： Necioglu, Burhan F. Clements, Mark A. Barnwell, Thomas P. Schmidt-Nielsen, Astrid Center for Signal and Image Processing School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States Code 5513 Naval Research Laboratory 4555 Overlook Ave SW Washington DC 20375 United States

ISBN: (纸本)0780344286

Subjective testing of speaker recognizability is an intricate, time consuming and very expensive process, but using objectively measurable descriptors to augment the subjective speaker recognizability tests could result in increased efficiency and reliability. This paper describes our investigation into the relevancy of a set of objective descriptors to human perception of speaker identity through multidimensional scaling (MDS) of subjective speaker pair similarity judgments. The evaluated objective descriptors can achieve same/different detection error rates as low as 4.13% for male speaker pairs, and 8.17% for female speaker pairs, with only 3 seconds of speech. Five descriptors related to glottal, vocal tract and prosodic features were found to have significant correlations with the perceptual dimensions of the MDS solutions. © 1998 IEEE.

关键词： Subjective testing

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