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检索条件"主题词=change detection algorithms"

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Integration of foot-mounted inertial sensors into a Bayesian location estimation framework

Integration of foot-mounted inertial sensors into a Bayesian...

引用

Workshop on Positioning, Navigation and Communication, WPNC

作者： Bernhard Krach Patrick Robertson German Aerospace Center DLR Institute of Communications and Navigation Wessling Germany

An algorithm for integrating foot-mounted inertial sensors into a Bayesian location estimation framework is presented. The proposed integration scheme is based on a cascaded estimation architecture. A lower Kalman filter is used to estimate the step-wise change of position and direction of the foot. These estimates are used in turn as measurements in an upper particle filter, which is able to incorporate nonlinear map-matching techniques. Experimental data is used to verify the proposed algorithm.

关键词： Bayesian methods Foot State estimation Accelerometers Particle measurements Particle filters change detection algorithms Satellite navigation systems Aerodynamics Sensor systems

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A Motion Dependent Vector Quantizer With Multiple Sub-code Books For Image Coding

A Motion Dependent Vector Quantizer With Multiple Sub-code B...

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Inseop Lee Jong Gyu Kim S. Halozan Souguil J.M. Ann Gold Star North America Laboratory Chicago IL USA Zenith Electronics Company Glenview IL USA Seoul National University Seoul South Korea

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Infared Target Extraction in FLIR Imagery Based on Spatio Temporal Using Fuzzy Clustering

Infared Target Extraction in FLIR Imagery Based on Spatio Te...

引用

International Symposium on Intelligent Information Technology Application, IITA

作者： Junshan Li Deqin Shi Wei Yang Xian Research Institute Xi'an China

A novel fuzzy clustering based target extraction algorithm for FLIR imagery using spatio-temporal technique is presented. Firstly, in temporal domain, we establish the Gauss distribution model of frame difference background by incorporating the motion information of the target. And then, the infrared target region is determined based on change detection mask. Secondly, in spatio domain, the improved fuzzy clustering algorithm is proposed by modifying the fuzzy membership function. The spatial relation matrix between pixel and region is constructed to constrain this function. The region which contains the entire target is segmented efficiently based on the improved fuzzy clustering algorithm. At last, infrared target extraction is achieved by the fusion of spatio and temporal results. Experimental results show that the proposed algorithm is simple and effective which can facilitate the target recognition and tracking in the next step.

关键词： Target tracking Data mining Clustering algorithms Gaussian distribution Infrared detectors Background noise change detection algorithms Image segmentation Infrared imaging Image sequences

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A two layered case based reasoning approach to text summarization, based on summarization pattern

A two layered case based reasoning approach to text summariz...

引用

IEEE Symposium on Systems and Information Engineering Design, SIEDS

作者： N. Reyhani K. Badie M. Kharrat Info Society Department Iran Telecom Research Center Iran

What actually is done in case of text summarization in case based reasoning terminology is that, the situation is defined as the ensemble of some consecutive sentences, and the solution is the set of the sentences selected as the outcome of the summarization process. In order to make a quality summary considering the context, a semantic understanding, seems to be important. In this respect we propose an approach to use a two layered CBR approach. Regarding this, we proposed an approach to text summarization based on two layered case based reasoning framework. Regarding this, the primary CBR cycle tries to make a summary of the source text, and the secondary CBR cycle tries to detect the context, and changes the bias values (fixed values) related to the primary CBR modules.

关键词： Computer aided software engineering Frequency Telecommunications Terminology change detection algorithms Silicon compounds Bayesian methods Neural networks Problem-solving

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PEAKSEEK: A Statistical Processing Algorithm for Radiation Spectrum Peak Identification

PEAKSEEK: A Statistical Processing Algorithm for Radiation S...

引用

International Conference on Tools for Artificial Intelligence (ICTAI)

作者： P. Forsberg V. Agarwal J. Perry R. Gao L.H. Tsoukalas T. Jevremovic School of Nuclear Engineering Purdue University West Lafayette IN USA Nuclear Engineering Program University of Utah Salt Lake UT USA

An accurate analysis of radiation data is essential in many nuclear related applications. In the intelligent model assisted sensing system (iMASS) development, nuclear resonance fluorescence (NRF) spectra of radioactive isotopes are used for detection of nuclear material in cargo containers at US ports. The NRF spectrum of a particular radioactive isotope has a unique signature at unique energy levels. This paper presents a statistical processing algorithm, Peakseek, developed to identify radiation peaks in NRF spectra with a certain degree of confidence. The algorithm tracks the changes in the count rate (theta) of the NRF spectrum and identifies the point of abrupt change in the count rate, i.e., energy level. Identification of abrupt changes in the count rate is performed on the basis of a generalized likelihood ratio statistical test.

关键词： Isotopes Energy states change detection algorithms Data analysis Resonance Fluorescence Radioactive materials Containers Performance evaluation Testing

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Combination of HOS based blind equalization algorithms for use in mobile communications

Combination of HOS based blind equalization algorithms for u...

引用

IEEE Signal Processing Workshop on Higher-Order Statistics

作者： A.K. Nandi C. Schmitdt Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK University of Strathclyde Glasgow Glasgow GB

Mobile communication links require adaptive equalization with a fast rate of convergence while keeping computational effort at reasonable levels. In this paper we propose to combine known algorithms for blind equalization in order to exploit their desirable properties to reach this goal. A switching criterion is proposed which is based on the change in the equalizer impulse response between iterations of the adaption algorithm and may be used to detect changes of the channel impulse response. algorithms under consideration include Godard's algorithm, stop-and-go algorithm, and tricepstrum equalization algorithm (TEA).

关键词： Blind equalizers Mobile communication Signal processing algorithms change detection algorithms Convergence Switches Adaptive equalizers Least squares approximation Intersymbol interference Inference algorithms

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Automatic through the wall detection of moving targets using low-frequency ultra-wideband radar

Automatic through the wall detection of moving targets using...

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IEEE National Conference on Radar

作者： Anthony Martone Kenneth Ranney Roberto Innocenti Army Research Laboratory Adelphi MD USA

ISBN: (纸本)9781424458110;9781424458127

This paper presents a time-domain, Moving Target Indication (MTI) processing formulation for detecting slow-moving personnel behind walls. The proposed time-domain MTI processing formulation consists of change detection and automatic target recognition algorithms. We demonstrate the effectiveness of the MTI processing formulation using data collected by an impulse-based, low-frequency, ultra-wideband radar. In this paper, we describe our radar system and algorithms used for the automatic detection of moving personnel. We also analyze the false alarm and detection rate of four operational scenarios of personnel walking inside wood and cinderblock buildings.

关键词： Radar detection Ultra wideband technology Personnel Radar imaging Radar antennas Time domain analysis change detection algorithms Signal processing algorithms Legged locomotion Ultra wideband radar

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Overhead analysis of location-aware two-phase coding multi-channel MAC protocol (LA-TPCMMP) for MANETs

Overhead analysis of location-aware two-phase coding multi-c...

引用

Conference on Local Computer Networks (LCN)

作者： Lili Zhang Boon-Hee Soong Wendong Xiao School of Electrical & Electronic Engineering Nanyang Technological University Singapore Institute for Infocomm Research The New Initiatives Singapore

ISBN: (纸本)0769522602

We present a novel location-aware multi-channel medium access control (MAC) protocol for large-scale dense mobile ad hoc networks (MANETs) based on a scalable two-phase coding scheme, where the first-phase code is used to differentiate adjacent cells and the second-phase code is employed to distinguish nodes in one specific cell. It eliminates the hidden terminal problem (HTP) during data transmission without requiring periodical exchange of neighborhood information. Furthermore, we introduce a collision resolution mechanism in the control channel. We analyze the performance of the proposed protocol in terms of control overhead. Its theoretical results are confirmed by simulations and it is demonstrated that the new protocol significantly outperforms the classical code division multiple access (CDMA) based multi-channel MAC protocols.

关键词： Media Access Protocol Mobile ad hoc networks Access protocols Scheduling algorithm Broadcasting Data communication Performance analysis Multiaccess communication change detection algorithms Drives

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Wideband interference cancellation using adaptive antenna arrays

Wideband interference cancellation using adaptive antenna ar...

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National Conference on Radio Science (NSRC)

作者： E.A. Soleit K.A. El-Barbary M.Z. Heneidi Egyptian Armed Forces Syrian Armed Forces

A wideband interference cancellation using adaptive antenna arrays is the objective of this paper. A comparison between the performance of the adaptive interference canceller with least mean square error (AIC-LMS) and the higher order statistics (AIC-HOS), fourth order cumulant based algorithm is presented. The performances of both algorithms are compared through computer simulations. The effects of the number of interference sources, and the change of the direction of arrival and the frequency band of the interference sources on the performance of the adaptive interference canceller are evaluated. It is found that the AIC-HOS algorithm exhibits a better adaptation speed and greater detection capability of the desired signal than that of the LMS one.

关键词： Broadband antennas Adaptive arrays Interference cancellation Antenna arrays Mean square error methods Higher order statistics Computer simulation Frequency change detection algorithms Adaptive signal detection

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Detecting changes in the Hurst parameter

Detecting changes in the Hurst parameter

引用

Conference on Local Computer Networks (LCN)

作者： S. Chatterjee M.H. MacGregor S. Bates Department of Electrical and Computer Engineering University of Alberta Canada Department of Computing Sciences University of Alberta Canada

The Hurst parameter characterizes the degree to which a time series is long range dependent (LRD). The value of this parameter can be used as an input to algorithms for bandwidth allocation, buffer sizing and congestion control. However, for these algorithms to be effective over the long run they must change their actions when the value of the Hurst parameter changes. We demonstrate a new technique which uses a wavelet decomposition to detect a change in the Hurst parameter. Our technique tests the variance structure of the wavelet coefficients at multiple scales and uses changes in variance to signal a change in the value of the Hurst parameter. The efficacy of the proposed technique is demonstrated by comparing its performance to that of another recently proposed method for change detection. The performance tests were conducted using artificially generated data sets which contain changes in the Hurst parameter of known position, magnitude and sign.

关键词： Time domain analysis Discrete wavelet transforms Wavelet transforms change detection algorithms Wavelet domain Real time systems Correlation

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