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检索条件"任意字段=Conference on Signal and Data Processing of Small Targets 2010"

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Face recognition using AdaBoost modular locality preserving projections

Face recognition using AdaBoost modular locality preserving ...

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作者： Liu, Pengzhang Lam, Kin-Man Shen, Tingzhi Department of Electronic Engineering Beijing Institute of Technology School of Information Science and Technology Beijing 100081 China Department of Electronic and Information Engineering Centre for Signal Processing Hong Kong Polytechnic University Hong Kong Hong Kong

Locality Preserving Projections (LPP) is a linear manifold learning method proposed for feature extraction which can optimally preserve the neighborhood structure of a data set. Although LPP has been widely applied in image recognition, working as a holistic approach, it is sensitive to variations caused by illumination and expression, and to inaccuracy in face localization. To alleviate these problems, in this paper, we propose to combine the block-based LPP with the AdaBoost algorithm to select the features to improve the accuracy of face recognition. This algorithm, namely AdaBoost Modular LPP (AMLPP), divides a facial image into many overlapping small blocks, and applies LPP to these blocks to form block features. By using'pseudo-loss' and by updating the distribution of mislabelled samples in the AdaBoost algorithm, AMLPP selects adaptively those optimal block features from a huge set of potential block features to form a number of weak classifiers, which are then combined for the construction of a strong classifier for accurate and efficient face recognition. In each feature-selection process, optimal features are selected to generate weak classifiers, which emphasizes those hard-to-classify samples. Our AMLPP algorithm is compared with the LPP algorithm, the neighborhood preserving embedding (NPE), the discriminant locality preserving projections (DLPP), and the orthogonal locality preserving projections (OLPP), based on the Yale and YaleB face databases. Experimental results show a significant improvement when using our proposed algorithm.

关键词： Adaptive boosting

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Measurement-based delay-and-sum signal processing for linear antenna arrays

Measurement-based delay-and-sum signal processing for linear...

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IEEE International conference on Wireless Information Technology and Systems (ICWITS)

作者： Christian M. Schmid Reinhard Feger Stefan Scheiblhofer Andreas Stelzer Institute for Communications Engineering and RF Systems Christian Doppler Laboratory for Integrated Radar Sensors Johannes Kepler University Linz Linz Austria

The design of a delay-and-sum beamformer based on measured data is presented in this paper. Traditionally the weighting of a delay-and-sum beamformer is designed based on an idealized signal model, with specifications on the beam pattern in terms of the beam width and the sidelobe level (SLL). The goal is a trade-off between resolution and the ability to detect targets with a certain dynamic range. In this work we propose an approach to the optimization of a delay-and-sum beamformer with the same goal in mind however not based on the ideal signal model, but based on measured data. Being a measurement-based method even effects of non-idealities that are not part of the ideal signal model such as mutual coupling can be suppressed. The proposed approach is validated in simulations for a 77-GHz 36-elements non-uniform frequency-modulated continuous-wave radar array.

关键词： Radar antennas Array signal processing Radar Mutual coupling Arrays Antenna arrays Receiving antennas

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FCM-based radar target detection in medium frequency signal of radar

FCM-based radar target detection in medium frequency signal ...

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International conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Xiaohong Su Jidong Suo Xiaoming Liu Yingchun Wang Information Science and Technology College Dalian Maritime University Dalian China

In radar target detection application fields, rich of information of targets may be included in medium frequency. Doppler shift caused by moving target is one of them. In this paper, Doppler shift and its Short Time Fourier Transform-STFT is analyzed and discussed. Since it is difficult to distinguish the Doppler shift of moving target even in frequency domain with STFF method, fuzzy C means clustering method is introduced to seek the two centers of the mixed signals in a radar scanning period. Using multiple radar scanning period, several centers can be determined by a center function using arithmetic mean filter. Finally the targets can be detected by threshold decision and calculated the detection probability. This algorithm is simple, easily to realize, with small computation burden and good target detection probability.

关键词： Doppler radar signal processing algorithms Doppler effect Radar detection Object detection Clustering algorithms

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MULTIPLE ACOUSTIC SOURCE LOCALIZATION BASED ON MULTIPLE HYPOTHESES TESTING USING PARTICLE APPROACH

MULTIPLE ACOUSTIC SOURCE LOCALIZATION BASED ON MULTIPLE HYPO...

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IEEE International conference on Acoustics, Speech, and signal processing

作者： Yeongseon Lee Ted S. Wada Biing-Hwang (Fred) Juang Center for Signal and Image Processing Georgia Institute of Technology Atlanta GA 30332

ISBN: (纸本)9781424442959

Localization of multiple acoustic sources in a non-ideal environment has a number of difficulties, among which are accurate acoustic feature estimation for multiple sources and association uncertainty between measurements and their corresponding sources. This paper focuses more on the latter and proposes an algorithm based on a multiple-hypothesis framework for both a measurement model and a measurement association model to localize multiple sources. A conditional data likelihood model based on a measurement hypothesis is proposed and implemented using particles. Simulation results demonstrate that the proposed algorithm is capable of localizing the positions of multiple sources with a small number of microphones without any prior knowledge when the amount of reverberation is moderate.

关键词： time difference of arrival estimation multiple acoustic source localization data association multiple hypotheses data likelihood data association Position measurement acoustic radiators Microphone Device Component Reverberation Prior Learning

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Software solutions for implementation of biotelemetric system

Software solutions for implementation of biotelemetric syste...

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International conference on Applied Electronics, AE

作者： Dalibor Janckulik Leona Motalova Ondrej Krejcar Faculty of Electrical Engineering and Computer Science Department of Measurement and Control Technical University of Ostrava Ostrava Czech Republic Faculty of Electrical Engineering and Computer Science Centre of Applied Cybernetics Technical University of Ostrava Ostrava Czech Republic

This paper describes development of a biotelemetric system and problem of real time processing of ECG signal. In this case of signal processing ECG CorBelt primarily on mobile embedded monitoring stations. The Whole system is based on Microsoft product as Windows Mobile, Microsoft SQL Server, .NET Micro Framework, .NET Compact Framework and .NET Framework. On paper is deal with ECG measurement devices and there are evaluated pasted real tests. Problem in processing of ECG signal is quantity of transfered data. Commercial mobile devices can't processing this data on Real Time. Our paper are described possibilities of parsing of this ECG signal. Visualization of data is solved by small userfriendly application created in WPF (Windows Presentation Foundation) and Silverlight application. This application was created in development environment Microsoft Expression Blend and was subjected to stress tests. This application and tests results are presented too.

关键词： Electrocardiography data visualization Servers Mobile communication Real time systems databases Wireless communication

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ON PROLONGING LIFE-TIME IN WIRELESS SENSOR NETWORKS WITH APPLICATION IN LOCALIZATION: A COALITIONAL GAME-THEORETIC APPROACH

ON PROLONGING LIFE-TIME IN WIRELESS SENSOR NETWORKS WITH APP...

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IEEE International conference on Acoustics, Speech, and signal processing

作者： Omid Namvar Gharehshiran Vikram Krishnamurthy University of British Columbia Department of Electrical and Computer Engineering

ISBN: (纸本)9781424442959

Lifetime maximization is a key challenge in the design of sensor-network-based tracking applications. In this paper, formation of optimal coalitions of nodes is investigated for data acquisition in bearings-only target localization such that the average sleep times allocated to the nodes are maximized. Cooperative game theory is utilized as a tool to devise a distributed dynamic coalition formation algorithm in which nodes autonomously decide which coalition to join, while maximizing their feasible sleep times. If each node follows the proposed algorithm, the average sleep time for the entire network eventually converges to its maximum feasible value conditional on the pre-defined localization accuracy. This algorithm can also be employed in tracking slow moving targets.

关键词： Dynamic coalition formation non-superadditive cooperative games localization and tracking wireless sensor networks (WSN) Wireless sensor networks sleep time paper evenness Ganglia Radio indium Game theory Sensors Interest groups data Collection Methods Network

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Vital signs monitoring with a UWB radar based on a correlation receiver

Vital signs monitoring with a UWB radar based on a correlati...

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European conference on Antennas and Propagation, EuCAP

作者： Mario Leib Wolfgang Menzel Bernd Schleicher Hermann Schumacher Microwave Techniques Ulm University Ulm Germany Electron Devices and Circuits Ulm University Ulm Germany

In the first part of this publication, vital signs detection observing small amplitude changes due to the movement of a target in front of the radar is shown. In the context of vital signs monitoring the target is the chest of human beings. This basic principle is also used in continuous wave (CW) radars, but the presented impulse-based UWB radar has moreover a range gating capability. Consequently, the target distance can be obtained and different targets (persons) can be monitored. Several measurement results using this measurement principle for respiration and in particular for heart beat monitoring are presented and discussed. Furthermore, the shortcomings of this method are depicted. In the second part, advanced signal post-processing by deconvolution with a Wiener filter is presented, leading to an improved resolution performance for the realized UWB radar system. Promising results of this method show that small targets can be identified in a multi-target scenario. Therefore, the movement of small targets, e. g. the heart muscle within the human body, could be tracked directly.

关键词： Monitoring Ultra wideband radar Humans Particle measurements Radar detection Heart beat Wiener filter signal resolution Muscles Radar tracking

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Detecting and Identifying Two Stationary-Human-targets: A Technique Based on Bioradar

Detecting and Identifying Two Stationary-Human-Targets: A Te...

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International conference on Pervasive Computing signal processing and Applications (PCSPA)

作者： Zhang Yang Jing Xijing Jiao Teng Zhang Zhu Lv Hao Wang Jianqi Faculty of Biomedical Engineering Fourth Military Medical University Xi'an China

Bioradar is a novel kind of radar combining the technology of radar and biomedical engineering. It can detect vital signals (such as breath, heartbeat, movement, etc.) in a certain distance through the nonmetal substances (such as brick walls, rubble, etc.) without using electrodes or sensors. However, multi-stationary-human-target identifying and locating has not been resolved yet. Based on the Ultra Wide-band (UWB) bioradar, we developed a method combining biomedical signal processing and space-frequency analysis to distinguish two stationary human subjects in different distances and to identify the location of each human subject. Experiments were done to evaluate the effectiveness of the proposed method. In 86 data sets the accuracy of distinguishing two stationary subjects reached 73%. This method may serve as a basis for further studies in developing appropriate 2-Dimension locating image reconstruction models via multi-antenna (static) UWB radar.

关键词： Humans Radar antennas Spectrogram Ultra wideband radar Radar imaging Radar detection

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Design and Implementation of a Dual-Interface Radar data Recorder

Design and Implementation of a Dual-Interface Radar Data Rec...

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2010 2nd International conference on signal processing System(2010年信号处理系统国际会议 ICSPS 2010)

作者： Zhang Yuxi Yao Wang Jiang Hai Wang Jun Zhang Yuxian Group 203 Beihang University (BUAA) Beijing 100191 P.R.China Automatic Control and Computer Simulation Liaoning 125001 P.R.China

This paper analyses the design and implementation of a small-scale dual-interface radar data recorder based on DSP+FPGA. It has two types of interfaces: solid-state IDE hard disk and RJ45. The recorder can save sampling data of original radar waveforms in real time for further analysis and validation. It adapts to a variety of application environments and has a high storage speed and reliable operation performance. It can be widely used in radar testing and flight experiments.

关键词： solid-state IDE hard disk network interface PD radar data record

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The FUTON Prototype: Proof of Concept for Coordinated Multi-Point in Conjunction with a Novel Integrated Wireless/Optical Architecture

The FUTON Prototype: Proof of Concept for Coordinated Multi-...

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IEEE Wireless Communications and Networking conference Workshops (WCNCW)

作者： Fabian Diehm Patrick Marsch Gerhard Fettweis Vodafone Chair Mobile Communications Systems Technische Universität Dresden Germany

ISBN: (纸本)9781424464050;9781424464067

The growing relevance of wireless communications has been driving the research and development to enable cost-efficient support of very high data rates to be delivered to a large number of users. The high bandwidth targets for future networks are reflected in the ITU's call for IMT-Advanced. As interference poses the main limitation in today's networks, cooperative signal processing (often referred to as coordinated multi-point, CoMP) is seen as a key enabler to achieve these targets. However, cooperation among base stations in traditional cellular infrastructures is problematic because interconnections (referred to as backhaul) are often very limited in capacity and investigations on more flexible and cost-efficient future architectures are being undertaken. A promising concept was proposed in the European research project FUTON. It is based on the use of radio-over-fiber (RoF) technology to create a distributed antenna system (DAS) that is capable of supporting the high requirements of future wireless networks. Currently, a prototype FUTON system is being built as a proof of concept. In this contribution, we describe the FUTON architecture and give insights into the demonstration that is being prepared. Results from trials with the planned setup will follow.

关键词： Prototypes Integrated optics Optical signal processing Wireless communication Research and development Bandwidth Interference signal processing Base stations Wireless networks

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