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International Conference on Information Visualisation (IV)

作者： V. Mezaris H. Doulaverakis R.M.B. de Otalora S. Herrmann I. Kompatsiaris M.G. Strintzis Informatics and Telematics Institute (ITI) Centre for Research and Technology Hellas Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Institute for Integrated Systems Munich University of Technology Munich Germany

The SCHEMA Network of Excellence aims to bring together a critical mass of universities, research centers, industrial partners and end users, in order to design a reference system for content-based semantic scene analysis, interpretation and understanding. In this paper, advances in the development of the SCHEMA reference system are reported, focusing on the application of region-based image retrieval using automatic segmentation. More specifically, the integration of four segmentation algorithms and the MPEG-7 eXperimentation Model with the reference system are discussed, along with the motivation behind these and various other choices that were made during the development of the reference system. Experimental results for this system, as well as results for an earlier version of it employing proprietary descriptors, are shown using a common collection of images. Comparative evaluation of these versions, both in terms of retrieval accuracy and in terms of time-efficiency, allows the evaluation of the reference system as a whole as well as the evaluation of the usability of different components integrated with it, such as the MPEG-7 eXperimentation Model. These results illustrate the efficiency of the proposed system, as well as its suitability in serving as a test-bed for evaluating and comparing different algorithms and approaches pertaining to the content-based and semantic manipulation of visual information.

关键词： MPEG 7 Standard Image retrieval Image segmentation Content based retrieval Information retrieval Image analysis Information processing Laboratories computer networks Design engineering

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Heart rate variability analysis of effect of nicotine using periodograms

Heart rate variability analysis of effect of nicotine using ...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： T. Thong I.O. Yung D.P. Zajdel R.M. Ellingson J. McNames M. Aboy B.S. Oken Department of Biomedical Engineering Oregon Health and Sciences University Beaverton OR USA School of Medicine Oregon Health and Sciences University Portland OR USA Department of Neurology Oregon Health and Sciences University Portland OR USA Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland OR USA

Heart rate variability (HRV) is frequently used to measure autonomic nervous system (ANS) activity. However, little is known about the mechanism underlying pharmacologically induced changes in HRV. Previous research has shown that nicotine exposure stimulates the ANS, mediating a wide spectrum of physiological and behavioral effects, including altered respiratory sinus arrhythmia and enhanced arousal and attention. Using Lomb-Welch periodograms, the effect of nicotine on the ANS in 14 nicotine-naive human subjects are studied. Results showed an increase in the low frequency (LF) to high frequency (HF) ratio with little change in mean heart rate. Results suggest that nicotine affects both sympathetic and parasympathetic reactivities and that the LF/HF best characterizes early ANS activated nicotine changes in HRV. The Lomb-Welch periodogram of the HRV is also compared to the conventional interpolated Welch periodogram. The attenuation of the high frequency components due to interpolation of the non-uniform R-R intervals is found to be a function of the power of the high frequency components, increasing with increasing power. Thus analyses using Welch periodograms that make use of the high frequency components may yield erroneous results.

关键词： Heart rate Heart rate variability Sampling methods Interpolation Biomedical engineering Autonomic nervous system Neurotransmitters Spectral analysis Mesh generation Fourier transforms

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A novel statistical model for simulation of arterial and intracranial pressure

A novel statistical model for simulation of arterial and int...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M. Aboy J. McNames R. Hornero T. Thong D. Cuesta D. Novak B. Goldstein Signal Theory and Communicatións Department ETSI-Telecomunicacion University of Vigo Spain Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland USA Biomedical Engineering Department/Pediatrics Department Oregon Health and Sciences University Portland USA ETS-Alcoi Polytechnic University of Valencia Spain Department of Cybernetics Czech Technical University Czech Republic

We describe a novel statistical model of pressure signals that incorporates the effects of respiration on arterial (ABP) and intracranial pressure (ICP). This model can be used to synthesize pulsatile ABP and ICP signals with similar time, frequency, and variability characteristics of real pressure signals. These synthetic signals can be used during the development, simulation, or quantitative assessment of biomedical algorithms in a variety of applications.

关键词： Cranial pressure Signal processing algorithms Signal processing Pulse modulation Amplitude modulation Biomedical engineering Testing Availability Detection algorithms Parameter estimation

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Using handheld devices for real-time wireless teleconsultation

Using handheld devices for real-time wireless teleconsultati...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： K.A. Banitsas P. Georgiadis S. Tachakra D. Cavouras Department of Electrical and Computer Engineering Brunei University West London UK Medical Image and Signal Processing Laboratory Technological Educational Institute of Athens Athens Greece A&E Department North West London Hospitals NHS Trust Central Middlesex Hospital Central Middlesex Hospital London UK London UK

Recent advances in the hardware of handheld devices, opened up the way for newer applications in the healthcare sector, and more specifically, in the teleconsultation field. Out of these devices, this paper focuses on the services that personal digital assistants and smartphones can provide to improve the speed, quality and ease of delivering a medical opinion from a distance and laying the ground for an all-wireless hospital. In that manner, PDAs were used to wirelessly support the viewing of digital imaging and communication in medicine (DICOM) images and to allow for mobile videoconferencing while within the hospital. Smartphones were also used to carry still images, multiframes and live video outside the hospital. Both of these applications aimed at increasing the mobility of the consultant while improving the healthcare service.

关键词： Handheld computers Hospitals Personal digital assistants Medical services Wireless LAN Biomedical imaging Personnel Mobile handsets Smart phones Application software

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Power spectral density estimation and tracking nonstationary pressure signals based on Kalman filtering

Power spectral density estimation and tracking nonstationary...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M. Aboy J. McNames O.W. Marquez R. Hornero T. Thong B. Goldstein Signal Theory and Communications Dept ETSI-Telecomunicacion University of Vigo Spain Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland USA Signal Theory and Communications Department ETSI-Telecomunicación University of Valladolid Spain Biomedical Engineering Department Oregon Health and Sciences University Portland USA Pediatrics Department Oregon Health and Sciences University Portland USA

We describe an algorithm to estimate and track slow changes in power spectral density (PSD) of nonstationary pressure signals. The algorithm is based on a Kalman filter that adaptively generates an estimate of the autoregressive model parameters at each time instant. The algorithm exhibits superior PSD tracking performance in nonstationary pressure signals than classical nonparametric methodologies, and does not assume a piecewise stationary model of the data. Furthermore, it provides better time-frequency resolution, and is robust to model mismatches. We demonstrate its usefulness by a sample application involving PSD estimation and tracking of short records of simulated pressure waveforms. This algorithm is intended for applications were the PSD must be estimated and tracked during short transient periods, possibly after clinical interventions.

关键词： Kalman filters Signal resolution Signal processing Frequency estimation Signal processing algorithms Signal analysis Filtering Biomedical engineering Autocorrelation Transient analysis

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Corrections to “Design of Two-Dimensional Recursive Filters Using Genetic Algorithms”

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IEEE Transactions on Circuits and Systems I: Regular Papers 2004年第12期51卷 2516-2516页

作者： N.E. Mastorakis I.F. Gonos M.N.S. Swamy Department of Computer Science Hellenic Naval Academy Military Institutions of University Education Piraeus Greece High Voltage Laboratory of Athens National and Technical University of Athens Athens Greece Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

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Some imaging properties of an optical heterodyne scanning image processor

Some imaging properties of an optical heterodyne scanning im...

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Frontiers in Optics, FiO 2003

作者： Poon, Ting-Chung Optical Image Processing Laboratory Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA24061 United States

ISBN: (纸本)1557527598

We present some of the imaging properties of an optical heterodyne scanning image processor. The image processor is a two-pupil optical system capably of three-dimensional (3-D) imaging coherently or incoherently, depending on the detection scheme used. We will then discuss optical scanning holography (OSH) through the development of the two-pupil optical heterodyne scanning image processor. Last, we illustrate some important 3-D example in OSH and show that two reconstructions can be obtained corresponding to the real and pseudoscopic reconstructions of a conventional hologram. © 2003 Optical Society of America

关键词： Scanning

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Improved speaker verification through probabilistic subspace adaptation 8

Improved speaker verification through probabilistic subspace...

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8th European Conference on Speech Communication and Technology, EUROSPEECH 2003

作者： Lucey, Simon Chen, Tsuhan Advanced Multimedia Processing Laboratory Department of Electrical and Computer Engineering Carnegie Mellon University PittsburghPA15213 United States

In this paper we propose a new adaptation technique for improved text-independent speaker verification with limited amounts of training data using Gaussian mixture models (GMMs). The technique, referred to as probabilistic subspace adaptation (PSA), employs a probabilistic subspace description of how a client?s parametric representation (i.e. GMM) is allowed to vary. Our technique is compared to traditional maximum a posteriori (MAP) adaptation, or relevance adaptation (RA), and maximum likelihood eigen-decomposition (MLED), or subspace adaptation (SA) techniques. Results are given on a subset of the XM2VTS databases for the task of textindependent speaker verification.

关键词： Maximum likelihood

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On the performance of the ant colony system for solving the multidimensional knapsack problem

On the performance of the ant colony system for solving the ...

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IEEE Pacific Rim Conference on Communications, computers and Signal processing

作者： R. Parra-Hernandez N. Dimopoulos Department of Electrical and Computer Engineering Laboratory for Parallel and Intelligent Systems - LAPIS Laboratory for Parallel and Intelligent Systems-LAPIS Department of Electrical and Computer Engineering University of Victoria Canada

The purpose of this paper is to present a modified version of the ant colony system (ACS) algorithm. The modified ACS algorithm is faster and it has a better performance than the standard ACS algorithm. We have established a set of local rules/modifications, that do improve the performance of the standard ACS and these are reported here.

关键词： Multidimensional systems Laboratories Intelligent systems Legged locomotion Constraint optimization Linear programming Lagrangian functions Resource management

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Novel registration technique for InISAR & InSAR

Novel registration technique for InISAR & InSAR

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2003 IEEE IGARSS: Learning From Earth's Shapes and Colours

作者： Zhang, Q. Yeo, T.S. Radar and Signal Processing Laboratory Department of Electrical and Computer Engineering National University of Singapore 10 Kent Ridge Crescent 119260 Singapore

In InISAR system, the pixels between two ISAR images derived from corresponding antennas usually do not register properly without prior compensation. A three-dimension motion compensation method, or 3D focusing, is put forward in this paper. With the multi-Antenna-pair configuration in radar system, the angular motion p arameters b oth in the a zimuth and p itching a re estimated accurately and the phase unwrapping processing can be avoided in the procedure of obtaining phase unambiguous. Simulation data is used to illustrate the accuracy of the proposed method. The method has also been extended to stripmap SAR for the interferometric 3D imaging of moving and/or man-made objects. © 2003 IEEE.

关键词： Motion compensation

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