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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Jinwen Zan M. Omair Ahmad M.N.S. Swamy Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University West Montreal QUE Canada

In this paper, a non-causal median filtering method is proposed to predict the motion vectors across the wavelet subbands of a video frame for multiresolution motion estimation. This median filtering method effectively overcomes the problem of propagation of false motion vectors that exists in the conventional multiresolution motion estimation schemes. A significant feature of the proposed technique is that it imposes no demand for additional bandwidth. Simulation studies show that this median filtering-based multiresolution motion; estimation technique effectively improves the motion prediction performance. It is further shown that this performance improvement is achieved with little increase in the computational complexity.

关键词： Filtering Calendars Fires

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Clustering methods for accurate DNA base-calling

Clustering methods for accurate DNA base-calling

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Asilomar Conference on signals, Systems & computers

作者： E.S. Manolakos Communications and Digital Signal Processing (CDSP) Center Electrical and Computer Engineering Department Northeastern University Boston MA USA

Routinely extending the useful read-lengths of DNA chromatograms beyond 1 kps by employing intelligent base-calling algorithms will be extremely useful to genomics research because in many cases the entire coding region of a gene could fit into a single long read. By segmenting the chromatograms into base-call "events" to be labeled in terms of the number of bases they represent, base-calling as a pattern classification problem is formulated. An overview of two unsupervised clustering methods that could be used for its solution is presented.

关键词： Clustering methods DNA Data mining Digital signal processing Clustering algorithms signal processing algorithms Electrokinetics Detectors Sequences signal processing

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A 1.2 V rail-to-rail differential mode input linear CMOS transconductor

A 1.2 V rail-to-rail differential mode input linear CMOS tra...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Aimin Xu M.F. Li Signal Processing and VLSI Design Laboratory Department of Electrical and Computer Engineering National University of Singapore Singapore

Rail-to-rail differential mode input capability in low voltage CMOS transconductor design is implemented by a pull-down and a pull-up follower in an input buffer. By generating three intermediate voltages in the buffer stage, three voltages are converted to three currents and subsequently summed using MOSFETs operating in the triode region. The nonlinear current components can be cancelled completely. The lowest supply voltage V/sub dd/ is constrained by 2V/sub th/ of the MOS transistors. A single 1.2V operational transconductor amplifier (OTA) was designed using 0.35/spl mu/m CMOS technology and the simulated I-V linearity error is less than 1% within the rail-to-rail differential input range. The achieved THD is less than 0.6% for a 1 KHz, 1.2 V/sub pp/ input signal.

关键词： Rail to rail inputs Transconductors MOSFETs CMOS technology Low voltage Differential amplifiers Operational amplifiers Rail to rail amplifiers Linearity Rail to rail operation

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CHEAP CONTROL PERFORMANCE LIMITATIONS OF INPUT CONSTRAINED LINEAR SYSTEMS

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IFAC Proceedings Volumes 2002年第1期35卷 503-508页

作者： Tristan Pérez Graham C. Goodwin Maria M. Serón Department of Electrical and Computer Engineering The University of Newcastle Australia Laboratory for Dynamical Systems and Signal Processing (LSD) Universidad Nacional de Rosario Argentina

Limited authority of actuators implies that real control signals are always constrained, and in almost all cases, this produces a degradation in the performance of the system. It is thus of practical importance to understand the fundamental aspects of this performance degradation. In this paper, we take an initial step by proposing a way to characterize the performance limitations that arise in closed-loop stable linear systems due to the constraints on the magnitude of the control signal. Specifically, we evaluate the cost associated with the constraints via the L 2 norm of the tracking error of a constrained limiting optimal compensator.

关键词： Performance limitations cheap control constrained control systems

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Thresholding video images for text detection

Thresholding video images for text detection

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作者： Du, Eliza Yingzi Chang, Chein-I Thouin, Paul D. Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County 1000 Hilltop Circle Baltimore MD 21250 Department of Defense Fort Meade MD 20755

Thresholdging video images is very challenging due to the fact that image background generally has low resolution and is also more complicated and highly distorted than document images. As a result, thresholding methods that work well for document images may not work effectively for video images in some applications. This paper investigates the issue of thresholding video images for text detection and further develops a relative entropy-based thresholding approach that can effectively extract text from complicated video images. In order to demonstrate its performance a comparative study is conducted among the proposed thresholding method and several thresholding techniques which are widely used for document and gray scale images. The experimental results show that thresholdging video images is far more difficult than thresholding document images and simple histogram-based methods generally do not perform well. © 2002 IEEE.

关键词： Video signal processing

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Adaptive transmission for Infostations: a MC-CDMA implementation

Adaptive transmission for Infostations: a MC-CDMA implementa...

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Asilomar Conference on signals, Systems & computers

作者： C. Ibars Mizhou Tan Y. Bar-Ness Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

The Infostation concept is proposed for fourth generation cellular communications to provide very low cost data transfer. It provides non-ubiquitous coverage and very high data rates for users within small, isolated coverage areas by means of adaptive transmission. We propose a transmission scheme for infostations based on multi-carrier CDMA (MC-CDMA). The proposed system performs adaptive transmission by changing spreading code allocation and using adaptive modulation. In the receiver we propose to use successive interference cancellation (SIC), which decodes the most reliable symbols first. Approximate analytic and simulated results for bit error rate are given for a Rice Infostation channel. Transmission rates for the two user case under two proposed resource allocation policies are shown.

关键词： Multicarrier code division multiple access Costs Multiaccess communication Adaptive systems Modulation coding Interference cancellation Silicon carbide Decoding Analytical models Bit error rate

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A new space-time differentially coded DS-CDMA transceiver system for reliable communications

A new space-time differentially coded DS-CDMA transceiver sy...

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International Conference on Acoustics, Speech, and signal processing (ICASSP)

作者： Kun Wang Hongya Ge Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

ISBN: (纸本)0780374029

In this work, we present a new space-time differentially coded transceiver system for DS-CDMA applications. The proposed solution allows us to embed transmit diversity into the space-time-frequency (STF) domain in a simple yet effective way. It also enables a simple scheme for differential detection and data separation at the receiver without channel state information (CSI). Simulation results in comparison with other existing approaches demonstrate significant bit-error-rate (BER) performance improvement over a wide range of system parameters, such as signal-to-noise ratio (SNR) and near-far ratio (NFR).

关键词： Argon Transmitters Tin Decoding Antennas

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Multi-aspect pattern classification using predictive networks and error mapping

Multi-aspect pattern classification using predictive network...

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International Joint Conference on Neural Networks (IJCNN)

作者： J. Salazar M. Robinson M.R. Azimi-Sadjadi Signal/Image Processing Laboratory Department of Electrical and Computer Engineering Colorado State University Fort Collins CO USA

A classification scheme is developed for classifying underwater mine-like and non-mine-like objects from acoustic backscattered signals. This scheme uses a predictive network along with a neural network classifier. Th... 详细信息

关键词： Pattern classification Underwater acoustics Fusion power generation signal processing Neural networks Acoustic signal detection Probability computer errors Laboratories Acoustical engineering

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Accurate estimation of the signal baseline in DNA chromatograms

Accurate estimation of the signal baseline in DNA chromatogr...

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IEEE Workshop on Neural Networks for signal processing

作者： L. Andrade E.S. Manolakos Communications and Digital Signal Processing (CDSP) Center for Research and Graduate Studies Electrical and Computer Engineering Department Northeastern University Boston MA USA

Estimating accurately the varying baseline level in different parts of a DNA chromatogram is a challenging and important problem for accurate base-calling. We are formulating the problem in a statistical learning framework and propose an Expectation-Maximization algorithm for its solution. In addition we also present a faster, iterative histogram based method for estimating the background of the signal in small size windows. The two methods can be combined with regression techniques to correct the baseline in all regions of the chromatogram and are shown to work well even in areas of low SNR. By improving the separation of clusters, baseline correction actions reduce the classification errors when using the BEM base-caller developed in our group.

关键词： Statistical learning Bayesian methods signal resolution signal to noise ratio Data mining Digital signal processing DNA computing Expectation-maximization algorithms Iterative methods Histograms

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Thresholding video images for text detection

Thresholding video images for text detection

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16th International Conference on Pattern Recognition, ICPR 2002

作者： Du, Eliza Yingzi Chang, Chein-I Thouin, Paul D. 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 Department of Defense Fort MeadeMD20755 United States

ISBN: (纸本)0769516963

Thresholdging video images is very challenging due to the fact that image background generally has low resolution and is also more complicated and highly distorted than document images. As a result, thresholding methods that work well for document images may not work effectively for video images in some applications. This paper investigates the issue of thresholding video images for text detection and further develops a relative entropy-based thresholding approach that can effectively extract text from complicated video images. In order to demonstrate its performance a comparative study is conducted among the proposed thresholding method and several thresholding techniques which are widely used for document and gray scale images. The experimental results show that thresholdging video images is far more difficult than thresholding document images and simple histogrambased methods generally do not perform well. © 2002 IEEE.

关键词： Pattern recognition

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