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Landmark-based shape recognition by a modified Hopfield neural network

Landmark-based shape recognition by a modified Hopfield neur...

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IEEE International Conference on Systems, Man and Cybernetics

作者： N. Ansari K. Li Center of Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

A new method is introduced to achieve partial shape recognition by means of a modified Hopfield neural network. Given a scene consisting of partially occluded objects, a model object in the scene is hypothesized by matching the landmarks of the model with those in the scene. A local shape measure, known as the sphericity of a triangular transformation, is used as a measure of similarity between two landmarks. The hypothesis of a model object in a scene is completed by matching the model landmarks with the scene landmarks. The landmark matching task is performed by a modified Hopfield neural network. The location of the model in the scene is estimated with a least squares fit among the matched landmarks. A heuristic measure is then computed to decide if the model is in the scene.< >

关键词： Hopfield neural networks Layout Shape measurement Service robots Humans Libraries Wire signal processing Least squares approximation Application software

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The performance evaluation of a new neural network based traffic management scheme for a satellite communication network

The performance evaluation of a new neural network based tra...

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IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record

作者： N. Ansari D. Liu Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

The scheme consists of two levels of management. The front end of the scheme is a derivation of Kohonen's self-organization model to configure maps for the satellite communication network dynamically. The model consists of three stages. The first stage is the pattern recognition task, in which an exemplar map that best meets the current network requirements is selected. The second stage is the analysis of the discrepancy between the chosen exemplar map and the state of the network, and the adaptive modification of the chosen exemplar map to conform closely to the network requirement (input data pattern) by means of Kohonen's self-organization. On the basis of certain performance criteria, whether a new map is generated to replace the original chosen map is decided in the third stage. A state-dependent routing algorithm, which arranges the incoming call to some proper path, is used to make the network more efficient and to lower the call block rate.< >

关键词： Neural networks Telecommunication traffic Routing Satellite communication computer network management Technology management engineering management Traffic control Artificial satellites Communication networks

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A VLSI DSP chip for real time iterative deconvolution

A VLSI DSP chip for real time iterative deconvolution

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IEEE Southeastcon

作者： R.B. Whitted P.B. Crilly Department of Electrical and Computer Engineering Communications Information and Signal Processing Group Knoxville TN USA

The design of a CMOS VLSI chip to perform real-time iterative deconvolution is presented. A bit-level systolic array architecture for convolution, multiplication, and addition is used to implement the circuit. A brief introduction to the iterative deconvolution problem is also given. Simulations done to data have shown that the systolic array portions of the chip will yield satisfactory throughput for millions of iterations per second.< >

关键词： Very large scale integration Digital signal processing chips Deconvolution Systolic arrays Convolution Spectroscopy Fourier transforms Circuits Semiconductor device measurement Iterative methods

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Priority-based dynamic access policies to WAN from LAN/MAN

Priority-based dynamic access policies to WAN from LAN/MAN

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Conference on Local computer Networks (LCN)

作者： Yong-Hee Jeon I. Viniotis Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

The authors consider the integration problem of LAN/MAN traffic to WAN by ATM/SONET multiplexing. They propose separate buffers for voice and data to efficiently control the throughput of each traffic type. Transmission bandwidth is dynamically and adaptively shared between voice and data to guarantee grade of service (GOS) requirements for each traffic type. The authors propose two algorithms for access policies; the (N/sub 1/,N/sub 2/) scheme and its adaptive variation. Their algorithms do not require the knowledge of arrival statistics. In the fact scheme, they can play with the tradeoff between delay and cell loss probability of each traffic type. In the second scheme, for most of the time and under normal network conditions, voice traffic has higher priority. Data traffic has higher priority when the number of data cells queued reaches a certain threshold. They show how the network performance is affected by several system parameters.< >

关键词： Wide area networks Local area networks Traffic control Telecommunication traffic Asynchronous transfer mode SONET Throughput Bandwidth Statistics Delay

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Estimating 3-D motion and structure parameters of a rigid planar object by establishing landmark correspondence

Estimating 3-D motion and structure parameters of a rigid pl...

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IEEE International Conference on Systems, Man and Cybernetics

作者： N. Ansari H. Agustiawan Center of Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

Results of combining the shape recognition method of N. Ansari and E.J. Delp (1989) and two motion estimation algorithms presented by R.Y. Tsai and T.S. Huary (1981, 1982) to perform motion and structure estimation of a rigid planar object from landmark matching are presented. From all numerical experiments that have been tried, the recognition algorithm can handle the landmark matching tasks well if the object follows a relatively small rigid motion such that the normal of the object surface is not almost perpendicular to the optical axis. Due to the nonlinearity of the computation procedure of the combined algorithm and roundoff error generated by the computer, the estimated parameters deviate up to 10% from the predefined parameters. The combined algorithm is, however, convenient, inexpensive and not shaken by missing or extraneous landmarks in the second view as long as there are more than three landmark corresponding pairs.< >

关键词： Motion estimation signal processing algorithms Probes Equations Shape measurement Optical signal processing Roundoff errors Parameter estimation Layout Matrices

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Bispectrum estimation via autoregressive modeling: a group delay approach

Bispectrum estimation via autoregressive modeling: a group d...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： S.V. Narasimhan G.R. Reddy E.I. Plotkin M.N.S. Swamy Centre of Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal Canada

A new method of bispectrum estimation by an AR (autoregressive) model has been proposed for a signal which is the output of a mixed-phase system driven by a non-Gaussian noise. This is achieved by relating the bispectrum phase and magnitude to the system group delay functions. The maximum and minimum phase property of the group delay functions makes AR bispectrum estimation possible, since there exists a direct relation between the cepstral and AR coefficients. The proposed method uses only the bispectrum information and is applicable for moving average (MA) or AR or ARMA system with either mixed-phase poles or mixed-phase zeros or both. Unlike some of the existing methods, it uses all the bispectral information and does not involve any solution of a system of equations. The method has been illustrated for MA and ARMA systems using sample root mean square error as the performance index.< >

关键词： Delay estimation Brain modeling Cepstral analysis Poles and zeros Root mean square Performance analysis Noise measurement Gaussian noise Spectral analysis Speech

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Performance Evaluation of a Buffer less NxN Synchronous Clos ATM Switch with Priorities and Space Preemption

Performance Evaluation of a Buffer less NxN Synchronous Clos...

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1991 IEEE International Conference on communications - communications: Rising to the Heights, ICC 1991

作者： Nilsson, Arne A. Lai, Fuyung Perros, Harry G. Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695-7914 United States Center for Communications and Signal Processing North Carolina State University RaleighNC27695-7914 United States Department of Computer Science North Carolina State University RaleighNC27695-7914 United States

ISBN: (纸本)0780300068

We consider a synchronized bufferless Clos ATM switch with input cell processor queues. The arrival process to each input port of the switch is assumed to be bursty and it is modeled by an Interrupted Bernoulli Process. Two classes of cells are considered. Service in an input cell processor queue is head-of-line without preemption. In addition, space preemption is used. That is, a high priority cell arriving to a full queue takes the space occupied by the low priority cell with the least waiting time in the queue but not the one in service. Each cell processor queue is modeled as a pri-ority IBP/Geo/l/K+1 queue with space preemption. We present an exact analysis of the priority queue. The results obtained are then used in an approximation algorithm for the analysis of the ATM switch. © 1991 IEEE.

关键词： Cells

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A NOVEL NONLINEAR FILTER FOR IMAGE-ENHANCEMENT 2

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CONF ON IMAGE processing ALGORITHMS AND TECHNIQUES

作者： YU, TH MITRA, SK KAISER, JF Signal and Image Processing Laboratory Department of Electrical and Computer Engineering University of California Santa Barbara 93106 CA United States Bell Communications Research Inc. Room 2A-281 445 South Street Morristown 07962-1910 NJ United States

ISBN: (纸本)0819405515

Recently, a very simple nonlinear algorithm, the so-called Teager's algorithm, has been introduced to calculate the energy of a one-dimensional sequence [1]. In this paper, this algorithm is extended to two-dimensional signals and applied to the contrast enhancement of images. Initial simulation results indicate that the proposed approach yields a superior and visually pleasing enhancement of natural images. The new algorithm is very simple and permits fast implementation. © 1991 SPIE. All rights reserved.

关键词： Image enhancement

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Configuring stack filters by the LMS algorithm

Configuring stack filters by the LMS algorithm

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IEEE Workshop on Neural Networks for signal processing

作者： N. Ansari Y. Huang J.-H. Lin Center of Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA Department of Electrical Engineering University of Delaware Newark DE USA

Stack filters are a class of sliding-window nonlinear digital filters that possess the weak superposition property (threshold decomposition) and the ordering property known as the stacking property. They have been demonstrated to be robust in suppressing noise. A new method based on the least means squares (LMS) algorithm is developed to adaptively configure a stack filter. Experimental results are presented to demonstrate the effectiveness of the proposed method to noise suppression.< >

关键词： Least squares approximation signal processing algorithms Stacking Adaptive filters Adaptive signal processing Filtering Digital signal processing Noise robustness Working environment noise signal processing

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Performance analysis of complementary coded radar signals in an AWGN environment

Performance analysis of complementary coded radar signals in...

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IEEE Southeastcon

作者： A.K. Ojha D.B. Koch Communications Information and Signal Processing (CISP) Group Department of Electrical and Computer Engineering University of Tennessee Knoxville TN USA

The authors investigate the performance of PN (pseudonoise) codes and complementary codes in an additive white Gaussian noise (AWGN) environment from a detection standpoint, and they provide a comparison of the performance of these two coding methods in a pulsed radar context. A general method of choosing a cost function is proposed to compare the two coding schemes. Simulation results are presented which demonstrate that, for the AWGN channel model used, the complementary coded signals can provide improved performance over PN coded signals in practical pulsed radar systems.< >

关键词： Performance analysis AWGN Autocorrelation signal resolution Space vector pulse width modulation Radar signal processing Radar detection Pulse compression methods Spread spectrum radar Additive white noise

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