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Pose determination using tree annealing

Pose determination using tree annealing

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： Y.-S. Han W.E. Snyder G.L. Bilbro Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University USA

The problem of pose determination of a surface in a range image is described as a six-degree-of-freedom optimization problem, where the surface is expressed by a quadratic equation. The tree annealing algorithm, a general-purpose technique for finding minima of functions of continuously valued variables, is presented. The technique is applied to the pose determination of analytic surfaces and is shown to be quite effective even in the presence of considerable amounts of noise in the images.< >

关键词： Equations Simulated annealing signal processing algorithms Surface fitting Minimization methods Image sensors Transforms Visualization

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Point pattern matching by a genetic algorithm

Point pattern matching by a genetic algorithm

引用

Annual Conference of Industrial Electronics Society

作者： N. Ansari M.-H. Chen E.S.H. Hou Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

The problem of finding a subset of points in a pattern that best match to a subset of points in another pattern through a transformation in an optimal sense is considered. An exhaustive search to find the best assignment mapping one set of points to another set is, if the number of points that are to be matched is large, computationally expensive. A genetic algorithm that searches for the best ('almost the best') assignment efficiently is described. To map the point pattern matching into the framework of a genetic algorithm, a fitness function that is inversely proportional to the match error and a scheme for encoding an assignment between two sets of points into a string are used, along with a genetic operator known as the mixed-type partial matching crossover. Experimental results have demonstrated the robustness and the fast convergence of the algorithm. The algorithm can be applied to n-dimensional point patterns and any transformation. Results are presented for two-dimensional point patterns and a similarity transformation.< >

关键词： Pattern matching Genetic algorithms signal processing algorithms Shape Robustness Convergence computer vision Pattern recognition Motion estimation Stochastic processes

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A useful and general technique for improving the efficiency of Monte Carlo simulation of digital communication systems

A useful and general technique for improving the efficiency ...

引用

[Proceedings] GLOBECOM '90: IEEE Global Telecommunications Conference and Exhibition

作者： M. Devetsikiotis J.K. Townsend Center for Communications and Signal Processing Department of Electrical & Computer Engineering North Carolina State University Raleigh NC USA

Importance sampling is a potentially powerful method for reducing simulation runtimes when estimating the bit error rate (BER) of communications systems using Monte Carlo simulation. Analytically minimizing the variance of the importance sampling estimator with respect to the biasing parameters has only yielded solutions for systems for which the bit error rate (BER) could be found analytically (i.e., a linear system with additive Gaussian noise). A technique for finding a near-optional set of biasing parameters for the translation biasing scheme is presented. A key feature of this technique is that repetitive, very short simulation runs are used to determine near-optimal translation values. The method is also shown to exploit a theoretically justifiable relationship, for small sample sizes, between the BER estimate and the amount of translation. Only mild assumptions about the noise distribution and system are required. Experimentally, improvement factors ranging from three to eight orders of magnitude are obtained for different avalanche photodiode noise distributions.< >

关键词： Bit error rate Monte Carlo methods Analysis of variance Runtime Communication systems Yield estimation Linear systems Additive noise Gaussian noise Avalanche photodiodes

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Joint echo canceller/equalizer and timing recovery for high speed full duplex baseband transmission systems

Joint echo canceller/equalizer and timing recovery for high ...

引用

MILCOM, Military communications Conference

作者： J. Lee S.H. Ardalan Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

The interaction between echo cancellation/equalization and timing recovery is analyzed, a complete simulation of a high-speed full-duplex digital subscriber loop system is reported, and issues related to the support of multirate sampling and feedback are discussed. The simulation results suggest that the number of equalizer (EQ) training symbols must be reduced, rather than the number of echo canceler (EC) training symbols, to save total EC/EQ training time, regardless of the length of the bridged taps. The pole-zero EC performs much better than the all-zero EC. In the all-zero EC, the system needs more EQ training symbols. Fractionally spaced EC/EQ performs better than symbol rate EC/EQ when the number of EC/EQ training symbols is large. The symbol rate EC/EQ has better or equivalent performance for small number of EC/EQ training symbols, relatively large noise, and long bridged taps. The symbol rate EC/EQ reaches a performance limit however, unlike the fractionally spaced EC/EQ system, for large SNR or large training sequences.< >

关键词： Echo cancellers Equalizers Baseband DSL Sampling methods Timing jitter Circuit simulation Feedback Degradation Data communication

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The joint optimization of transmitter and receiver filters for data transmission systems using mean field annealing

The joint optimization of transmitter and receiver filters f...

引用

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

作者： R.A. Nobakht D.E. Van den Bout J.K. Townsend S.H. Ardalan Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

A technique is presented for finding transmitter and receiver filters for a wide class of data transmission systems which minimize the bit error rate (BER). The techniques uses Monte Carlo simulation to estimate the BER, coupled with mean field annealing (MFA) to optimize the pulse shapes. Modeling of the link can be as complex as simulation will allow, while MFA is resistant to the statistical scatter in the BER estimate from the simulation. In a complex example, MFA is coupled with Monte Carlo simulation techniques to find near optimal transmit and receive filters for a satellite communications link, taking 6 CPU hours on a DECstation 3100. The bit error rate of the link is found to be as much as three orders of magnitude lower when using the MFA-constructed optimal filters than when using filters constructed by gradient descent and simulated annealing.< >

关键词： Transmitters Filters Bit error rate Simulated annealing Data communication Couplings Pulse shaping methods Shape Scattering Satellite communication

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Nonlinear adaptive filtering using annealed neural networks

Nonlinear adaptive filtering using annealed neural networks

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： R.A. Nobakht S.H. Ardalan D.E. van den Bout G.L. Bilbro Center for Communications and Signal Processing Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

A technique for nonlinear adaptive filtering which combines annealed neural networks (ANNs) and conventional recursive-least-squares/fast-transversal-filter (RLS/FTF) adaptive filtering is presented. The technique can efficiently handle large-order nonlinearities with or without memory. The nonlinear channel is divided into a nonlinearity followed by a dispersive linear system. ANN is applied to obtain the coefficients of the nonlinearity, and RLS/FTF is applied to determine the weights of the dispersive linear systems. The proposed technique has better convergence properties than gradient-descent-based methods, such as those based on steepest-descent or Newton's method. The proposed technique is used to solve for the true minimum mean-squared-error estimate, as opposed to solving for an estimate which satisfies suboptimal equations. A simulation example is given which shows the superior performance of the technique compared to that of ordinary RLS/FTF and gradient-descent.< >

关键词： Adaptive filters Annealing Neural networks Resonance light scattering Dispersion Linear systems Artificial neural networks Convergence Newton method Equations

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An improved analysis of Sigma Delta modulators with bandlimited Gaussian inputs

An improved analysis of Sigma Delta modulators with bandlimi...

引用

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

作者： J.T. Stonick S.H. Ardalan J.K. Townsend Center for Communications & Signal Processing Department of Electrical & Computer Engineering North Carolina State University Raleigh NC USA

Three results on Sigma Delta modulation are presented. First, a change of variables is presented that demonstrates that two of the parameters in a Sigma Delta modulator do not affect the system performance. Second, a successive parameterization approach is used to determine the probability density function (PDF) at the input to the quantizer of a second-order Sigma Delta modulator. Third, this calculated PDF is used to determine the minimum mean-square error linearizing gains for a second-order Sigma Delta modulator and an expression for the variance of the noise at the input to the quantizer.< >

关键词： System performance Probability density function

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A neural network model to configure maps for a satellite communication network

A neural network model to configure maps for a satellite com...

引用

[Proceedings] GLOBECOM '90: IEEE Global Telecommunications Conference and Exhibition

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

A self-configurable satellite communication network that can be dynamically configured to different maps, to best meet the network requirements, by means of a modified Kohonen self-organization procedure is described. 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 an analysis of the discrepancy between the chosen exemplar map and the state of the network, and adaptively modifies the chosen exemplar map to conform closely to the network requirement (input data pattern) by Kohonen's self-organization procedure. On the basis of certain performance criteria, it is decided in the third stage whether a new map is generated to replace the original map. Experimental results are presented to demonstrate that the self-organization model can dynamically configure maps for a satellite communication network.< >

关键词： Neural networks Satellite communication Telecommunication traffic Traffic control Satellite broadcasting Routing Costs Communication cables Artificial satellites Satellite ground stations

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Segmentation based image coding using fractals and the human visual system

Segmentation based image coding using fractals and the human...

引用

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

作者： J. Jang S.A. Rajala Department of Electrical and Computer Engineering Center for Communication and Signal Processing North Carolina State University Raleigh NC USA

A new segmentation-based image coding technique which performs segmentation based on roughness of textural regions and on properties of the human visual system (HVS) is presented. The image is segmented into texturally homogeneous region with respect to the degree of roughness as perceived by the HVS. The fractal dimension is used to measure the roughness of the textural regions. The segmentation is accomplished by thresholding the fractal dimension so that textural regions are classified into several classes. Three texture classes are chosen: perceived constant intensity, smooth texture, and rough texture. An image coding system with high compression and good image quality is achieved by developing an efficient coding technique for each texture class.< >

关键词： Image segmentation Image coding Fractals Humans Visual system Image quality

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A COMPARATIVE STUDY OF QUADRATURE SAMPLING AND DIRECT SAMPLING OF BANDPASS signalS

A COMPARATIVE STUDY OF QUADRATURE SAMPLING AND DIRECT SAMPLI...

引用

International Conference on signal processing(ICSP’90)

作者： Chung H.Lu Danmei Chang Ray Chapel Department of Electrical Engineering Center for Communications and Signal Processing Research New Jersey Institute of Technology University Heights NewarkNew Jersey 07102USA

Various techniques have been studied for the sampling of bandpass *** this paper,we present a comparative study of quadrature sampling and direct sampling of bandpass ***,both schemes provide efficient sampling of a bandpass signal at a minimum data rate and at the same time demultiplex the in-phase and quadrature components. In reality,imperfect circuit parameters lead to nonideal sampling, resulting in quadrature *** form relations for quadrature interference for quadrature sampling and direct sampling are derived and *** analysis shows that quadrature interference is inversely proportional to the variance of sampling phase jittering.

关键词： A COMPARATIVE STUDY OF QUADRATURE SAMPLING AND DIRECT SAMPLING OF BANDPASS signalS

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