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2002 International Symposium of ISPRS Commission III on Photogrammetric computer Vision, PCV 2002

作者： Polec, J. Pavlovicová, J. Vanya, R. Karlubíková, T. Maslik, E. Partyk, M. Department of Telecommunications Faculty of Electrical Engineering and Information Technology Slovak University of Technology Ilkovicova 3 Bratislava812 19 Slovakia Department of Computer Graphic and Image Processing Faculty off Mathematic Physic and Informatics Commenius University Bratislava Slovakia

Our approach to image region approximation offers a complete scheme consisting from few steps. The original image is segmented using an unsupervised colour - texture regions segmentation method. Following polygonal approximation of created regions causes the region boundaries degradation. This approximation has not any important influence to the image quality and enables increasing of code efficiency. Especially for very low bit rates image coding we achieved better values of objective criteria (PSNR). For texture approximation we use the 2D shape independent orthogonal transform (DCT II.). The encoding and decoding of polygons is very efficient, because we need to store only the endpoints of them. The texture is coded with modified code similar to JPEG arithmetic code. © 2002 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Textures

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Regularized covariance estimators for hyperspectral data classification and its application to feature extraction

Regularized covariance estimators for hyperspectral data cla...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Bor-Chen Kuo D.A. Landgrebe Department of Mathematic Education National Taichung Teachers College Taichung Taiwan School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

The main purpose of this work is to find an improved regularized covariance estimator of each class with the advantages of LOOC, and BLOOC, which are useful for high dimensional pattern recognition problems. The searching ranges of LOOC and BLOOC are between the linear combinations of three pair covariance estimators. The first proposed covariance estimator (mixed-LOOC1) extended the searching range and is a general case of LOOC and BLOOC. By observing that the optimal value of leave-one-out likelihood function of LOOC usually occurs at near the end point of the parameter domain, the second covariance estimator (mixed-LOOC2), which needs less computation, was proposed. Using the proposed covariance estimator to improve the linear feature extraction methods when the multivariate data are singular or nearly so is demonstrated.

关键词： Hyperspectral imaging Covariance matrix Application software Feature extraction Bayesian methods Maximum likelihood estimation mathematics computer science education Educational institutions Life estimation

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Hyperspectral data classification using nonparametric weighted feature extraction

Hyperspectral data classification using nonparametric weight...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

In this paper, a new nonparametric feature extraction method is proposed for high dimensional multiclass pattern recognition problems. It is based on a nonparametric extension of scatter matrices. There are at least two advantages to using the proposed nonparametric scatter matrices. First, they are generally of full rank. This provides the ability to specify the number of extracted features desired and to reduce the effect of the singularity problem. This is in contrast to parametric discriminant analysis, which usually only can extract L-1 (number of classes minus one) features. In a real situation, this may not be enough. Second, the nonparametric nature of scatter matrices reduces the effects of outliers and works well even for non-normal data sets. The new method provides greater weight to samples near the expected decision boundary. This tends to provide for increased classification accuracy.

关键词： Hyperspectral imaging Feature extraction Scattering Covariance matrix Data mining mathematics computer science education Educational institutions Pattern recognition

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Generation of broadband response for the ground bounce

Generation of broadband response for the ground bounce

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IEEE Topical Meeting on Electrical Performance of Electronic Packaging (EPEPS)

作者： Jin-Lin Hu Chi Hou Chan T.K. Sarkar Department of Applied Mathematic Northwestern Polytechnical University Xi'an China Wireless Communication CenterDepartment of ElectricalEngineering City University of Hong Kong Kowloon Hong Kong China Department of Electrical and Computer Engineering Syracuse University Syracuse NY USA

In this paper, an ultrawideband response for the ground bounce problem in electronic packaging is generated by using a simultaneous interpolation and extrapolation algorithm in the time and frequency domains. This is carried out by an associate Hermite (AH) expansion. Due to the isomorphism of the AH function and its Fourier transform, the time-domain signal and its corresponding frequency-domain signal can be expanded as two isomorphic associate Hermite expansions, that can be used for simultaneous interpolation and extrapolation in the time- and frequency-domains from the partial sampled data of the two waveforms in time and frequency domains. An example is presented to illustrate the efficacy of this new technique.

关键词： Fourier transforms Frequency domain analysis Extrapolation Hybrid power systems Interpolation Polynomials Wireless communication mathematics Ultra wideband technology Time domain analysis

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Design issues for a trusted electronic document management system

Design issues for a trusted electronic document management s...

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： J.S. Richard M.H. Rahman S.M. Thomas Department of Electrical & Computer Engineering Royal Military College of Canada Kingston ONT Canada Department of Mathematic & Computer Science Royal Military College of Canada Kingston ONT Canada

This paper describes the issues related to the design of a trusted electronic document management system (TEDMS). The computer security issues and background research that lead to the final design of a TEDMS application are also discussed. The major component of an electronic document management system (EDMS) is the database in which the documents' metadata are kept. In a TEDMS, this database becomes a multilevel secure (MLS) database. The challenge of this design is to regroup MLS database design and trusted application design in one homogeneous application.

关键词： Application software Multilevel systems Data security computer security Military computing Database systems Educational institutions National security Government computer architecture

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Formal Real-Time Imagination

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Fundamenta Informaticae 1995年第2-4期23卷 371-394页

作者： Nirkhe, Madhura Kraus, Sarit Department of Electrical Engineering University of Maryland College ParkMD20742 United States Department of Mathematic and Computer Science Bar Han University Ramat Gan52900 Israel

Formal real-time imagination is a term that may curiously describe the activities of a commonsense agent in a real-time setting in general, and in a tight deadline situation in particular. We briefly describe an ‘active-logic' mechanism that fits this description. Temporal projection is an essential component of realtime planning. We draw a parallel between imagination as we understand it in human context and the capacity of the automated agent to formulate mental images of possible scenarios and plans of action in the course of its reasoning. We outline a treatment of temporal issues of significance to a time-situated reasoning mechanism in a dynamic setting with deadlines. The Yale shooting problem is a benchmark problem in temporal reasoning. We demonstrate how the active-logic planning mechanism successfully handles some interesting real-time variants of the Yale shooting problem. The solutions to each of these illustrate the agent's ability to form contexts within which to reason, to project in each context thus formed by applying default inferences, and to revise and extend its conclusions within each context by applying time-sensitive inference rules, and most importantly, to account for all the time spent in the process. © 2023 IOS Press. All rights reserved.

关键词： Computational methods

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Nonlinear analysis of condensed-phase surface combustion

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European Journal of Applied mathematics 1990年第1期1卷 73-89页

作者： Garbey, Marc Kaper, Hans G. Leaf, Gary K. Matkowsky, Bernard J. Department of Mathematics Ecole Normale Superieure de Lyon 69364 Lyon cedex 07 France Mathematic and Computer Science Division Argonne National Laboratory Argonne IL 60439-4801 United States Department of Engineering Sciences and Applied Mathematics Northwestern University Evanston IL 60208 United States

This article is concerned with the structure and stability properties of a combustion front that propagates in the axial direction along the surface of a cylindrical solid fuel element. The fuel consists of a mixture of two finely ground metallic powders, which combine upon ignition in a one-step chemical reaction. The reaction is accompanied by a melting process, which in turn enhances the reaction rate. The combustion products are in the solid state. The reaction zone, inside which the melting occurs, is modelled as a front that propagates along the surface of the cylinder. The different modes of propagation that have been observed experimentally (such as single- and multiheaded spin combustion and multiple-point combustion) are explained as the results of bifurcations from a uniformly propagating plane circular front. The stability properties of the various modes are discussed. © 1990, Cambridge University Press. All rights reserved.

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Compression of text and binary files using adaptive Huffman coding techniques

Compression of text and binary files using adaptive Huffman ...

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IEEE Southeastcon

作者： A. Desoky M. Gregory Department of Engineering Mathematic and Computer Science University of Louisville Louisville KY USA

The authors measure the amount of compression that can be accomplished by the use of Huffman coding, and the effects of adaption based on the statistics of the input file. The coding algorithm has been designed to generate codes for character strings instead of for a single character. Each compressed file has a unique set of Huffman codes. The results of using adaptive Huffman coding algorithm has demonstrated that the larger the file the more useful the technique for compression. Also, the results show that the amount of memory that can be saved is up to 55.0% when text file is being used, and up to 40.9% when binary image file is being used.< >

关键词： Huffman coding Image coding Entropy Probability computer errors Data compression Memory management mathematics computer science Statistics

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Optimal control and pathwise nonlinear filtering of nondegenerate diffusions

Optimal control and pathwise nonlinear filtering of nondegen...

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IEEE Conference on Decision and Control

作者： Wendell H. Fleming Sanjoy K. Mitter Lefschetz Center for Dynamical Systems Division of Applied Mathematic Brom University Providence RI USA Department of Electrical Engineering and Computer Science and Laboratoryfor Information and Decision Systems Massachusetts Institute of Technology Cambridge MA USA

A linear parabolic partial differential equation describing the pathwise filter for a nondegenerate diffusion is changed, by an exponential substitution, into the dynamic programming equation of an optimal stochastic control problem. This substitution is applied to obtain results about the rate of decay as |x| → ∞ of solutions p(x, t) to the pathwise filter equation, and for solutions of the corresponding Zakai equation.

关键词： Optimal control Filtering Filters Polynomials Partial differential equations Dynamic programming Stochastic processes Signal processing Nonlinear equations mathematics

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