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International Conference on Space Information technology

作者： Zhu, Mengyu Yang, Yuliang Li, Dongxia Department of Electronic Engineering Bejing Institute of Technology Bejing 100081 China Department of Communication Engineering University of Science and Technology Bejing Bejing 100083 China Key Lab. for Advanced Signal Processing Civil Aviation University of China Tianjin 300300 China

ISBN: (纸本)0819460079

Recognition of the interesting targets is the key techniques of precise guided weapon systems. Because fractal dimension is an interesting textual feature of an image, it has been used in many pattern recognition applications including classification and segmentation. According to the fractal feature of man-made objects in infrared images, a new algorithm is presented to detect the airplanes in this paper. And then we can partition and identify the potential targets using this fractal algorithm. Simulations illustrate that the airplane is successfully identified with the algorithm. The algorithm only requires moderate operations, so it is easy to be implemented for automatic target detection in real-time systems. The results of the experiments show that the fractal dimension can efficiently reflect the object surface complexity or irregularity in images. The algorithm is a powerful tool in identifying airplanes from infrared images.

关键词： Object recognition

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Modified color co-occurrence matrix for image retrieval 1

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First International Conference on Natural Computation, ICNC 2005

作者： Chang, Min Hyuk Pyun, Jae Young Ahmad, Muhammad Bilal Chun, Jong Hoon Park, Jong An Dept. of Information and Communications Engineering Chosun University Gwangju Korea Republic of Signal and Image Processing Lab. Dept. of Mechatronics Gwangju Institute of Science and Technology Gwangju Korea Republic of Dept. of Computer Information and Communication Eng. Jeonnam Provincial Collage Jeonnam Korea Republic of

ISBN: (数字)9783540318583

ISBN: (纸本)9783540283256

Color correlogram for content-based image retrieval (CBIR) characterizes not only the color distribution of pixels, but also the spatial correlation of pairs of colors. Color not only reflects the material of surface, but also varies considerably with the change of illumination, the orientation of the surface, and the viewing geometry of the camera. The invariance to these environmental factors is not considered in most of the color features in color based CBIR including the color correlogram. However, pixels changed their color with almost same proportions with change of environmental factors. This fact is taken into consideration, and new algorithm is proposed. The color cooccurrence matrix for different spatial distances is defined based on the maximum/minimum of color component between the three components (R,G,B) of a pixel. The proposed algorithm has less number of features, and the change of illumination, etc. is also taken into account. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Image retrieval

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Artificial bandwidth expansion method to improve intelligibility and quality of AMR-coded narrowband speech

Artificial bandwidth expansion method to improve intelligibi...

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2005 IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP '05

作者： Laaksonen, Laura Kontio, Juho Alku, Paavo Nokia Research Center Multimedia Technologies Laboratory P.O.Box 407 00045 Nokia Group Finland Helsinki University of Technology Lab. of Acoustics and Audio Signal Processing P.O.Box 3000 02015 HUT Finland

ISBN: (纸本)0780388747

Speech quality suffers from limited bandwidth of cellular telephone systems, making it sound muffled. In addition, intelligibility is degraded due to missing higher frequency components. The proposed enhancement system is designed to improve both intelligibility and quality of narrowband speech by expanding the bandwidth and creating new spectral components to high frequencies in the receiving end of the transmission link. The algorithm can be used together with conventional narrowband speech codecs and it is designed to be robust in different noise conditions. In addition, the computational load of the algorithm is reasonable. © 2005 IEEE.

关键词： Speech intelligibility

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Energy behavior in time-varying fractional delay filters for physical modeling synthesis of musical instruments

Energy behavior in time-varying fractional delay filters for...

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2005 IEEE International Conference on Acoustics, Speech, and signal processing, ICASSP '05

作者： Pakarinen, Jyri Karjalainen, Matti Välimäki, Vesa Bilbao, Stefan Helsinki University of Technology Lab. of Acoustics and Audio Signal Processing P.O.Box 3000 FI-02015 HUT Finland Sonic Arts Research Centre Queens University Belfast BT7 1NN United Kingdom

ISBN: (纸本)0780388747

Time-varying fractional delays are applied for example in physics-based modeling of musical instruments, particularly for string and wind instruments. While Lagrange interpolation and allpass filters are used routinely in such sound synthesis models, they are found somewhat problematic for example in plucked string simulation when the length of the string is varied due to glissando or vibrato. There can be problems with signal energy levels and aliasing. In this paper we study two variable delay filter designs that have physically realistic energetic behavior and keep undesirable side effects, such as aliasing, in control. The first one is sliding termination point simulation with energy correction and the second one is based on controllab.e wave digital filter delay lines. ©2005 IEEE.

关键词： Time varying networks

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Robust compression and reconstruction of 3-D mesh data

Robust compression and reconstruction of 3-D mesh data

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Multimedia Systems and Applications VIII

作者： Park, Sung-Bum Kim, Chang-Su Lee, Sang-Uk Signal Processing Lab. School of Electrical Engineering and Computer Science Seoul National University Seoul 151-741 Korea Republic of Department of Electronics and Computer Engineering Korea University Seoul Korea Republic of School of Electrical Engineering and Computer Science Seoul National University San 56-1 Shillim-dong Gwanak-gu Seoul 151-742 Korea Republic of

ISBN: (纸本)0819460397

An algorithm for robust transmission of compressed 3-D mesh data is proposed in this work. In the encoder, we partition a 3-D mesh adaptively according to the surface complexity, and then encode each partition separately to reduce the error propagation effect. To encode joint boundaries compactly, we propose a boundary edge collapse rule, which also enables the decoder to zip partitions seamlessly. In the decoder, an error concealment scheme is employed to improve the visual quality of corrupted partitions. The concealment algorithm utilizes the information in neighboring partitions and reconstructs the lost surface based on the semi-regular connectivity reconstruction and the polynomial interpolation. Simulation results demonstrate that the proposed algorithm provides a good rendering quality even in severe error conditions.

关键词： Image reconstruction

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DWT-based phonetic groups classification using neural networks

DWT-based phonetic groups classification using neural networ...

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

作者： T.V. Pham G. Kubin Signal Process. & Speech Commun. Lab. Technische Univ. Graz Austria Signal Processing and Speech Communication Laboratory University of Technology Graz Austria

This paper presents an improvement of the discrete wavelet transform (DWT)-based phonetic classification algorithm by using neural networks (NN) to learn optimal thresholds for speech classification. Two feedforward NNs (two layers) operate on input features extracted from speech frames (10 ms length) by DWT and statistical measurement in order to classify these frames as transient, voiced vowel, voiced consonant and unvoiced consonant categories. Hard thresholds in our earlier paper are used to detect silence and voiced closure intervals. The new algorithm is tested with the TIMIT database and compared with other algorithms to demonstrate its superior performance.

关键词： Discrete wavelet transforms Neural networks signal processing algorithms Speech processing Multiresolution analysis Speech coding Backpropagation algorithms signal processing Oral communication lab.ratories

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Cost-Performance Co-Analysis in VLSI Implementation of Existing and New Defuzzification Methods

Cost-Performance Co-Analysis in VLSI Implementation of Exist...

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International Conference on Computational Intelligence for Modelling, Control and Automation, and International Conference on Intelligent Agents, Web Technologies and Internet Commerce

作者： A. Banaiyan S.M. Fakhraie H.R. Mahdiani Silicon Intelligence and VLSI Signal Processing Lab University of Tehran Iran Computer and Electronics Department Power and Water University of Technology Iran

In this paper, three novel defuzzification methods are presented which are appropriate for low-cost hardware implementations. An elab.rate set of ten different defuzzification methods including our three newly-proposed ones are introduced. The C models for all of these methods are prepared for the accuracy-analysis simulations. The HDL models are also developed and synthesized to analyze the implementation cost of each method. This makes it possible to compare the accuracy of these different methods while considering their VLSI implementation costs. The accuracy analysis simulations are performed on six different sets of output fuzzy membership functions with various features to achieve more general and reliable results. A two-dimensional diagram of cost-accuracy analysis is introduced which helps the designers to choose the defuzzification method which best suits their application

关键词： Very large scale integration Hardware Costs Fuzzy control Fuzzy set theory Fuzzy systems Power demand Application software Power engineering computing Analytical models

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The Applications of Generalized Computing In Knowledge Management

The Applications of Generalized Computing In Knowledge Manag...

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2005年公共管理国际会议

作者： YAO Min SHEN Bin ZHANG Yan-gu College of Computer Zhejiang University Provincial Key Lab. for Computer Information processing Technology in Jiangsu Suzhou University School of Computer Wenzhou Normal College

Generalized computing is a new kind of intelligent computing systems, which combines symbolic intelligence and computational intelligence (including neural computing, fuzzy computing and evolutional computing) together. By introducing generalized computing into knowledge management, this paper presents a kind of knowledge decision-making model, and a kind of control model of enterprise knowledge flow.

关键词： Generalized computing, Knowledge management, Enterprise management

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RAIM performance in presence of multiple range failures

RAIM performance in presence of multiple range failures

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Institute of Navigation, 2005 National Technical Meeting, NTM 2005

作者： Macabiau, Christophe Gerfault, Bertrand Nikiforov, Igor Fillatre, Lionel Roturier, Benoit Chatre, Eric Raimondi, Mathieu Escher, Anne-Christine ENAC THALES UTT STNA GJU Application of Satellite Navigation Techniques to Civil Aviation University of Technology of Troyes Institute of Computer Sciences and Engineering of Troyes FRE CNRS 2732 GNSS Navigation Subdivision STNA Galileo Joint Undertaking Eurocae WG 62 Signal Processing Lab ENAC

It is currently stated and widely accepted by industry and users that the RAIM is designed to provide timely warnings in the situation where only one of the range measurements used at the current epoch is affected by an unacceptable bias. However, given the range of potential applications of RAIM in the future, in particular with the advent of Galileo and the generalization of Safety of Life applications, which should spread from the civil aviation community to many other professional sectors, it is very important to better understand the fundamental properties of RAIM, and in particular the potential of RAIM to detect multiple failures on range measurements. The purpose of the study presented in this paper is to analyze the performance of a RAIM in the presence of multiple simultaneous range errors. In particular, we conduct a theoretical analysis to determine in which cases the Least Squares Residuals RAIM detection criterion is not affected, and analyzed results of Monte-Carlo simulations in presence of up to four range failures. The theoretical analysis outlined above aims at determining in what conditions the Least Squares Residuals RAIM detection criterion remains unaffected by multiple range failures, searching for what we call criterion unaffecting range errors. We show that, provided the satellite constellation does not have any degenerated geometrical properties, the dimension of the vector sub-space of these criterion unaffecting errors is max(4-(N-p),0), where N is the number of tracked satellites and p is the number of faulty pseudorange measurements. The immediate conclusion is that if N-4 pseudo range measurements are affected, or less than that, by a large error, there exists no error that will not affect the RAIM detection criterion, and globally due to the negligible probability that unintentional interference lies in a small dimension sub-space, the RAIM detection criterion exhibits a natural detection capability even if up to N-2 pseudo-range mea

关键词： Navigation

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Processor Enhancements for Media Streaming Applications

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Journal of VLSI signal processing systems for signal, image and video technology 2005年第2期41卷 225-234页

作者： Bilavarn, S. Debes, E. Vandergheynst, P. Diguet, J. P. Signal Processing Institute Swiss Federal Institute of Technology (EPFL) Switzerland Architecture Research Lab Intel U.S.A. Lab. of Electronics and REal Time Systems LESTER University of South Britanny U.S.A.

The development of more processing demanding applications on the Internet (video broadcasting) on one hand and the popularity of recent devices at the user level (digital cameras, wireless videophones, ...) on the other hand introduce challenges at several levels. Today, such devices present processing capabilities and bandwidth settings that are inefficient to manage scalab.e QoS requirements in a typical media delivery framework. In this paper, we present an impact study of such a scalab.e data representation optimized for QoS (Matching Pursuit 3D algorithms) on processor architectures to achieve the best performance and power efficiency. A review of state of the art techniques for processor architecture enhancement let us expect promising opportunities from the latest developments in the reconfigurable computing research field. We present here the first design steps of an efficient reconfigurable coprocessor especially designed to cope with future video delivery and multimedia processing requirements. Architecture perspectives are proposed with respect to low development cost constraints, backward compatibilty and easy coprocessor usage using an original strategy based on a hardware/software codesign methodology.

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