2004 International Conference on Communications, Circuits and Systems (IEEE Cat. No.04EX914)

27-29 June 2004

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  • Patch-based multi-resolution real-time texture synthesis in wavelet domain

    Publication Year: 2004, Page(s):788 - 791 Vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (515 KB) | HTML iconHTML

    Texture synthesis has been studied for many years, but it is still difficult to achieve real-time implementation and high quality simultaneously. We present a discrete-wavelet-transform (DWT) based multi-resolution technique for synthesizing high quality textures in real-time. In the wavelet domain, our algorithm first generates randomly an initial texture patch from the input texture picture and ... View full abstract»

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  • Dim small target detection in strong undulant clutter background based on adaptive filter

    Publication Year: 2004, Page(s):783 - 787 Vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (395 KB) | HTML iconHTML

    A method, based on adaptive filtering, is proposed to detect dim small moving targets in strong undulant clutter background. This method utilizes the difference between target and clutter with regard to statistical characteristics, the consistency of the moving target's trajectory, and the random fluctuation of noise. After the elimination of clutter, the original correlated image is reduced to an... View full abstract»

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  • The target IF signals simulation of three-dimensional radar

    Publication Year: 2004, Page(s):780 - 782 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (278 KB) | HTML iconHTML

    To provide a test platform for EW systems, the TDRSS (three-dimensional radar simulation system) was developed. The paper discusses the target signal simulation in TDRSS; simulation results prove that the algorithm could accurately represent the target IF return of three-dimensional radar. View full abstract»

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  • Conjugate gradient approach to blind separation of temporally correlated signals

    Publication Year: 2004, Page(s):1008 - 1012 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (411 KB) | HTML iconHTML

    The paper investigates the information geometry of the blind separation of temporally correlated signals. First, we introduce the Lie group and Riemannian metric to the manifold of nonsingular matrices. The explicit expression of the geodesic on the manifold is obtained. Furthermore, we introduce the concept of parallel translation of tangent vectors along the geodesic, which is necessary for impl... View full abstract»

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  • Research on fast synthetic aperture imaging method for ground penetrating radar in subsurface object detection

    Publication Year: 2004, Page(s):777 - 779 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (347 KB) | HTML iconHTML

    The paper analyzes the received data of shallow subsurface ground penetrating radar (GPR), and proposes to decide the useful information distribution area in the whole received data by the variance characteristic and A-scan energy of the data. A new fast synthetic aperture imaging (SAI) method is achieved by using only those useful GPR data. The results of processing experimental data show that th... View full abstract»

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  • Blind source extraction in various ill-conditioned cases

    Publication Year: 2004, Page(s):1004 - 1007 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (353 KB) | HTML iconHTML

    The paper discusses blind source extraction in various ill-conditioned cases based on a simple extraction network model. Extractability is first analyzed for the following ill-conditioned cases: the mixing matrix is square but-singular; the number of sensors is smaller than that of sources; the number of sensors is larger than that of sources, but the column rank of the mixing matrix is deficient;... View full abstract»

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  • Improved simulated annealing mechanics in transiently chaotic neural network

    Publication Year: 2004, Page(s):1057 - 1060 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB) | HTML iconHTML

    The paper analyses the dynamic characteristics of transiently chaotic neural networks (TCNN), finding that they quite sensitively depend on the value of the self-feedback connection weights, and researches the annealing function that intensively influences the veracity and search speed of the TCNN model. Improved simulated annealing mechanics are proposed for the value of the self-feedback connect... View full abstract»

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  • FIR filter optimization as preemphasis of high-speed backplane data transmission

    Publication Year: 2004, Page(s):773 - 776 Vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB) | HTML iconHTML

    FIR filter preemphasis has been used to counteract intersymbol interference (ISI) in high-speed backplane data transmission. Backplane channel characteristics are first analyzed. It is found that channel group delay distortion is also a major ISI contributor in addition to amplitude attenuation. A MATLAB program is then described for optimization of the FIR filter under the LMS criterion. Both sym... View full abstract»

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  • A non-data-aided SNR estimation algorithm for QAM signals

    Publication Year: 2004, Page(s):999 - 1003 Vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB) | HTML iconHTML

    We propose a non-data-aided (NDA) signal-to-noise-ratio (SNR) estimation algorithm for quadrature amplitude modulation (QAM) signals in an additive white Gaussian noise (AWGN) channel. The NDA SNR estimation algorithm for QAM signals is derived based on a statistical ratio of observables over a block of data. The simple analysis and computer simulation for some kinds of QAM signals have been done,... View full abstract»

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  • Medical image segmentation based on Mumford-Shah model

    Publication Year: 2004, Page(s):942 - 945 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB) | HTML iconHTML

    Segmentation of medical images has become an indispensable process to quantitative analysis of images of human organs and their functions. In this paper, we discuss a novel approach to the segmentation of medical images. The Mumford-Shah model segmentation problem can be solved using the level set method. The new model can detect objects whose boundaries are not necessarily defined by gradient, as... View full abstract»

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  • Global convergence analysis of a PCA learning algorithm

    Publication Year: 2004, Page(s):1052 - 1056 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (345 KB) | HTML iconHTML

    Principal component analysis (PCA) by neural network is an adaptive statistical signal processing method which has many applications. Since many PCA neural networks do not converge globally, it is natural to study the global convergence of the PCA learning algorithm. Previous work on globally convergent PCA neural networks is presented first. Then, based on the mismatch of previous PCA neural netw... View full abstract»

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  • Noise, spur characteristics and in-lock error reduction of DLL-based frequency synthesizers

    Publication Year: 2004, Page(s):1443 - 1446 Vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (379 KB) | HTML iconHTML

    Noise transfer characteristics of a delay-locked loop and the spur characteristics of a DLL-based frequency synthesizer are analyzed in this paper. Analysis shows that the DLL itself has no ability to suppress the external noise and the in-lock error greatly affects the output spur of a DLL-based frequency synthesizer. The technique for in-lock error reduction, which employs a highly symmetric cha... View full abstract»

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  • Speech source localization in near field

    Publication Year: 2004, Page(s):769 - 772 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (307 KB) | HTML iconHTML

    In array signal processing, a plane wave and uncorrelated signal sources are assumed for the sake of simplicity (far-field and independent signal sources assumption). However, this far-field assumption does not always hold for a microphone array, resulting in distortion in the array output. The performance of DOA estimation is poor in the case of correlated signal sources. A microphone array model... View full abstract»

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  • Aligning multiple sequences by genetic algorithm

    Publication Year: 2004, Page(s):994 - 998 Vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (354 KB) | HTML iconHTML

    The paper presents a genetic algorithm for solving multiple sequence alignment in bioinformatics. The algorithm involves four different operators, one type of selection operator, two types of crossover operators, and one type of mutation operator; the mutation operator is realized by a dynamic programming method. Experimental results of benchmarks from the BAliBASE show that the proposed algorithm... View full abstract»

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  • An efficient and practical method for generating arbitrary narrow pulses

    Publication Year: 2004, Page(s):1481 - 1484 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (313 KB) | HTML iconHTML

    A technique to generate arbitrary narrow pulses is developed by using microstrip circuits. The developed pulse duration can be the order of picoseconds and be adjustable. The primary principle is using wave multi-reflection features in a nonuniform transmission line to obtain the desired amplitude waveform. Combining the reflection and transmission coefficients at each discontinuity, general formu... View full abstract»

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  • An adaptive cross search algorithm for block matching motion estimation

    Publication Year: 2004, Page(s):914 - 918 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (357 KB) | HTML iconHTML

    Motion estimation plays an important role in the motion compensated video coding framework. Due to the high computational complexity of the exhaustive search, many sub-optimal fast search algorithms, aiming to achieve the best trade off between distortion and search speed, are proposed. We observe that the distortion gradient of a search point on the block distortion surface (BDS) monotonously dec... View full abstract»

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  • A robust level set framework for medical image segmentation

    Publication Year: 2004, Page(s):937 - 941 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (466 KB) | HTML iconHTML

    In this paper, a new speed function of level set framework is presented. The region information, instead of the image gradient information, is fused into the level set fundamental model to improve the robustness of the segmentation for medical images. This new speed function is particularly well adapted to situations where edges are weak and overlap. A number of experiments on ultrasound (US), CT,... View full abstract»

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  • Hopf bifurcation existence in a delayed neural equation control system

    Publication Year: 2004, Page(s):1047 - 1051 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (339 KB) | HTML iconHTML

    The characteristic equation of a discrete time-delayed continuous system contains the terms of an exponential function with respect to eigenvalues, i.e. the characteristic equation is a transcendental equation. That makes it hard to obtain the conditions for Hopf bifurcation to occur. A system for controlling a neural equation with discrete time delay based on the washout filter is presented. The ... View full abstract»

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  • Design of AMBA™ wrappers for multiple-clock operations

    Publication Year: 2004, Page(s):1438 - 1442 Vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (415 KB) | HTML iconHTML

    AMBA™ (advanced microcontroller bus architecture) is a widely-used on-chip bus standard proposed by ARM. The AMBA™ protocol assumes that all IPs are synchronized by a common clock. However, real-world SoCs often require IPs to run at different clock frequencies. The paper proposes a novel AMBA™-based SoC architecture that allows the integration of IPs with different operating fre... View full abstract»

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  • A new robust quadratic constraint beamforming against array steering vector errors

    Publication Year: 2004, Page(s):765 - 768 Vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (318 KB) | HTML iconHTML

    A new robust adaptive beamforming based on quadratic constraint is presented; it is a robust extension of Capon's minimum variance distortionless response (MVDR) beamforming algorithm. The quadratic constraint is added to the weighted least squared error between the desired and the actual beam patterns over a small region near the array steering direction, which makes the array less sensitive to s... View full abstract»

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  • Real-time road lane recognition using fuzzy reasoning for AGV vision system

    Publication Year: 2004, Page(s):989 - 993 Vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (367 KB) | HTML iconHTML

    The automatic guided vehicle (AGV) vision system is an important research area in computer vision. In order to recognize the road lane quickly and effectively, this paper presents an algorithm using fuzzy reasoning based on the Hough transform to solve this problem, which improves the entire system's real-time performance. After our tests on the test vehicle, this method can speed up the road lane... View full abstract»

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  • Smart SensorDVB: sensor network development boards with smart antennas

    Publication Year: 2004, Page(s):1476 - 1480 Vol.2
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (417 KB) | HTML iconHTML

    As sensor nodes reach cubic millimeter dimensions, it will become more difficult to achieve efficient wireless communication in sensor networks due to size, cost, and power constraints. In this paper we show that the use of smart antennas in millimeter-scale systems is necessary, achievable, and highly desired. A proposed design for sensor network hardware platforms supporting smart antennas is gi... View full abstract»

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  • Constrained growing based variable size block motion estimation

    Publication Year: 2004, Page(s):910 - 913 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (362 KB) | HTML iconHTML

    Most variable size block motion estimation (VSBM) algorithms suffer from intensive computational load resulting from a bottom-up style of motion vector field building. Focusing on this problem, an optimized quad-tree growing VSBM algorithm with top-down style is proposed and a constrained growing VSBM algorithm is presented in detail. An efficient constrained growing algorithm is implemented by a ... View full abstract»

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  • Full contrast transfer function correction in 3D cryo-EM reconstruction

    Publication Year: 2004, Page(s):960 - 964 Vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (454 KB) | HTML iconHTML

    Over the past years electron cryo-microscopy (cryo-EM) has established itself as an important tool in studying the three dimensional structure of biological molecules up to the resolution of 6-9 Å. However, as we pursue even higher resolution (i.e., 3-4 Å), the depth-of-field problem inherent in the contrast transfer function emerges as a limiting factor. This problem has been previous... View full abstract»

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  • Shot boundary detection using unsupervised clustering and hypothesis testing

    Publication Year: 2004, Page(s):932 - 936 Vol.2
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB) | HTML iconHTML

    We propose a shot boundary detection approach based on unsupervised scenelet clustering and hypothesis testing. We define a video scenelet as a short consecutive samples of frames of a video sequence. The approach makes use of a typical k-means clustering algorithm to group the scenelets. Based on the clustering result, hypothesis testing can be performed to identify the shot boundaries at each le... View full abstract»

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