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IEE Proceedings - Vision, Image and Signal Processing

Issue 1 • Date 5 Feb. 2004

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Displaying Results 1 - 12 of 12
  • New matching pursuit based sinusoidal modelling method for audio coding

    Publication Year: 2004, Page(s):21 - 28
    Cited by:  Papers (5)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (351 KB)

    A new method is proposed to improve sinusoidal modelling based on energy-adaptive matching pursuits. To reduce the complexity of the algorithm, an over-complete dictionary composed of complex exponentials is used and an efficient implementation is presented. An analysis-synthesis windows scheme that avoids overlapping is also proposed. For efficient quantisation of sinusoidal model parameters, a n... View full abstract»

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  • Editorial -Nonlinear and non-gaussian signal processing

    Publication Year: 2004, Page(s):29 - 30
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (205 KB)

    First Page of the Article
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  • Dictionary redundancy elimination

    Publication Year: 2004, Page(s):31 - 34
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (219 KB)

    Two criteria for dictionary redundancy elimination are discussed. One of them operates by disregarding linearly dependent atoms, whilst the other selects linearly independent atoms. The latter is implemented by the modified Gram-Schmidt orthogonalisation with pivoting technique, and is suitable for handling the effect of 'quasi-linear dependence', most likely to be present in a redundant dictionar... View full abstract»

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  • Analysis of high-resolution land clutter

    Publication Year: 2004, Page(s):86 - 91
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (548 KB)

    Results are presented of an analysis of land clutter from the fixed site high-resolution BYSON radar at Malvern. Digital terrain elevation data are used to determine the imaged ground regions and the normalised-log estimator U is measured to investigate the stability of the long-tailed clutter distribution. Operational target detectors must maintain a constant false alarm rate over the entire scen... View full abstract»

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  • New natural gradient algorithm for cyclostationary sources

    Publication Year: 2004, Page(s):62 - 68
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (277 KB)

    A new natural gradient type algorithm (NGA) for the separation of cyclostationary sources is introduced. Based on the interpretation of blind source separation (BSS) as a two-stage process, including prewhitening and rotation, the cyclostationary NGA (CSNGA) algorithm is constructed such that it also ensures that the recovered sources are decorrelated in the cyclostationary sense. The method is ge... View full abstract»

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  • Exploiting non-Gaussianity in blind identification and equalisation of MIMO FIR channels

    Publication Year: 2004, Page(s):69 - 75
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (302 KB)

    The problem of blind identification and equalisation (BIE) of finite impulse response (FIR) channels in multiuser digital communications is investigated. The non-Gaussian nature and statistical independence of the users' data streams is exploited by resorting to blind signal separation (BSS) based on higher-order statistics (HOS). Two such techniques are put forward. The first technique is compose... View full abstract»

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  • Plane curve matching under affine transformations

    Publication Year: 2004, Page(s):9 - 19
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (330 KB)

    It is common to use an affine transformation to approximate the plane curve matching problem under a projective transformation. The plane curve itself can be used as an identity to solve the parameters of an affine transformation. The objective of the paper is to obtain a closed form solution to the transformation parameters using lower order derivatives of a plane curve. A unique solution to the ... View full abstract»

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  • Adaptive minimum bit-error-rate filtering

    Publication Year: 2004, Page(s):76 - 85
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (329 KB)

    Adaptive filtering has traditionally been developed based on the minimum mean square error (MMSE) principle and has found ever-increasing applications in communications. The paper develops adaptive filtering based on an alternative minimum bit error rate (MBER) criterion for communication applications. It is shown that the MBER filtering exploits the non-Gaussian distribution of filter output effe... View full abstract»

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  • Simple mixture model for sparse overcomplete ICA

    Publication Year: 2004, Page(s):35 - 43
    Cited by:  Papers (33)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    The use of mixture of Gaussians (MoGs) for noisy and overcomplete independent component analysis (ICA) when the source distributions are very sparse is explored. The sparsity model can often be justified if an appropriate transform, such as the modified discrete cosine transform, is used. Given the sparsity assumption, a number of simplifying approximations are introduced to the observation densit... View full abstract»

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  • Blind restoration of nonlinearly mixed signals using multilayer polynomial neural network

    Publication Year: 2004, Page(s):51 - 61
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    It is shown how nonlinearly mixed signals can be retrieved uniquely by using a novel approach based on signal restoration methodology rather than the conventional technique of mere signal separation. A new mathematical model of the nonlinear mixing system has been developed culminating in the formulation of a stable unique inverse solution, which has an identical structure to the multilayer neural... View full abstract»

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  • New direct design method for weighted order statistic filters

    Publication Year: 2004, Page(s):1 - 8
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (724 KB)

    The paper describes a new method for the design of optimum weighted order statistic (WOS) filters. WOS filters form a general class of increasing filters which generate an output based on the weighted rank ordering of the samples within the filter window. They include the median, weighted median, stack filters and morphological filters with flat structuring elements. This new design method is appl... View full abstract»

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  • Analysis and pruning of nonlinear auto-association networks

    Publication Year: 2004, Page(s):44 - 50
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (270 KB)

    In the paper, an analysis of a three-layer nonlinear auto-association network with linear output neurons and sigmoidal hidden neurons is carried out. Simulations have shown that the hidden layer neurons of this network operate mainly in their linear region. By studying the statistical relations governing the operation of such a network, the nearly linear behaviour of the sigmoidal hidden neurons w... View full abstract»

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