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IEE Proceedings - Vision, Image and Signal Processing

Issue 5 • Date Oct 1997

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Displaying Results 1 - 8 of 8
  • 3-D tracking and motion estimation using hierarchical Kalman filter

    Publication Year: 1997, Page(s):293 - 298
    Cited by:  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (932 KB)

    The authors present a novel approach to the problem of tracking and reconstructing articulated objects in 3-D space. The newly conceived computational process and its supporting data structure, the hierarchical Kalman filter (HKF) and the adaptive hierarchical structure (AHS). Allow the problem to be treated in a singlet unified framework. There are three novelties in the authors' formulation: red... View full abstract»

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  • Low-delay subband CELP coding for wideband speech

    Publication Year: 1997, Page(s):313 - 316
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    Low-delay techniques are proposed for coding 7 kHz speech using subband code-excited linear predictive coding (CELP). The use of separate and joint index codebooks is compared. Specifically, the joint-index-subband CELP (JISBC) algorithm is found to provide good quality with processing delay in the range 2.375-3.375 ms at corresponding bit rates of 16-8 kbit/s View full abstract»

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  • Designing a fuzzy step size LMS algorithm

    Publication Year: 1997, Page(s):261 - 266
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB)

    A new approach in adjusting the step size of the least mean square (LMS) using the fuzzy logic technique is presented. It extends the earlier work of Gan (see Signal Process., vol.49, no.2, p.145-49, 1996) by giving a complete design methodology and guidelines for developing a reliable and robust fuzzy step size LMS (FSS LMS) algorithm. It also presents a computational study and simulation results... View full abstract»

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  • Identification of cubically nonlinear systems using undersampled data

    Publication Year: 1997, Page(s):267 - 277
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1232 KB)

    A practical technique for identification of cubically nonlinear systems using higher order spectra of the discrete data samples of the system input and output is proposed. This technique differs from the conventional one in that it only requires the sampling frequency for the system output to be equal to twice the bandwidth of the system input, instead of six times the bandwidth of the system inpu... View full abstract»

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  • Sub-pixel non-parametric PSF estimation for image enhancement

    Publication Year: 1997, Page(s):285 - 292
    Cited by:  Papers (2)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (844 KB)

    Applying standard resolution enhancement and sub-pixel measurement techniques to an imaging system is problematic when the system characteristics are not known. The importance of precise system characterisation is often underestimated in resolution enhancement and sub-pixel measurement. The methods presented allow accurate sub-pixel measurements of system characteristics to be made with minimal as... View full abstract»

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  • Extraction of independent signal sources using a deflationary exploratory projection pursuit network with lateral inhibition

    Publication Year: 1997, Page(s):299 - 306
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (976 KB)

    A nonlinear self-organising neural network is proposed, which employs hierarchic linear negative feedback, and this network is applied to the blind separation of independent source signals from their mixtures. Blind separation of sources has become an important area of research, with significant contributions being made from both the statistical signal processing and artificial neural network rese... View full abstract»

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  • Image compression using multilayer neural networks

    Publication Year: 1997, Page(s):307 - 312
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1076 KB)

    A new neural-network data compression method is presented. The work extends the use of two-layer neural networks to multilayer networks. The results show the performance superiority of multilayer neural networks compared with that of the two-layer one, especially at high compression ratios. To overcome the long training time required for multilayered networks, a previously developed training algor... View full abstract»

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  • Fast codeword search algorithm for real-time codebook generation in adaptive VQ

    Publication Year: 1997, Page(s):278 - 284
    Cited by:  Papers (1)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (828 KB)

    Adaptive vector quantisation is used in image sequence coding where the code-book is updated continuously to keep track with the changing source statistics. Hence, for real-time video coding applications, both the processes of quantising the input vectors and updating the codebook are required to be fast. Since the nearest codeword search is involved in both these processes, a fast codeword search... View full abstract»

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