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IEE Proceedings - Vision, Image and Signal Processing

Issue 1 • Date Feb 2002

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Displaying Results 1 - 7 of 7
  • Psychophysically derived quantisation model for efficient DWT image coding

    Publication Year: 2002, Page(s):51 - 56
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (687 KB)

    An efficient method for the optimum quantisation of the luminance and chrominance components for discrete wavelet transform (DWT) still image coding, based on current psychophysical evidence, is described. Its practical application to image compression is presented. This new approach is further supported by experimental work which compares perceived DWT image quality with conventional JPEG-encodin... View full abstract»

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  • Robust authentication scheme for protecting copyrights of images and graphics

    Publication Year: 2002, Page(s):43 - 50
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1290 KB)

    Watermarking techniques are primarily used for copyright protection. A simple and robust watermark-like digital authentication scheme is proposed. This work has two major merits. First, the watermark used in the proposed authentication scheme is the same type used in the original image, e.g. grey level images. Second, the proposed scheme meets the requirements for watermarking techniques. Illegal ... View full abstract»

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  • Bayesian multivariate autoregressive models with structured priors

    Publication Year: 2002, Page(s):33 - 41
    Cited by:  Papers (8)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1290 KB)

    A variational Bayesian (VB) learning algorithm for parameter estimation and model-order selection in multivariate autoregressive (MAR) models is described. The use of structured priors in which subsets of coefficients are grouped together and constrained to be of a similar magnitude is explored. This allows MAR models to be more readily applied to high-dimensional data and to data with greater tem... View full abstract»

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  • Design and implementation of a fast algorithm for modulated lapped transform

    Publication Year: 2002, Page(s):27 - 32
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (569 KB)

    A new fast algorithm for the computation of the modulated lapped transform (MLT) is proposed and its efficient implementation using pipelining techniques and complex programmable logic device (CPLD) is presented. The new algorithm computes a length-M MLT via the length-M/2 fast Fourier transform (FFT). Computational overhead due to data shuffling in pre-processing and post-processing is offset in ... View full abstract»

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  • Alternating fixed-point algorithm for stereophonic acoustic echo cancellation

    Publication Year: 2002, Page(s):1 - 9
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (817 KB)

    A novel algorithm for use in stereophonic acoustic echo cancellation is introduced. The alternating fixed-point structure of the algorithm descends each of the channels alternatively and avoids nonuniqueness in the solutions by employing inter- and intra-channel orthogonal projections. For a noisy environment, the algorithm is shown to provide improved misalignment performance and echo cancellatio... View full abstract»

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  • Candidate scheme for fast ACELP search

    Publication Year: 2002, Page(s):10 - 16
    Cited by:  Papers (6)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (745 KB)

    The algebraic code excited linear prediction (ACELP) algorithm has been adopted by many speech coding standards, due to low complexity and high quality in its analysis-by-synthesis optimisation. For further computational complexity reduction, the authors propose a fast ACELP algorithm using a designed pilot function to predict the predetermined candidate pulses. With candidate pulses, it is possib... View full abstract»

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  • Robust microphone arrays using subband adaptive filters

    Publication Year: 2002, Page(s):17 - 25
    Cited by:  Papers (13)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (874 KB)

    A new adaptive beamformer which combines the idea of subband processing and the generalised sidelobe canceller structure is presented. The proposed subband beamformer has a blocking matrix that uses coefficient-constrained subband adaptive filters to limit target cancellation within an allowable range of direction of arrival. Simulations comparing the fullband and subband adaptive beamformers show... View full abstract»

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