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Vision, Image and Signal Processing, IEE Proceedings -

Issue 3 • Date 1 June 2004

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Displaying Results 1 - 12 of 12
  • Quasi-equiripple approximation of minimum phase FIR filters by updating desired response

    Publication Year: 2004, Page(s):164 - 169
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (269 KB)

    The authors present a numerical method for the Chebyshev approximation of minimum phase FIR digital filters. This method is based on solving a least squares (LS) problem iteratively. At each iteration, the desired response is transformed so as to have an equiripple magnitude error. This method makes it possible to design minimum phase FIR filters whose magnitude error is quasi-equiripple. Using th... View full abstract»

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  • Real-time traffic parameter extraction using entropy

    Publication Year: 2004, Page(s):194 - 202
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (564 KB)

    A vision-based traffic monitoring system that can perform real-time traffic parameter extraction is proposed. The entropy measurement, which is commonly adopted as an important feature to describe the degree of disorder in thermodynamics, is used as an underlying feature in this work. Based on an entropy measurement, a number of important traffic parameters, such as traffic flow, space mean speed ... View full abstract»

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  • Hidden Markov Bayesian texture segmentation using complex wavelet transform

    Publication Year: 2004, Page(s):215 - 223
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1343 KB)

    The authors propose a multiscale Bayesian texture segmentation algorithm that is based on a complex wavelet domain hidden Markov tree (HMT) model and a hybrid label tree (HLT) model. The HMT model is used to characterise the statistics of the magnitudes of complex wavelet coefficients. The HLT model is used to fuse the interscale and intrascale context information. In the HLT, the interscale infor... View full abstract»

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  • Simple and practical cyclostationary beamforming algorithms

    Publication Year: 2004, Page(s):175 - 179
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (282 KB)

    Inspired by the asymmetric principal component analysis (APCA) neural model and based on the signal cyclostationarity, the authors propose a simple gradient-descent beamforming (GDB) algorithm. The GDB algorithm is an adaptive blind beamforming algorithm and can be used to extract signals with cyclostationarity under a complex signal environment. Although the GDB algorithm suffers from slow conver... View full abstract»

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  • Wavelet based robust sub-band features for phoneme recognition

    Publication Year: 2004, Page(s):187 - 193
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (630 KB)

    Wavelet transform has been found to be an effective tool for the time-frequency analysis of non-stationary and quasi-stationary signals. Recent years have seen wavelet transform being used for feature extraction in speech recognition applications. In the paper a sub-band feature extraction technique based on an admissible wavelet transform is proposed and the features are modified to make them rob... View full abstract»

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  • Inertial snake for contour detection in ultrasonography images

    Publication Year: 2004, Page(s):235 - 240
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (934 KB)

    Snakes, or active contour models are used extensively for image segmentation in varied fields. However, some major challenges restrict their use in many fields. The authors propose a new inertial snake model, that introduces an inertial effect of the control points into the snake framework. The proposed inertial force along with the first- and second-order continuity forces controls the spline mot... View full abstract»

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  • Flooding-based watershed algorithm and its prototype hardware architecture

    Publication Year: 2004, Page(s):224 - 234
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1069 KB)

    Watershed transformation is a powerful image segmentation technique. The potential of its real-time application can be realised by a dedicated hardware architecture. However, little work has been reported so far on hardware realisation of watershed transformation. The authors propose an improved watershed algorithm derived from Meyer's simulated flooding-based algorithm by ordered queues and a pro... View full abstract»

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  • Multi-resolution dyadic wavelet denoising approach for extraction of visual evoked potentials in the brain

    Publication Year: 2004, Page(s):180 - 186
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (329 KB)

    More powerful techniques need to be developed to extract small and weak visual evoked potentials (VEPs) from the spontaneous cerebral electric activity EEG. The authors present a wavelet decomposition algorithm suitable for identification and detection of very weak VEPs. The cross-correlation analysis between Daubechies wavelet (i.e. dbN) functions ψN(t), for N=4, 5 ,...,10 and a re... View full abstract»

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  • Robust transmit pulse design

    Publication Year: 2004, Page(s):170 - 174
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (326 KB)

    The problem of designing a transmit pulse such that after transmission over a dispersive channel the received pulse fits in a prescribed template can be formulated as a quadratic programming problem with affine semi-infinite constraints. In constrained optimisation, the optimal solution invariably lies on the boundary of the feasible set, and consequently perturbations on the optimal solution or t... View full abstract»

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  • Progressive decoding method for fractal image compression

    Publication Year: 2004, Page(s):207 - 213
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1007 KB)

    Fractal image compression is an efficient technique for compactly coding images, in which an image is encoded by a contractive transformation whose fixed point is close to the original image, and then is decoded by using an iteration procedure stemmed from the well known Banach fixed-point theorem. A new fixed-point iteration theorem with a control parameter is presented, which provides a novel it... View full abstract»

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  • Statistical modelling of the wavelet coefficients with different bases and decomposition levels

    Publication Year: 2004, Page(s):203 - 206
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (237 KB)

    Various wavelet coefficient statistics are useful to increase the compression efficiency of images. The distribution of the wavelet coefficients within a sub-band affects how the decompression values should be adjusted. A generalised Gaussian distribution model is seen to be applicable from a theoretical point of view, and a convenient way is provided to estimate the parameters from the empirical ... View full abstract»

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  • Generalised transform factorisation for massive parallelism

    Publication Year: 2004, Page(s):153 - 163
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (526 KB)

    A formalism and an algorithm for configuring and sequencing parallel to massively parallel processors for the application of generalised spectral analysis transforms are presented. Successive partial rotations of a base-p hypercube, where p is an arbitrary integer, are shown to produce dynamic contention-free memory allocation, in a generalised parallelism processor architecture. The approach is i... View full abstract»

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