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IEE Proceedings - Vision, Image and Signal Processing

Issue 2 • Date Apr 2000

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Displaying Results 1 - 13 of 13
  • Reconstruction from 2-D wavelet transform modulus maxima using projection

    Publication Year: 2000, Page(s):176 - 184
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (896 KB)

    Wavelet transform modulus maxima can be used to characterise sharp variations such as edges and contours in an image. The authors analyse the a priori constraints present in the wavelet transform modulus maxima representation. A new projection-based algorithm which enforces all the a prior constraints in the representation is proposed. Quadratic programming is used to obtain a sequence which satis... View full abstract»

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  • Image sequence stabilisation based on DFT filtering

    Publication Year: 2000, Page(s):95 - 102
    Cited by:  Papers (28)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1008 KB)

    An image sequence stabilisation system based on DFT filtering of absolute frame displacements to compensate for undesired fluctuations in the sequence by shifting image frames into correct positions is reported. The system compensates for undesired jitter, while preserving desired global camera motions. Robustness is introduced to interframe motion estimation by averaging motion vectors detected i... View full abstract»

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  • Recurrent neural network speech predictor based on dynamical systems approach

    Publication Year: 2000, Page(s):149 - 156
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (576 KB)

    A nonlinear predictive model of speech, based on the method of time delay reconstruction, is presented and approximated using a fully connected recurrent neural network (RNN) followed by a linear combiner. This novel combination of the well established approaches for speech analysis and synthesis is compared with traditional techniques within a unified framework to illustrate the advantages of usi... View full abstract»

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  • Design of doubly complementary filters with approximate linear phase

    Publication Year: 2000, Page(s):103 - 108
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    A new procedure for the design of a real doubly complementary (DC) pair of digital filters obtained from an all-pass structure is presented. The filter design is based on a zero-phase FIR filter design with multi-band frequency specifications and approximate linear-phase characteristic. The resulting complex or real all-pass filter structure is guaranteed to be stable. Some examples illustrating t... View full abstract»

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  • Fuzzy image clustering incorporating spatial continuity

    Publication Year: 2000, Page(s):185 - 192
    Cited by:  Papers (44)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (772 KB)

    The authors present a spatial fuzzy clustering algorithm that exploits the spatial contextual information in image data. The objective functional of their method utilises a new dissimilarity index that takes into account the influence of the neighbouring pixels on the centre pixel in a 3×1 window. The algorithm is adaptive to the image content in the sense that influence from the neighbourin... View full abstract»

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  • Fixed-point error analysis of two DCT algorithms

    Publication Year: 2000, Page(s):131 - 137
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    A fixed-point error analysis of two fast DCT algorithms proposed by Hou (1987) and Makhoul (1980) is presented. Expressions for error variances are derived and the results are compared with the simulation results. It is found that the simulation results and analysis results agree quite closely. This demonstrates the validity of the analysis. In addition, the two algorithms are compared in terms of... View full abstract»

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  • Colour image filters based on hypercomplex convolution

    Publication Year: 2000, Page(s):89 - 93
    Cited by:  Papers (24)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB)

    There are very few examples of true vector filters known for colour images. The authors introduce a new class of filter based on convolution with hypercomplex masks, and present three colour edge detecting filters inspired by the Prewitt, Sobel and Kirsch filters. These filters, when applied to a colour image, produce an almost greyscale image with colour edges where the original image had a sharp... View full abstract»

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  • Higher order statistics based IIR notch filtering scheme for enhancing sinusoids in coloured noise

    Publication Year: 2000, Page(s):115 - 121
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    It is known that sinusoids generate lines in their spectra, but false lines may appear when the sinusoids are corrupted by coloured additive noise. In the paper, a higher-order statistics-based IIR filtering scheme is suggested to suppress additive coloured noise, thus enhancing the desired spectral peaks due to the sinusoids. The filter used is an unknown pole-zero constrained IIR notch filter. T... View full abstract»

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  • Aerial inspection of overhead power lines using video: estimation of image blurring due to vehicle and camera motion

    Publication Year: 2000, Page(s):157 - 166
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1744 KB)

    One of the principal difficulties of video inspection of overhead power distribution lines from a helicopter is the blurring of the image due to rotation of the camera in its gimbals and the translational motion of the helicopter. The author presents a kinematic model describing the sightline geometry which includes the effect of the helicopter's rectilinear motion in three degrees of freedom. It ... View full abstract»

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  • Analytical design of 3-D wavelet filter banks using the multivariate Bernstein polynomial

    Publication Year: 2000, Page(s):122 - 130
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (832 KB)

    The design of 3-D multirate filter banks where the downsampling/upsampling is on the FCO (face centred orthorhombic) lattice is addressed. With such a sampling lattice, the ideal 3-D sub-band of the low-pass filter is of the TRO (truncated octahedron) shape. The transformation of variables has been shown previously to be an effective technique for designing M-D (multidimensional) filter banks. A d... View full abstract»

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  • Efficient hierarchical chaotic image encryption algorithm and its VLSI realisation

    Publication Year: 2000, Page(s):167 - 175
    Cited by:  Papers (10)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1428 KB)

    An efficient hierarchical chaotic image encryption algorithm and its VLSI architecture are proposed. Based on a chaotic system and a permutation scheme, all the partitions of the original image are rearranged and the pixels in each partition are scrambled. Its properties of high security, parallel and pipeline processing, and no distortion are analysed. To implement the algorithm, its VLSI archite... View full abstract»

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  • Efficient implementation of the Volterra filter

    Publication Year: 2000, Page(s):109 - 114
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    An efficient implementation of the Volterra filter is presented which uses a frequency domain representation to reduce the number of computations. The multidimensional convolution of the Volterra filter is transformed to the frequency domain giving a transformed input matrix which is sparse and obtained directly from a one-dimensional Fourier transform, in addition to the sparse nature of the tran... View full abstract»

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  • Order-recursive blind identification of linear models using mixed cumulants

    Publication Year: 2000, Page(s):139 - 148
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (648 KB)

    The problem of determining the AR order and parameters of a nonminimum phase ARMA model from observations of the system output is considered. The model is driven by a sequence of random variables which is assumed unobservable. A novel identification algorithm based on the second- and third-order cumulants of the output sequences is introduced. It performs order-recursively by minimising a well def... View full abstract»

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