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IEE Proceedings - Vision, Image and Signal Processing

Issue 1 • Date Feb 1995

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Displaying Results 1 - 11 of 11
  • Texture classification using a spatial-point process model

    Publication Year: 1995, Page(s):1 - 6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (580 KB)

    A Bayesian statistical classifier for the segmentation of texture is presented, which models the quantised image data as a set of independent spatial Poisson processes. Two data sets are examined, namely Gaussian white noise textures, and textures contained in a sidescan sonar image of the seabed. The Poisson model is demonstrated to be applicable in both these cases, and a maximum likelihood disc... View full abstract»

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  • Unusual-length number-theoretic transforms using recursive extensions of Rader's algorithm

    Publication Year: 1995, Page(s):31 - 34
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    A novel decomposition of NTT block-lengths is proposed using repeated applications of Rader's (1968) algorithm to reduce the problem to that of realising a single small-length NTT. An efficient implementation of this small-length NTT is achieved by an initial basis conversion of the data, so that the new basis corresponds to the kernel of the small-length NTT. Multiplication by powers of the kerne... View full abstract»

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  • Image segmentation for compression of images and image sequences

    Publication Year: 1995, Page(s):15 - 21
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (524 KB)

    Region-based image coding schemes, the so-called second generation techniques, have gained much favour in recent years. For still picture coding, they can increase the compression ratio obtained by transform coding by an order of magnitude, while maintaining adequate image representation. The success of these techniques relies on the ability to describe regions in an image succinctly by their shap... View full abstract»

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  • Isolated Mandarin syllable recognition using segmental features

    Publication Year: 1995, Page(s):59 - 64
    Cited by:  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    A segment-based speech recognition scheme is proposed. The basic idea is to model explicitly the correlation among successive frames of speech signals by using features representing contours of spectral parameters. The speech signal of an utterance is regarded as a template formed by directly concatenating a sequence of acoustic segments. Each constituent acoustic segment is of variable length in ... View full abstract»

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  • Parallel-decomposition algorithm for discrete computational problems and its application in developing an efficient discrete convolution algorithm

    Publication Year: 1995, Page(s):40 - 46
    Cited by:  Papers (2)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (372 KB)

    The authors present a parallel-decomposition algorithm for discrete computational problems. An efficient convolution algorithm is developed under the proposed decomposition algorithm. The decomposition operation is based on integer modular arithmetic. Congruent sets are generated from integer modular operation over the index of the problem and constitute a partition. The partition is used to decom... View full abstract»

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  • New separable transform

    Publication Year: 1995, Page(s):27 - 30
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    A separable version in two dimensions of the transform previously presented by Boussakta and Holt (1992) is introduced and generalised to the multi-dimensional case. This transform is fast and symmetric, has the convolution property and is separable, making if a good candidate for the calculation of two-dimensional convolutions and correlations for image processing purposes View full abstract»

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  • Fast computation of the two-dimensional generalised Hartley transforms

    Publication Year: 1995, Page(s):35 - 39
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB)

    The two-dimensional generalised Hartley transforms (2-D GDHTs) are various half-sample generalised DHTs, and are used for computing the 2-D DHT and 2-D convolutions. Fast computation of 2-D GDHTs is achieved by solving (n1+(n01/2))k1+(n2+(n02 /2))k2=(n+(½))k mod N, n01, n02 =1 or 0. The kernel indexes on... View full abstract»

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  • Modelling of acoustic transfer functions for echo cancellers

    Publication Year: 1995, Page(s):47 - 51
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (360 KB)

    ARMA modelling (infinite impulse response filters having both poles and zeros), rather than MA modelling, of acoustic transfer functions is potentially capable of reducing the number of coefficients required to achieve a given level of echo cancellation. The amount of reduction obtainable, however, has received little attention in the literature. To arrive at quantitative figures for the complexit... View full abstract»

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  • Development of simple orthogonal transforms for image compression

    Publication Year: 1995, Page(s):22 - 26
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    A new family of orthogonal transform called dyadic transform (DT) is proposed for image compression by using the principle of dyadic symmetry. Two order-8 DTs are generated and their implementation is very simple in that it only requires operations of addition and binary shift. Performance evaluations using a statistical model and real images show that the performance of the proposed transforms is... View full abstract»

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  • Hierarchical line extraction

    Publication Year: 1995, Page(s):7 - 14
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (476 KB)

    A hierarchical line and segment extraction algorithm, based on a pyramid, is described. Initially, lines are detected in small windows using the Hough transform. The detected lines are then merged using a distance criteria thus avoiding a reaccumulation process at each level of the pyramid. The hierarchical merging process is efficiently performed on lines rather than on segments (since there are ... View full abstract»

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  • Dynamic partial search scheme for stochastic codebook of FS1016 CELP coder

    Publication Year: 1995, Page(s):52 - 58
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    The authors present a new classified dynamic partial search structure for the stochastic codebook of the FS1016 CELP coder to replace the fixed partial search for selecting the best excitation vector of the stochastic codebook. In the proposed scheme, the conventional one-stage stochastic codebook search is substituted with a two-stage dynamic method for reducing the computational complexity witho... View full abstract»

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