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IEE Proceedings - Vision, Image and Signal Processing

Issue 6 • Date Dec 1994

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Displaying Results 1 - 14 of 14
  • Colour texture analysis using colour histogram

    Publication Year: 1994, Page(s):403 - 412
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (720 KB)

    The authors describe a new and systematic way of analysing colour texture. They propose to extract both spatial (i.e. texture) and spectral (i.e. colour) attributes separately from a colour image. This involves a parallel system of representation comprising two channels, one for texture representation and the other for colour description. The spatial attributes are gathered by the `local linear tr... View full abstract»

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  • Textured image segmentation by context enhanced clustering

    Publication Year: 1994, Page(s):413 - 421
    Cited by:  Papers (5)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (740 KB)

    An unsupervised textured image segmentation technique based on multidimensional feature vector clustering is described, where the features are the parameters of an autoregressive model, The benefits of incorporating spatial contextual information are demonstrated on both true cluster number estimation and actual image segmentation. A simple within-cluster distance is used for cluster validity anal... View full abstract»

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  • Generalised block-matching motion estimation using quad-tree structured spatial decomposition

    Publication Year: 1994, Page(s):446 - 452
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (524 KB)

    A generalised block-matching motion estimation with variable-size blocks is proposed. The location and size of each block are determined from a quad-tree spatial decomposition algorithm. Experimental results with head-and-shoulders test image sequences show that motion-compensated errors with this method have lower entropy than the conventional fixed or variable-size block-matching techniques. The... View full abstract»

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  • Nonlinear cepstral equalisation method for noisy speech recognition

    Publication Year: 1994, Page(s):397 - 402
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    The authors deal with the problem of automatic speech recognition in the presence of additive white noise. The effect of noise is modelled as an additive term to the power spectrum of the original clean speech. The cepstral coefficients of the noisy speech are then derived from this model. The reference cepstral vectors trained from clean speech are adapted to their appropriate noisy version to be... View full abstract»

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  • Top down structured parallelisation of embedded image processing applications

    Publication Year: 1994, Page(s):431 - 437
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (536 KB)

    The authors present a general system design method which is intended to support parallelisation of complete image processing applications using MIMD processors. The approach is based upon the utilisation of a generic system level parallel processor architecture, the `pipeline processor farm'(PPF), and is applicable to any embedded application with continuous input/output. The design method is illu... View full abstract»

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  • Frequency sampling method for designing 2-D FIR real-coefficient digital filters using Hermite interpolation

    Publication Year: 1994, Page(s):365 - 372
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (532 KB)

    A novel frequency-sampling method for designing 2-D real-coefficient FIR filters, given the values and slope estimates of the desired frequency response at each of the node points of a rectangular grid, is presented. Based on a new class of bivariate Hermite-type polynomials suitable for interpolating at complex conjugate points, and using Kronecker products, the original 2-D filter design problem... View full abstract»

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  • Use of multiple vector quantisation for semicontinuous-HMM speech recognition

    Publication Year: 1994, Page(s):391 - 396
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    Although the continuous hidden Markov model (CHMM) technique seems to be the most flexible and complete tool for speech modelling. It is not always used for the implementation of speech recognition systems because of several problems related to training and computational complexity. Thus, other simpler types of HMMs, such as discrete (DHMM) or semicontinuous (SCHMM) models, are commonly utilised w... View full abstract»

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  • Generalised approach to parallelising image sequence coding algorithms

    Publication Year: 1994, Page(s):438 - 445
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB)

    The author describes the parallelisation of three different versions of the CCITT H.261 encoder algorithm using a generalised parallel design methodology based upon pipelines of processor farms (PPFs). For each algorithm, a theoretical upper-bound scaling model was derived by analysing the execution time profile of the algorithm and its feedback structure. The performance predicted by the model wa... View full abstract»

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  • Nonlinear echo cancelling using look-up tables and Volterra systems

    Publication Year: 1994, Page(s):357 - 364
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (516 KB)

    Two classical approaches to nonlinear echo cancellation are to use look-up tables combined with FIR filters and Volterra systems; their practical interest is higher when adapted with LMS-type algorithms, because results are easily implementable and offer good tracking capabilities. A complete analysis of look-up-table-based schemes is presented, and a new one is introduced which offers near optima... View full abstract»

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  • Image sequence coding using quadtree-based block-matching motion compensation and classified vector quantisation

    Publication Year: 1994, Page(s):453 - 460
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (616 KB)

    The authors propose a new image sequence coding algorithm based on two crucial methods: quadtree segmentation and classified vector quantisation (CVQ). Overall coding rates are efficiently lowered by quadtree segmentation while visual quality is well preserved by a CVQ method. A moving-block extraction technique is employed to greatly improve the coding efficiency in the interframe coding mode. A ... View full abstract»

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  • 2D shape signature based on fractal measurements

    Publication Year: 1994, Page(s):422 - 430
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    The authors describe a novel scheme for 2D shape representation based on fractal geometry. The representation (or fractal signature) of the shape is an external scalar transform which contains information from a wide range of scales and is invariant under translation, rotation and scaling. The performance of the signature is evaluated in the presence of noise and occlusion. Use of the fractal sign... View full abstract»

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  • Adaptive allpass filtering for nonminimum-phase system identification

    Publication Year: 1994, Page(s):373 - 379
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (484 KB)

    Efficient algorithms for the recursive identification of nonminimum-phase systems using an adaptive allpass filter together with an adaptive transversal filter are introduced. Both the output and input sequences are assumed to be available, and the proposed technique basically uses a linear predictor at the output of the system to equalise its magnitude response and an allpass filter to match its ... View full abstract»

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  • Complex gradient and Hessian

    Publication Year: 1994, Page(s):380 - 383
    Cited by:  Papers (66)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (184 KB)

    The gradient and Hessian are often used in analytical and numerical function optimisation complex valued parameter estimation problems. In a number of signal processing applications the function is a real function of complex variables. Then the optimisation is usually carried out with respect to the real and imaginary part of these variables; therefore, the gradient and Hessian concerned are real.... View full abstract»

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  • Neural network-based F0 text-to-speech synthesiser for Mandarin

    Publication Year: 1994, Page(s):384 - 390
    Cited by:  Papers (2)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    A neural-network-based approach to synthesising F0 information for Mandarin text-to-speech is discussed. The basic idea is to use neural networks to model the relationship between linguistic features. Extracted from input text and parameters representing the pitch contour of syllables. Two MLPs are used to separately synthesise the mean and shape of pitch contour, using different linguistic featur... View full abstract»

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