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Vision, Image and Signal Processing, IEE Proceedings -

Issue 1 • Date Feb 1997

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Displaying Results 1 - 7 of 7
  • Index-compressed vector quantisation based on index mapping

    Publication Year: 1997 , Page(s): 31 - 38
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (692 KB)  

    The authors introduce a novel coding technique which significantly improves the performance of the traditional vector quantisation (VQ) schemes at low bit rates. High interblock correlation in natural images results in a high probability that neighbouring image blocks are mapped to small subsets of the VQ codebook, which contains highly correlated codevectors. If, instead of the whole VQ codebook,... View full abstract»

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  • Generalised approach to the recognition of structurally similar handwritten characters using multiple expert classifiers

    Publication Year: 1997 , Page(s): 15 - 22
    Cited by:  Papers (9)  |  Patents (2)
    Click to expandAbstract | PDF file iconPDF (848 KB)  

    It is observed that a particular classifier using a particular set of features will generally exhibit a greater probability of confusion among certain character classes than among others. In general these confusion classes are a substantial source of error in the overall performance of the classifier. A productive way to deal with the problem is to separate these characters and reprocess them furt... View full abstract»

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  • Estimation of autoregressive signals from noisy measurements

    Publication Year: 1997 , Page(s): 39 - 45
    Click to expandAbstract | PDF file iconPDF (676 KB)  

    The paper presents an asymptotically unbiased estimator of autoregressive parameters from noisy observations. The key ingredient in the author's method is that a new and simple scheme for estimation of the variance of the white measurement noise is developed. This estimated variance is then used in conjunction with the known technique for elimination of the least-squares estimation bias when the n... View full abstract»

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  • Numerically stable algorithm for computing Wigner-Ville distribution

    Publication Year: 1997 , Page(s): 46 - 48
    Click to expandAbstract | PDF file iconPDF (308 KB)  

    The Wigner-Ville distribution (WVD) is a particularly useful technique for analysing nonstationary signals and has been studied extensively. An algorithm has been proposed for computing the WVD requiring only real operations, but involving division by sine and cosine factors. However, this causes numerical instabilities because of roundoff errors in finite length registers. The authors present a f... View full abstract»

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  • Fast conditioning algorithm for significant zero curvature detection

    Publication Year: 1997 , Page(s): 23 - 30
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (836 KB)  

    Zero curvature points are commonly used as features in machine vision. Traditional approaches to zero curvature detection rely heavily on discrete curvature estimation done in scale-space, which is costly to compute. The authors report their work on achieving a quick approximation by using conditioning. The algorithm is efficient and the zero curvature points detected are stable across scales. Usu... View full abstract»

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  • Stability of multichannel sound control systems

    Publication Year: 1997 , Page(s): 1 - 7
    Cited by:  Papers (1)
    Click to expandAbstract | PDF file iconPDF (700 KB)  

    Sufficient conditions for the stability of decentralised, as well as fully coupled, active multichannel harmonic sound systems are derived. Such systems are being increasingly used to attenuate undesirable noise from harmonic (or narrowband) sources, at specific locations. These conditions are based on generalisations of the Gershgorin theorem. The advantage of using these generalisations is that ... View full abstract»

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  • Optimal polygonal approximation of digitised curves

    Publication Year: 1997 , Page(s): 8 - 14
    Cited by:  Papers (3)  |  Patents (1)
    Click to expandAbstract | PDF file iconPDF (828 KB)  

    Piecewise linear approximation of thinned digitised curves is a popular technique when a large number of discrete points has to be represented in a compact way for shape analysis and pattern classification. Such representations reduce significantly the storage-memory space and facilitate the extraction of numerical features from waveform curves or images. Polygonal curve fitting involves approxima... View full abstract»

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