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IEE Proceedings - Vision, Image and Signal Processing

Issue 3 • Date Jun 1996

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Displaying Results 1 - 9 of 9
  • Morphological operations on crack coded binary images

    Publication Year: 1996, Page(s):171 - 176
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (480 KB)

    The author describes how morphological operations using a square structuring element may be performed on a binary image by processing the crack code descriptions of the outlines. The operations of erosion, dilation, thinning, and fattening are described View full abstract»

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  • Low bit-rate video coding with spatio-temporal geometric transforms

    Publication Year: 1996, Page(s):164 - 170
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1396 KB)

    A low bit-rate video coding technique that uses spatio-temporal geometric transforms is presented. Motion compensation based on the bilinear transform is employed to reduce the temporal redundancy of the video. The spatial redundancy of the motion compensated error images is reduced by a combination of fractals and the DCT. It is shown that in the objects boundaries of the motion compensated error... View full abstract»

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  • Outlier removal and discontinuity preserving smoothing of range data

    Publication Year: 1996, Page(s):191 - 200
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1212 KB)

    Algorithms for the segmentation and description of range images are very sensitive to errors in the source data caused processes in the optoelectronic sensing, and outliers caused by incorrect signal detection, for example false peaks in an active laser triangulation system. The authors present an approach to range data processing designed to reconstruct the underlying shape of the surfaces in the... View full abstract»

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  • Block classification for an adaptive 1-D/2-D DCT video coding

    Publication Year: 1996, Page(s):155 - 163
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1996 KB)

    A classification scheme for an adaptive one- or two-dimensional discrete cosine transform (1-D/2-D DCT) technique is described and demonstrated to be a more appropriate strategy than the conventional 2-D DCT for coding motion compensated prediction error images. Two block-based classification methods are introduced and their accuracy in predicting the correct transform type discussed. The accuracy... View full abstract»

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  • Genetic algorithm implementation of stack filter design for image restoration

    Publication Year: 1996, Page(s):177 - 183
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (852 KB)

    Stack filters are a class of nonlinear spatial operators used for noise suppression. Their design is formulated as an optimisation problem and genetic algorithms (GAs) are used to perform the configuration. Applying the mean absolute error (MAE) as the basis of an objective function, the stack filter is used to restore magnetic resonance (MR) images corrupted with uncorrelated additive noise from ... View full abstract»

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  • Design of some 2-D filters through the transformation technique

    Publication Year: 1996, Page(s):184 - 190
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1588 KB)

    The transformation technique is a powerful tool for designing 2-D FIR filters. However, it is not useful for the design of specially shaped filters with passband/stopband regions not centred around the origin. The authors extend this technique to design two types of filters. A notch filter has a stopband centred about a small region in the 2-D frequency plane. The authors propose an extension to t... View full abstract»

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  • Convergence and steady-state properties of the least-mean mixed-norm (LMMN) adaptive algorithm

    Publication Year: 1996, Page(s):137 - 142
    Cited by:  Papers (24)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    Convergence and steady-state analyses of a least-mean mixed-norm adaptive algorithm are presented. This is formed as a convex mixture of the mean-square and the mean-fourth cost functions. The local exponential stability of the algorithm is shown by application of the deterministic averaging analysis and the total stability theorem. A theoretical misadjustment expression is then obtained by using ... View full abstract»

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  • Source combined linear predictive analysis in pulse-based speech coders

    Publication Year: 1996, Page(s):143 - 148
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (480 KB)

    The conventional linear predictive analysis in pulse-based coders is replaced by the so-called source-combined linear predictive method to match the excitations considered in two steps: synthesis filter determination and excitation search. It differs from Atal's (1982) two-pass approach in that the synthesis filter is optimised jointly with the excitation prior to the analysis-by-synthesis (ABS) e... View full abstract»

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  • Artificial neural networks for nonlinear time-domain filtering of speech

    Publication Year: 1996, Page(s):149 - 154
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (500 KB)

    A multilayer perceptron (MLP) is applied as a time domain nonlinear filter to two classes of degraded speech, namely Gaussian white noise and nonlinear system degradation introduced by a low bit-rate CELP coder. The goal of the study is to examine the influence of the inherent nonlinearity within the MLP, and this is achieved by varying the levels of nonlinearity within the structure. Direct compa... View full abstract»

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