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IEE Proceedings - Vision, Image and Signal Processing

Issue 1 • Feb 1998

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Displaying Results 1 - 10 of 10
  • Parallelising a set of 2-D frequency transforms in a flexible manner

    Publication Year: 1998, Page(s):65 - 72
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (952 KB)

    The implementation of parallel two-dimensional frequency transforms intended for the acceleration of image-processing algorithms is described. The way these routines fit into a wider generic format for such parallel routines is also indicated. There is a brief consideration of the design decisions needed to combine the choice of efficient routine with wide utility. Due consideration is given to au... View full abstract»

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  • Classification of sets of mixed pixels with the hypothesis-testing Hough transform

    Publication Year: 1998, Page(s):57 - 64
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (816 KB)

    A new method is presented for mixed pixel classification where the classification of groups of mixed pixels is achieved by using the hypothesis-testing Hough transform. The motivation of the work is that some other estimation methods based on robust statistics, such as the standard Hough transform, have been criticised that, although they can cope with the presence of outliers, they give poor perf... View full abstract»

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  • Optimal segmentation of cell images

    Publication Year: 1998, Page(s):50 - 56
    Cited by:  Papers (12)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2248 KB)

    An optimal segmentation algorithm for light microscopic cell images is presented. The image segmentation is performed by thresholding a parametric image approximating the original image. Using the mean squared error between the original and the constructed image as the cost function, the segmentation problem is transformed into an optimisation process where parametric parameters are determined tha... View full abstract»

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  • Fuzzy soft mathematical morphology

    Publication Year: 1998, Page(s):41 - 49
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (920 KB)

    A new framework which extends the concepts of soft mathematical morphology into fuzzy sets is presented. Images can be considered as arrays of fuzzy singletons on the Cartesian grid. Based on this notion the definitions for the basic fuzzy soft morphological operations are derived. Compatibility with binary soft mathematical morphology as well as the algebraic properties of fuzzy soft operations a... View full abstract»

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  • Tracking ill-conditioning for the RLS-lattice algorithms

    Publication Year: 1998, Page(s):1 - 5
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    The numerical performance of lattice-based adaptive signal processing algorithms is shown to involve the conditioning of a 2×2 matrix whose off-diagonal elements contain reflection coefficients. Degraded algorithmic performance for the a posteriori recursive least squares lattice (RLSL) is shown to be attributed to the ill-conditioning of this matrix, Theoretical results are given which may ... View full abstract»

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  • Design of IIR notch filters with different passband gains

    Publication Year: 1998, Page(s):6 - 10
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB)

    A method is proposed for the design of infinite-duration impulse response (IIR) notch filters with different passband gains using the standard lowpass IIR digital-filter design methods. This method satisfies the notch-frequency specification exactly and realises a rejection bandwidth, defined by the frequencies at which the gain is 3 dB below the lower of the two passband gains, which is smaller t... View full abstract»

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  • Reduction of loudspeaker polar response aberrations through the application of psychoacoustic error concealment

    Publication Year: 1998, Page(s):11 - 18
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (768 KB)

    In a loudspeaker system it is important to have a well controlled polar response: however, with conventional multidriver enclosures off-axis phase cancellation will occur at and around the crossover frequency. To generate a uniform polar radiation pattern from any given imperfect loudspeaker cabinet, it is necessary to reduce the perceived off-axis phase cancellation due to the crossover filters. ... View full abstract»

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  • Robust LPC parameter estimation in standard CELP 4800 bit/s speech coder

    Publication Year: 1998, Page(s):19 - 22
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    In order to decrease LPC spectral degradation in the USA FED STD 1016 4.8 kbit/s CELP speech coder, application of a robust LPC parameter estimation is proposed. Robust LPC methods, based on Huber's M-estimation theory and a heuristic sample-selective two-stage robust procedure, are considered. Comparative experimental analysis is carried out based on the cepstral distance, as an objective spectra... View full abstract»

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  • Estimating time-varying noise introduced by CVSD for speech enhancement

    Publication Year: 1998, Page(s):23 - 29
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (760 KB)

    The authors examine the possibility of improving the quality of speech obtained with continuously variable slope delta-modulation (CVSD), a speech coding method that has been quite widely employed in mobile radios. CVSD is well-known for its robustness and implementation simplicity, but the quality of the resultant speech (commonly at 16 kbps) is often not very satisfactory. Through their study, t... View full abstract»

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  • Two pixel-preselection methods for median-type filtering

    Publication Year: 1998, Page(s):30 - 40
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3248 KB)

    Most of the median-type filters designed to remove impulsive noise process all the pixels in the noisy image. A certain number of non-noisy pixels are thus unexpectedly modified, thereby limiting the quality of the result. Since these pixels need not, and should not, be filtered, the authors propose two approaches for selecting the pixels to be processed. The first of these operates online, by rel... View full abstract»

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