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IEE Proceedings - Vision, Image and Signal Processing

Issue 2 • Apr 1994

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Displaying Results 1 - 8 of 8
  • Novel efficient approach for the design of equiripple quadrature mirror filters

    Publication Year: 1994, Page(s):95 - 100
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    Quadrature mirror filters have been used extensively in subband coding of speech signals. The authors introduce a novel efficient approach for the design of equiripple quadrature mirror filters. The new approach is more efficient than the previously proposed design method in terms of computer time and memory requirement View full abstract»

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  • Structure of round-off noise in single-bit second-order sigma-delta modulators with zero input

    Publication Year: 1994, Page(s):107 - 113
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    Single-bit sigma-delta modulators are used for A-D conversion in a wide variety of systems. Analysis of first-order systems has made much progress, but the analysis of second-order systems is conventionally based on an approximate white-noise model of round-off noise. The present paper applies a new method of analysing second-order systems. It shows that, with zero input, the behaviour for each sa... View full abstract»

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  • Visual gesture recognition

    Publication Year: 1994, Page(s):101 - 106
    Cited by:  Papers (59)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    Presents a method for recognising human-hand gestures using a model based approach. A finite state machine is used to model four qualitatively distinct phases of a generic gesture. Fingertips are tracked in multiple frames to compute motion trajectories. The trajectories are then used for finding the start and stop position of the gesture. Gestures are represented as a list of vectors and are then... View full abstract»

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  • Radix-2 FFT-pipeline architecture with reduced noise-to-signal ratio

    Publication Year: 1994, Page(s):81 - 86
    Cited by:  Papers (8)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    A radix-2 FFT-pipeline architecture has been developed which exhibits a two- to three-bit increase in accuracy for transform lengths N greater than 210 if fixed-point arithmetic is utilised. The algorithm in use is a unification of the Cooley-Tukey radix-4 and radix-4+2 decompositions View full abstract»

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  • Estimation of general 2D motion using Fourier descriptors

    Publication Year: 1994, Page(s):115 - 121
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (972 KB)

    A feature based motion estimation and compensation scheme using Fourier descriptors is introduced, which is able to estimate and compensate not only translation but also scaling and rotation. The concept of combined motion compensation is also proposed to incorporate intensity based algorithms such as block-matching to realise much better performance. A new contour tracing method has been develope... View full abstract»

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  • Testing for the convergence of a linear decision directed equaliser

    Publication Year: 1994, Page(s):129 - 136
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (496 KB)

    Adaptation algorithms for blind equalisation of communication channels suffer from the presence of local equilibria that may cause convergence to incorrect equaliser parameter settings. In this paper we consider an infinite impulse response (IIR) channel which is to be equalised by a linear transversal filter and a slicer connected in tandem, and use the correlation statistics of the sequence at t... View full abstract»

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  • Fingerprint enhancement by directional Fourier filtering

    Publication Year: 1994, Page(s):87 - 94
    Cited by:  Papers (94)  |  Patents (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (832 KB)

    A new method of enhancing fingerprint images is described, based upon nonstationary directional Fourier domain filtering. Fingerprints are first smoothed using a directional filter whose orientation is everywhere matched to the local ridge orientation. Thresholding then yields the enhanced image. Various simplifications lead to efficient implementation on general-purpose digital computers. Results... View full abstract»

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  • Variable digital filter design using the outer product expansion

    Publication Year: 1994, Page(s):123 - 128
    Cited by:  Papers (28)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (348 KB)

    Digital filters with adjustable frequency domain characteristics are referred to as variable digital filters. Variable filters are useful in the applications where the filter characteristics are required to be changeable during the course of signal processing. Especially in real time applications, variable filters are needed to change their coefficients instantaneously such that the real time sign... View full abstract»

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