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IEE Proceedings - Vision, Image and Signal Processing

Issue 4 • Date Aug 1999

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Displaying Results 1 - 8 of 8
  • Speckle filtering of SAR images based on adaptive windowing

    Publication Year: 1999, Page(s):191 - 197
    Cited by:  Papers (35)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (496 KB)

    Speckle noise usually occurs in synthetic aperture radar (SAR) images owing to coherent processing of SAR data. The most well-known image domain speckle filters are the adaptive filters using local statistics such as the mean and standard deviation. The local statistics filters adapt the filter coefficients based on data within a fixed running window. In these schemes, depending on the window size... View full abstract»

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  • Affine-structure-based facial image encoding

    Publication Year: 1999, Page(s):211 - 221
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1032 KB)

    A real-time algorithm for affine-structure-based video compression for facial images is presented. The face undergoing motion is segmented and triangulated to yield a set of control points. The set of control points generated by triangulation are tracked across a few frames using an intensity-based correlation technique. For accurate motion and structure estimation a Kalman-filter-based algorithm ... View full abstract»

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  • New design of full band differentiators based on Taylor series

    Publication Year: 1999, Page(s):185 - 189
    Cited by:  Papers (24)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    The classical central difference approximations of the derivative of a function based on Taylor series are the same as type III maximally linear digital differentiators for low frequencies. A new finite difference formula is derived which can be implemented as a full band type IV maximally linear differentiator. The differentiator is compared with type III maximally linear and type IV equiripple m... View full abstract»

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  • Wavelet image coding based on significance extraction using morphological operations

    Publication Year: 1999, Page(s):206 - 210
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    An algorithm is proposed for improving Servetto et al.'s (see Proceedings of the International Conference on Image Processing, Washington, DC, p.530-3, 1995) method of morphological representation of wavelet data (MRWD), which is among the most efficient wavelet-based image compression algorithms. In MRWD, morphological dilation is used to capture and encode the arbitrarily shaped clusters of sign... View full abstract»

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  • Least mean squares algorithm for fractionally spaced blind channel estimation

    Publication Year: 1999, Page(s):181 - 184
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    The authors consider the problem of blind estimation and equalisation of digital communication finite impulse response (FIR) channels using fractionally spaced samples. The system input is assumed to be a deterministic but unknown data sequence. Exploiting the periodicity of the transmitted data sequence in the frequency domain in the noise free case, it is shown that it is possible to form a line... View full abstract»

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  • Histogram-based rate-distortion estimation for MPEG-2 video

    Publication Year: 1999, Page(s):198 - 205
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    A rate-distortion estimation method for MPEG-2 video that enables one to predict the number of bits and the distortion to be generated from an encoded picture at a given quantisation step size, and vice versa is proposed. The estimation method has some outstanding advantages: first, the computational complexity is small because its major operation is just to obtain a histogram or weighted histogra... View full abstract»

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  • Algorithm for hierarchical vector quantisation of video data

    Publication Year: 1999, Page(s):222 - 228
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (532 KB)

    A recursive algorithm is presented that is designed to construct quantisation tables and codebooks for the hierarchical vector quantisation of images. The algorithm is computationally inexpensive and yields high quality codebooks View full abstract»

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  • Hybrid LMS-LMF algorithm for adaptive echo cancellation

    Publication Year: 1999, Page(s):173 - 180
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    The coefficients of an echo canceller with a near-end section and a far-end section are usually updated with the same updating scheme, such as the LMS algorithm. A novel scheme is proposed for echo cancellation that is based on the minimisation of two different cost functions, i.e. one for the near-end section and a different one for the far-end section. The approach considered leads to a substant... View full abstract»

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