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IEE Proceedings - Vision, Image and Signal Processing

Issue 5 • Oct 2002

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Displaying Results 1 - 8 of 8
  • Nonlinear filtering for phase image denoising

    Publication Year: 2002, Page(s):290 - 296
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (964 KB)

    The problem of phase image denoising through nonlinear (NL) filtering is addressed. There are various imaging systems in which the phase information is utilised to generate useful imaging data. However, the presence of noise makes difficult to obtain the appropriate phase image. The authors apply NL vector filtering techniques to denoise the complex data from which the phase image is extracted. A ... View full abstract»

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  • Fusion algorithm for multisensor images based on discrete multiwavelet transform

    Publication Year: 2002, Page(s):283 - 289
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1196 KB)

    The authors review the notion of multiwavelets and describe the use of the discrete multiwavelet transform (DMWT) in image fusion processing. Multiwavelets are extensions from scalar wavelets, and have several advantages in comparison with scalar wavelets. Multiwavelet analysis can offer more precise image analysis than wavelet multiresolution analysis. A novel fusion algorithm is presented for mu... View full abstract»

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  • Design of two-channel low-delay IIR nonuniform-division filter banks using L1 error criteria

    Publication Year: 2002, Page(s):304 - 314
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (850 KB)

    The design of a two-channel nonuniform-division filter (NDF) bank with infinite impulse response (IIR) analysis/synthesis filters and low group delay in the sense of L1 error criteria is considered. The problem formulation results in a nonlinear optimisation problem. Based on a variant of Karmarkar's algorithm, the optimisation problem is solved through a frequency sampling and iterativ... View full abstract»

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  • DC coefficient restoration technique and its application to image coding

    Publication Year: 2002, Page(s):272 - 282
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3242 KB)

    In the traditional approach of block transform image coding, a large number of bits are allocated to the DC coefficients. A technique called DC coefficient restoration (DCCR) has been proposed to further improve the compression ability of block transform image coding by not transmitting the DC coefficients but estimating them from the transmitted AC coefficients. Images thus generated, however, ha... View full abstract»

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  • Eigenfilter approach for the design of variable fractional delay FIR and all-pass filters

    Publication Year: 2002, Page(s):297 - 303
    Cited by:  Papers (16)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (677 KB)

    An eigenfilter approach is presented for designing 1-D and 2-D variable fractional delay FIR and all-pass filters. First, the coefficients of filters are expressed as a polynomial of the fractional delay parameter. Then, the optimal polynomial coefficients are obtained from the elements of the eigenvector corresponding to the minimum eigenvalue of a real, symmetric and positive definite matrix. Fi... View full abstract»

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  • Boundary filter design for multiwavelets

    Publication Year: 2002, Page(s):315 - 320
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (584 KB)

    When designing boundary filters for multiwavelets, perfect reconstruction and moment conditions are two of the most important criteria to be considered. Since the filter coefficients of multiwavelets are expressed in the form of matrices, the moment conditions for multiwavelets do not relate to the filter coefficients in a simple way as for scalar wavelets. The authors first formulate the moment c... View full abstract»

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  • General multilayer perceptron demixer scheme for nonlinear blind signal separation

    Publication Year: 2002, Page(s):253 - 262
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (896 KB)

    A new technique is presented for instantaneous blind signal separation from nonlinear mixtures using a general neural network based demixer scheme. The nonlinear demixer model follows directly from the general mixer model. A general mixer model is described which includes linear mixtures as a special case. In the second part the general framework for a demixer based on a feedforward multilayer per... View full abstract»

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  • Comparison of three rough surface classifiers

    Publication Year: 2002, Page(s):263 - 271
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2560 KB)

    Texture analysis techniques are used to segment rough surfaces into regions of homogeneous texture. The performance of three rough surface classifiers was assessed and compared. The classifiers differ in their discrimination as well as in their input and computational requirements. Simulation and experiment were used to identify the limitations of the classifiers and to identify which classifier i... View full abstract»

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