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IEE Proceedings - Vision, Image and Signal Processing

Issue 5 • Date 30 Oct. 2004

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Displaying Results 1 - 13 of 13
  • Generalised candidate scheme for the stochastic codebook search of scalable CELP coders

    Publication Year: 2004, Page(s):443 - 452
    Cited by:  Papers (3)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (397 KB)

    MPEG-4 CELP speech coders configured with multiple bit rates and coding layers provide SNR scalability, and hence may be operated effectively in variable bandwidth environments. A generalised candidate (GC) scheme is proposed to reduce the computational complexity of the stochastic codebook search of CELP coders. The experimental results demonstrate that the proposed GC scheme, incorporated with t... View full abstract»

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  • Convergence analysis of the adaptive lattice filter for a mixed Gaussian input sequence

    Publication Year: 2004, Page(s):428 - 433
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (290 KB)

    The convergence performance of the adaptive lattice filter (ALF) using the stochastic gradient algorithm is measured by the convergence speed and estimated error variance of the PARCOR coefficient. The convergence properties of the ALF are analysed when the filter input has a Gaussian mixture distribution. First, theoretical expressions for the convergence rate and asymptotic error variance of the... View full abstract»

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  • Restricted structure optimal linear estimators

    Publication Year: 2004, Page(s):400 - 410
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (654 KB)

    The restricted structure optimal deconvolution filtering, smoothing and prediction problem for multivariable, discrete-time linear signal processing problems is considered. A new class of discrete-time optimal linear estimators is introduced that directly minimises a minimum variance criterion but where the structure is prespecified to have a relatively simple form. The resulting estimator can be ... View full abstract»

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  • Efficient tree structured motion estimation using successive elimination

    Publication Year: 2004, Page(s):369 - 377
    Cited by:  Papers (8)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (558 KB)

    In H.264/AVC, tree structured motion estimation enhances the coding efficiency significantly while dramatically increasing the computational complexity of block matching. In the paper, a successive elimination algorithm (SEA) is implemented in tree structured motion estimation with a simple and effective method to determine the initial motion vector, which exploits the strong correlation among the... View full abstract»

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  • Perceptual shape VQ of spectral envelope for efficient representation of LPC residual

    Publication Year: 2004, Page(s):434 - 442
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (405 KB)

    The authors present an effective spectral envelope (SE) quantisation scheme for parametric speech coders, based on human hearing properties. The variable-dimension SE uniformly sampled vector in frequency is first converted into a fixed, but small, number of nonlinearly spaced frequency bands on the Bark scale. The minimum Bark spectral distortion (BSD) criterion is applied to enable the hearing-b... View full abstract»

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  • Phase regression approach for estimating the parameters of a noisy multifrequency signal

    Publication Year: 2004, Page(s):411 - 420
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (337 KB)

    A novel approach for estimating the parameters of a multifrequency signal from discrete samples corrupted by additive noise is presented. An established mathematical model indicates that noise influence on the discrete phase and amplitude spectra is equivalent to additive phase and amplitude noise, respectively. On this basis, a simple algorithm is proposed to estimate the frequency and phase of e... View full abstract»

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  • Compressing image-based relighting data using eigenanalysis and wavelets

    Publication Year: 2004, Page(s):378 - 388
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (832 KB)

    In image-based relighting (IBL) a tremendous number of reference images are needed to synthesise a high-quality novel image. This collection of reference images is referred as an IBL data set. An effective compression method for IBL data makes the IBL technique more practical. Within an IBL data set, there is a strong correlation among different reference images. In conventional eigen-based image ... View full abstract»

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  • Chick feather pattern recognition

    Publication Year: 2004, Page(s):337 - 344
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (834 KB)

    A crescent model is proposed for chick wing image processing and feather pattern recognition, thereby implementing chick sex separation by machine vision technology. The crescent shape delineates the region of interest in a wing image by an arc of large radius and an arc of small radius at two off-centred circles. Wing feathers are divergently distributed in the crescent region, manifesting as an ... View full abstract»

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  • Design and VLSI implementation of QMF banks

    Publication Year: 2004, Page(s):421 - 427
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (430 KB)

    The authors consider the design of multirate filterbanks for applications such as subband coding with IIR QMF (quadrature mirror filter) pairs. These offer reduced complexity and low latency at the expense of the loss of exact linear phase. In particular, consideration is given to the use of all-pass sections where linear phase is approximately achieved by being part of the objective in numerical ... View full abstract»

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  • Two-dimensional subband transforms: theory and applications

    Publication Year: 2004, Page(s):389 - 399
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (767 KB)

    The one-dimensional subband FFT (SB-FFT) and one-dimensional SB-DCT were extended to the two-dimensional (2-D) case to obtain the 2-D SB-FFT and the 2-D SB-DCT. The two-dimensional subband transforms are based on subband decomposition of the input sequence in both dimensions. They use knowledge about the input signal to obtain an approximation to their transform by discarding the computations in b... View full abstract»

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  • Image reconstruction by conditional entropy maximisation for PET system

    Publication Year: 2004, Page(s):345 - 352
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (686 KB)

    The authors show that the conditional entropy maximisation algorithm is a generalised version of the maximum likelihood algorithm for positron emission tomography (PET). Promising properties of the conditional entropy maximisation algorithm are as follows: an assumption is made that the entropy of the information content of the data should be maximised; it is a consistent way of selecting an image... View full abstract»

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  • GA-based DCT quantisation table design procedure for medical images

    Publication Year: 2004, Page(s):353 - 359
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (497 KB)

    Medical images are widely used in the diagnosis of diseases. These imaging modalities include computerised tomography (CT), magnetic resonance imaging (MRI), ultrasonic (US) imaging, X-radiographs, etc. However, medical images have large storage requirements when high resolution is demanded; therefore, they need to be compressed to reduce the data size so as to achieve a low bit rate for transmiss... View full abstract»

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  • Implementation of uniform and simultaneous ART for 3-D reconstruction in an X-ray imaging system

    Publication Year: 2004, Page(s):360 - 368
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (986 KB)

    The authors propose a 3-D volume reconstruction method using X-ray images with a calibration method to implement it in an X-ray imaging system. Previously the authors have proposed an advanced 3-D reconstruction algorithm based on an algebraic reconstruction technique (ART), called a uniform and simultaneous ART (USART). In practice, however, there are two main issues in implementing it in a reali... View full abstract»

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