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IEE Proceedings - Vision, Image and Signal Processing

Issue 4 • Date Aug 1997

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Displaying Results 1 - 12 of 12
  • Similarity measure for superquadrics

    Publication Year: 1997, Page(s):237 - 243
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (764 KB)

    Superquadrics with parametric deformations are suitable models for use as solid primitives for describing a complicated 3-D object. Some different methods for the recovery of superquadric primitives from range data have been proposed, but there is still no effective similarity measure for the matching task between two superquadrics in a 3-D object recognition system. The authors propose a similari... View full abstract»

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  • Direct reconstruction method for wavelet transform extrema representation

    Publication Year: 1997, Page(s):193 - 198
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (544 KB)

    In contrast to the iterative reconstruction algorithm of projections onto convex sets a noniterative method that completely solves the problem of reconstructing from the wavelet transform extrema representation is presented for the first time. The solution obtained by the proposed method is mathematically consistent and is indistinguishable from the true solution, i.e. both give the same represent... View full abstract»

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  • Multiple resolution image restoration

    Publication Year: 1997, Page(s):199 - 206
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (904 KB)

    A new algorithm for solving the deconvolution problem is proposed. This algorithm uses the wavelet transform to induce a multiresolution approach to deconvolve a blurred signal/image. The low resolution part of a signal/image is restored first and then high resolution information is added successively into the estimation process. Two different ways to incorporate the image space positivity constra... View full abstract»

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  • Closed-loop motion compensation for video coding standards

    Publication Year: 1997, Page(s):227 - 232
    Cited by:  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (576 KB)

    In the classical block-matching motion-estimation approach, the motion vectors which result in minimum distortion between the estimated and the actual image block are chosen. However, these motion vectors may not be optimal in terms of coding efficiency. An analysis by synthesis method which selects the optimal motion vectors, using the resulting bit rate and distortion, is presented. A significan... View full abstract»

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  • Efficient weighted least-squares algorithm for the design of FIR filters

    Publication Year: 1997, Page(s):244 - 248
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    The weighted least-squares (WLS) technique has been widely used for the design of digital FIR filters. In the conventional WLS, the filter coefficients are obtained by performing a matrix inverse operation, which needs computation of O(N3). The authors present a new WLS algorithm that introduces an extra frequency response including implicitly the weight function. In the new algorithm, ... View full abstract»

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  • Enhanced interframe coding based on morphological segmentation

    Publication Year: 1997, Page(s):220 - 226
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (960 KB)

    Morphological segmentation has been proposed as an attractive alternative to transform-based compression for interframe coding of digital video. Being a spatial approach, segmentation based coding eliminates the artefacts commonly associated with transform coding, such as ringing around sharp edges. One disadvantage of this method is that it can introduce spurious edges in the reconstructed video ... View full abstract»

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  • Illuminant-tilt estimation from images of isotropic texture

    Publication Year: 1997, Page(s):213 - 219
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (956 KB)

    The authors present a new illuminant-tilt-angle estimator that works with isotropic textures. It has been developed from Kube and Pentland's (1988) frequency-domain model of images of three-dimensional texture, and is compared with Knill's (1990) spatial-domain estimator. The frequency and spatial-domain theory behind each of the estimators is related via an alternative proof of the basic phenomen... View full abstract»

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  • Block algorithms for the parametric estimation of signals and systems

    Publication Year: 1997, Page(s):257 - 259
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (284 KB)

    Existing recursive parameter estimation methods use approximated covariance and gradient matrices which are actually computed as functions of the present parameter vector θˆ(t) by the matrices computed as functions of all previous parameter estimates θˆ(i) for i⩽t. By reducing the approximations considerably, modified versions of the recursive identification algorithms ar... View full abstract»

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  • Generalised method for pruning an FFT type of transform

    Publication Year: 1997, Page(s):189 - 192
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    A new pruning method for an FFT type of transform structure is proposed. Its novelty lies in the fact that, besides being able to prune the transform, it is able to complete a previously pruned transform or to progress from one level of pruning to another. The method can be directly applied to fast progressive image coding View full abstract»

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  • Adaptive resampling algorithm for image zooming

    Publication Year: 1997, Page(s):207 - 212
    Cited by:  Papers (12)  |  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (756 KB)

    Applying an interpolation function indiscriminately to an image, to resample it, will generally result in aliasing, edge blurring and other artefacts. The authors present an adaptive resampling algorithm for zooming up images. The algorithm is based on analysing the local structure of the image and applying a near optimal and least time-consuming resampling function will preserve edge locations an... View full abstract»

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  • Multiobjective neural network for image reconstruction

    Publication Year: 1997, Page(s):233 - 236
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    The authors propose a multiobjective neural network model and algorithm for image reconstruction from projections. This model combines the Hopfield model and multiobjective decision making approach. A weighted sum optimisation based neural network algorithm is developed. The dynamic process of the net is based on minimisation of a weighted sum energy function and Euler's iteration and this algorit... View full abstract»

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  • Bayesian approach to parameter estimation and interpolation of time-varying autoregressive processes using the Gibbs sampler

    Publication Year: 1997, Page(s):249 - 256
    Cited by:  Papers (11)  |  Patents (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (812 KB)

    A nonstationary time series is one in which the statistics of the process are a function of time; this time dependency makes it impossible to utilise standard analytically defined statistical estimators to parameterise the process. To overcome this difficulty, the time series is considered within a finite time interval and is modelled as a time-varying autoregressive (AR) process. The AR coefficie... View full abstract»

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