By Topic

IEE Proceedings - Vision, Image and Signal Processing

Issue 6 • Date Dec 1999

Filter Results

Displaying Results 1 - 9 of 9
  • Digital algorithm for maximisation of symmetric ambiguity functions and application to signal time-delay estimation

    Publication Year: 1999, Page(s):313 - 316
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    Ambiguity functions are usually symmetric around their maximum. In such a case, a consistent estimator of their median value can also detect their maximum. A digital algorithm searches for the zero-crossing point of the Hilbert transform of the estimated function samples. The performance of such a method is analysed by a reduced Taylor expansion, depending on the second-order statistics of the est... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive lossless coding scheme of lattice vector quantisation

    Publication Year: 1999, Page(s):317 - 325
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    In the process of quantisation, a lattice vector quantiser (LVQ) generates radius and index sequences. In lossless coding, the radius sequence is run-length coded and then Huffman or arithmetic coded, and the index sequence is represented by fixed binary bits. The author has improved the LVQ lossless coding by removing the redundant information between radius sequence and index sequence. An algori... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rotation invariant classification of rough surfaces

    Publication Year: 1999, Page(s):345 - 352
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (432 KB)

    Rotation of a rough, textured surface will not produce a simple rotation of the image texture. It follows that where image texture is a function of surface topography, existing rotation invariant texture classification algorithms are not robust to surface rotation. The effect of surface rotation on the observed image is analysed using an existing theory, a novel scheme to stabilise the classificat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of spatial transform motion estimation with overlapped compensation and fractional-pixel accuracy

    Publication Year: 1999, Page(s):339 - 344
    Cited by:  Patents (25)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors investigate how the performance of spatial transform motion estimation can be significantly improved by incorporating overlapped compensation and fractional-pixel accuracy. An overlapped spatial transformation (OST) motion model is developed, which successfully addresses the inability of the conventional block matching technique to compensate for complex motion and inside-block motion ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Estimating the distortion and entropy-coded bit rate of lattice vector quantiser for a Laplacian source

    Publication Year: 1999, Page(s):326 - 333
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    For practical use of lattice vector quantisers (LVQs), the codebook sizes are pre-decided and the lattice is scaled to control quantisation distortion and bit rate. Formulas are derived, estimating both the distortion and the bit rate as functions of a scaling factor of a LVQ, while a lossless coding method is specified as the rotational coordinate method and input sources are assumed to be Laplac... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Proposal for transparent cascading of 3:4 up and subsequent 4:3 down conversion filtering

    Publication Year: 1999, Page(s):334 - 338
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    A proposal is described which is based on a 3:4 FIR Nyquist up conversion filter and a corresponding 4:3 FIR Nyquist down conversion filter that on cascading result mathematically in the identity operator. The proposed filters are applied horizontally to critical video signals. Experimental results show that, despite the limited numerical precision of the filter coefficients and filter calculation... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Cumulant-based LP method for two-dimensional spectral estimation

    Publication Year: 1999, Page(s):307 - 312
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    A cumulant-based linear prediction (CBLP) method for two-dimensional (2-D) spectral estimation is presented. The main idea of the method is to compute the coefficients of two different single-quadrant prediction filters by applying the LP theory to a selected 2-D fourth-order mixed cumulant slice of the noisy signal. These coefficients are employed in formulating two different autoregressive spect... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Combining linear filtering and radial basis function networks for accurate profile recovery

    Publication Year: 1999, Page(s):297 - 305
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    The efficient method presented for the accurate approximation of signal profiles corrupted by noise is based on a principled combination of linear and nonlinear processing. The nonlinear processing is realised using a radial basis network which is designed, trained and validated within the strict time constraints set by instrumentation requirements. The quality of profile approximation and the dec... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A posteriori error learning in nonlinear adaptive filters

    Publication Year: 1999, Page(s):293 - 296
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (172 KB)

    The authors provide relationships between the a priori and a posteriori errors of adaptation algorithms for real-time output-error nonlinear adaptive filters realised as feedforward or recurrent neural networks. The analysis is undertaken for a general nonlinear activation function of a neuron, and for gradient-based learning algorithms, for both a feedforward (FF) and recurrent neural network (RN... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.