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IEEE Signal Processing Letters

Issue 10 • Date Oct. 1998

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Displaying Results 1 - 8 of 8
  • On applying spatial constraints in fuzzy image clustering using a fuzzy rule-based system

    Publication Year: 1998, Page(s):245 - 247
    Cited by:  Papers (44)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (89 KB)

    A novel approach for enhancing the results of fuzzy clustering by imposing spatial constraints for solving image segmentation problems is presented. We have developed a Sugeno (185) type rule-based system with three inputs and 11 rules that interacts with the clustering results obtained by the well-known fuzzy c-means (FCM) and/or possibilistic c-means (PCM) algorithms. It provides good image segm... View full abstract»

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  • Tomographic reconstruction of circular and elliptical objects using genetic algorithm

    Publication Year: 1998, Page(s):248 - 251
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (110 KB)

    This paper addresses the model-based tomographic reconstruction from a limited number of noisy projections for the detection and estimation of multiple circular and elliptical objects of known intensities placed on a known uniform background. As the direct computation of the maximum-likelihood estimate is impractical even for small number of objects in the image, we have used an optimization strat... View full abstract»

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  • Fuzzy time-rank relations and order statistics

    Publication Year: 1998, Page(s):252 - 255
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (186 KB)

    The rank ordering of samples is widely used in robust statistics and robust signal processing. Advances in these areas have focused on utilizing joint time-rank (TR) information. The TR information utilized to date is that resulting from a binary, or crisp, relation between the marginal time and rank ordering of samples. This crisp relation, while powerful, contains no information on sample values... View full abstract»

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  • An inverse signal approach to computing the envelope of a real valued signal

    Publication Year: 1998, Page(s):256 - 259
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (163 KB)

    We address the problem of estimating the envelope of a real valued signal, s(t) that is observed for a duration of T seconds. We model s(t) using a Fourier series, by considering periodic extensions of the signal. By using an analog of the auto-correlation method of linear prediction on the Fourier coefficients of s(t) the envelope of the signal is estimated without explicitly computing the analyt... View full abstract»

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  • An "SVD+Viterbi" algorithm for multiuser adaptive blind equalization of mobile radio channels

    Publication Year: 1998, Page(s):260 - 264
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (135 KB)

    A fully adaptive algorithm for multiuser blind channel equalization is presented. The algorithm is based on an adaptive matrix singular value decomposition (SVD) for a (virtual) channel identification type operation and the Viterbi algorithm for subsequent symbol detection. Unlike other blind multiuser detection schemes that have appeared in the literature, the present algorithm removes multiple a... View full abstract»

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  • Adaptive denoising based on SURE risk

    Publication Year: 1998, Page(s):265 - 267
    Cited by:  Papers (73)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    A new adaptive denoising method is presented based on Stein's (1981) unbiased risk estimate (SURE) and on a new class of thresholding functions. First, we present a new class of thresholding functions that has a continuous derivative while the derivative of standard soft-thresholding function is not continuous. The new thresholding functions make it possible to construct the adaptive algorithm whe... View full abstract»

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  • On the stability of equation-error estimates of all-pole systems

    Publication Year: 1998, Page(s):268 - 270
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    It is well known that the standard equation-error (EE) method for the identification of linear systems yields biased estimates if the data are noise corrupted. Due to this bias, the resulting estimate can be unstable in some cases, depending on the spectral characteristics of the input and the noise, the signal-to-noise ratio (SNR), and the unknown system. The set of all-pole linear systems whose ... View full abstract»

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  • An information-theoretic derivation of the 2-D maximum entropy spectrum

    Publication Year: 1998, Page(s):271 - 272
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (105 KB)

    It is known that the spectrum of the two-dimensional (2-D) stochastic process maximizing the entropy rate, among stationary Gaussian processes subject to a finite number of autocorrelation constraints, is that of the 2-D autoregressive (AR) process. We consider a 2-D entropy maximization problem, in which stationarity and normality are not assumed. The burden of proof is then shifted from the prev... View full abstract»

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The IEEE Signal Processing Letters is a monthly, archival publication designed to provide rapid dissemination of original, cutting-edge ideas and timely, significant contributions in signal, image, speech, language and audio processing.

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Editor-in-Chief
Peter Willett
University of Connecticut
Storrs, CT 06269
peter.willett@uconn.edu