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Proceedings Paper

Property analysis of noise-suppressing L-filters for speckle image processing
Author(s): Vladimir V. Lukin; Vladimir P. Melnik; Victor I. Chemerovsky; Alexander A. Zelensky; Jaakko T. Astola; Pauli Kuosmanen; Heikki Huttunen
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Paper Abstract

The images formed by coherent imaging systems are characterized by presence of multiplicative noise with non- symmetrical p.d.f.s. The examples are the Rayleigh and one- side (negative) exponential distributions. For these cases the optimal L-filters are derived for different coefficient censoring by minimizing MSE of residual fluctuations. Some sub-optimal L-filters are considered as well. They are the Lpq-filters that use only two order statistics and the trimmed filters with symmetrical and nonsymmetrical coefficient censoring. Those filters are parametrically optimized according to the same criterion. The robust features of the considered filters are analyzed both theoretically using empirical influence functions and numerically with application of contamination noise model. As contaminating factor we exploited the salt-and-pepper noise with different probabilities and amplitudes of positive and negative spikes. Output estimate bias and variance were calculated and examined. It is shown that the use of sub-optimal filters is well motivated from different points of view.

Paper Details

Date Published: 5 March 1999
PDF: 11 pages
Proc. SPIE 3646, Nonlinear Image Processing X, (5 March 1999); doi: 10.1117/12.341083
Show Author Affiliations
Vladimir V. Lukin, Kharkov Aviation Institute (Ukraine)
Vladimir P. Melnik, Kharkov Aviation Institute and Tampere Univ. of Technology (Finland) (Finland)
Victor I. Chemerovsky, Kharkov Aviation Institute (Ukraine)
Alexander A. Zelensky, Kharkov Aviation Institute (Ukraine)
Jaakko T. Astola, Tampere Univ. of Technology (Finland)
Pauli Kuosmanen, Tampere Univ. of Technology (Finland)
Heikki Huttunen, Tampere Univ. of Technology (Finland)


Published in SPIE Proceedings Vol. 3646:
Nonlinear Image Processing X
Edward R. Dougherty; Jaakko T. Astola, Editor(s)

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