Dictionary-Based Stochastic Expectation–Maximization for SAR Amplitude Probability Density Function EstimationReport as inadecuate




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1 DIBE - Department of Biophysical and Electronic Engineering Genoa 2 ARIANA - Inverse problems in earth monitoring CRISAM - Inria Sophia Antipolis - Méditerranée , SIS - Signal, Images et Systèmes

Abstract : In remotely sensed data analysis, a crucial problem is represented by the need to develop accurate models for the statistics of the pixel intensities. This paper deals with the problem of probability density function pdf estimation in the context of synthetic aperture radar SAR amplitude data analysis. Several theoretical and heuristic models for the pdfs of SAR data have been proposed in the literature, which have been proved to be effective for different land-cover typologies, thus making the choice of a single optimal parametric pdf a hard task, especially when dealing with heterogeneous SAR data. In this paper, an innovative estimation algorithm is described, which faces such a problem by adopting a finite mixture model for the amplitude pdf, with mixture components belonging to a given dictionary of SAR-specific pdfs. The proposed method automatically integrates the procedures of selection of the optimal model for each component, of parameter estimation, and of optimization of the number of components by combining the stochastic expectation–maximization iterative methodology with the recently developed -method-of-log-cumulants- for parametric pdf estimation in the case of nonnegative random variables. Experimental results on several real SAR images are reported, showing that the proposed method accurately models the statistics of SAR amplitude data.

Keywords : finite mixture models FMMs parametric estimation probability density function estimation stochastic expectation maximization SEM synthetic aperture radar SAR images





Author: Gabriele Moser - Josiane Zerubia - Sebastiano B. Serpico -

Source: https://hal.archives-ouvertes.fr/



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