3 February 2009 Dictionary-based probability density function estimation for high-resolution SAR data
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Proceedings Volume 7246, Computational Imaging VII; 72460S (2009); doi: 10.1117/12.816102
Event: IS&T/SPIE Electronic Imaging, 2009, San Jose, California, United States
Abstract
In the context of remotely sensed data analysis, a crucial problem is represented by the need to develop accurate models for the statistics of pixel intensities. In this work, we develop a parametric finite mixture model for the statistics of pixel intensities in high resolution synthetic aperture radar (SAR) images. This method is an extension of previously existing method for lower resolution images. The method integrates the stochastic expectation maximization (SEM) scheme and the method of log-cumulants (MoLC) with an automatic technique to select, for each mixture component, an optimal parametric model taken from a predefined dictionary of parametric probability density functions (pdf). The proposed dictionary consists of eight state-of-the-art SAR-specific pdfs: Nakagami, log-normal, generalized Gaussian Rayleigh, Heavy-tailed Rayleigh, Weibull, K-root, Fisher and generalized Gamma. The designed scheme is endowed with the novel initialization procedure and the algorithm to automatically estimate the optimal number of mixture components. The experimental results with a set of several high resolution COSMO-SkyMed images demonstrate the high accuracy of the designed algorithm, both from the viewpoint of a visual comparison of the histograms, and from the viewpoint of quantitive accuracy measures such as correlation coefficient (above 99,5%). The method proves to be effective on all the considered images, remaining accurate for multimodal and highly heterogeneous scenes.
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Vladimir Krylov, Gabriele Moser, Sebastiano B. Serpico, Josiane Zerubia, "Dictionary-based probability density function estimation for high-resolution SAR data", Proc. SPIE 7246, Computational Imaging VII, 72460S (3 February 2009); doi: 10.1117/12.816102; https://doi.org/10.1117/12.816102
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KEYWORDS
Synthetic aperture radar

Associative arrays

Scanning electron microscopy

Data modeling

Image resolution

Expectation maximization algorithms

Algorithm development

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