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Proceedings Paper

Information-theoretic multitemporal features for change analysis from SAR images
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Paper Abstract

Multitemporal analysis of Synthetic Aperture Radar (SAR) images has gained an ever increasing attention due to the availability of several satellite platforms with different revisit times and to the intrinsic capability of the SAR system of producing all-weather observations. As a drawback, automated analysis in general and change detection in particular are made dfficult by the inherent noisiness of SAR imagery. Even if a preprocessing step aimed at speckle reduction is adopted, most of algorithms borrowed from computer vision cannot be profitably used. In this work, a novel pixel feature suitable for change analysis is derived from information-theoretic concepts. It does not require preliminary despeckling and is capable of providing accurate change maps from a couple of SAR images. The rationale is that the negative of logarithm of the probability of an amplitude level in one image conditional to the level of the same pixel in the other image conveys an information on the amount of change occurred between the two passes. Experimental results carried out on two couples of multitemporal SAR images demonstrate that the proposed IT feature outperforms the Log-Ratio in terms of capability of discriminating either burnt or flooded areas and is less sensitive than Log-Ratio to changes in acquisition angle between the two SAR images.

Paper Details

Date Published: 10 October 2008
PDF: 7 pages
Proc. SPIE 7109, Image and Signal Processing for Remote Sensing XIV, 71090S (10 October 2008); doi: 10.1117/12.800739
Show Author Affiliations
Bruno Aiazzi, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
Luciano Alparone, Univ. of Florence (Italy)
Stefano Baronti, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
Andrea Garzelli, Univ. of Siena (Italy)
Filippo Nencini, Univ. of Siena (Italy)

Published in SPIE Proceedings Vol. 7109:
Image and Signal Processing for Remote Sensing XIV
Lorenzo Bruzzone; Claudia Notarnicola; Francesco Posa, Editor(s)

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