A Temporal Estimation of Entropy and Its Comparison With Spatial Estimations on PolSAR Images

Abstract : Most of the applications of SAR polarimetry such as classification are based on estimation of the polarimetric covari-ance matrix. This estimation is generally done through a boxcar spatial filtering. This estimation process can induce mixture if different scatterers are present in neighboring pixels. Since the po-larimetric entropy H is a measure of variability, this mixture can result in a very uniform entropy map. A nonlocal algorithm can be used to improve the estimation of the covariance matrices. The entropy maps are smoothed and contrast is better preserved. We propose a third estimation of H by using a temporal stack. Pixels are averaged on the time axis instead of on a spatial basis. On the datasets we studied, the temporal estimation increases the contrast of H maps. This contrast allows us to better discriminate targets. Temporal entropy is very influenced by the degree of coherence. Nevertheless, H temporal provides additional information, combining information about the polarimetric stability of scattering mechanisms over time.
Type de document :
Article dans une revue
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, IEEE, 2016, 9, pp.3809 - 3820. <10.1109/JSTARS.2016.2555243>
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-01386385
Contributeur : Flora Weissgerber <>
Soumis le : lundi 6 mars 2017 - 16:26:30
Dernière modification le : mardi 9 mai 2017 - 11:10:42
Document(s) archivé(s) le : mercredi 7 juin 2017 - 12:23:11

Fichier

FWeissgerber_JSTARS2016_articl...
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Citation

Flora Weissgerber, Elise Colin-Koeniguer, Nicolas Nicolas, Jean-Marie Nicolas. A Temporal Estimation of Entropy and Its Comparison With Spatial Estimations on PolSAR Images. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, IEEE, 2016, 9, pp.3809 - 3820. <10.1109/JSTARS.2016.2555243>. <hal-01386385>

Partager

Métriques

Consultations de
la notice

166

Téléchargements du document

98