Centre de documentation
scientifique

Distance measure based change detectors for polarimetric SAR imagery / Yonghong Zhang in Photogrammetric Engineering & Remote Sensing, PERS, vol 82 n° 9 (September 2016)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 82 n° 9 (September 2016) . - pp 719 - 727 Titre : Distance measure based change detectors for polarimetric SAR imagery Type de document : Article/Communication Auteurs : Yonghong Zhang, Auteur ; Hong'an Wu, Auteur ; Huiqin Wang, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 719 - 727 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] détecteur [Termes IGN] détection de changement [Termes IGN] données polarimétriques [Termes IGN] image radar moirée [Termes IGN] logarithme [Termes IGN] mesurage de distances [Termes IGN] polarimétrie radar Résumé : (Auteur) Change detection based on multi-temporal SAR images is a fundamental process in many practical applications. Popular SAR change detectors include ratio and logarithmic-ratio (log-ratio) operators, and those based on a statistical similarity between temporal images. The ratio and log-ratio operators are not ideal for polarimetric SAR (POLSAR) images, as only the intensity or amplitude information is used. Change detectors based on similarity comparison of probability distribution functions are difficult to implement and not reliable because of the uncertainties in estimating distribution parameters. Our research aims to find a reliable and computationally simple change detector from among three typical polarimetric distance measures. The change detection potential and abilities of these distance measures are analyzed from a mathematical point of view, and then compared through a test dataset composed of two RADARSAT-2 fine-quad polarized images. The symmetric revised Wishart (SRW) distance, originally developed for image segmentation, is found to be an effective change detector. Based on the test data, the change map derived from the SRW distance achieves 93.24 percent change rate and 5.67 percent false alarm rate. Furthermore, the eigendecompostion of the SRW distance is given for the first time, which uncovers the linkage of the SRW distance with the scattering mechanisms and the corresponding amplitudes embedded in two polarimetric covariance matrices, forming a theoretical explanation for the superiority of the SRW distance as a change detector. Our research indicates the general applicability of the SRW distance for POLSAR change detection. Numéro de notice : A2016-742 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.82.9.719 En ligne : https://doi.org/10.14358/PERS.82.9.719 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82279 [article]