caa a22 4500 477097685 CHVBK 20180405111532.0 cr unu---uuuuu 170330e19960501xx s 000 0 fre 10.1007/BF02999803 doi (NATIONALLICENCE)springer-10.1007/BF02999803 Filtrage du speckle dans les images ros par modification de contraste, comparaison avec une grande classe de filtres [Elektronische Daten] [Ali Saad, Safwan Assad, Dominique Barba] Speckle filtering in SAR images by contrast modification, comparison with a large class of filters Speckle appearing in synthetic aperture radar (sar) images is generated by coherent processing of radar signals. Basically the speckle has the nature of multiplicative noise. Recently, several methods have been proposed to remove speckle in sar images, among them, Lee's methods, Frost's method and Zamperoni's method. In this paper, we propose an effective method for smoothing speckle-corrupted images. Digital processing is introduced, based on a contrast modification in a multi-resolution pyramid image representation. The contrast modification is realized by a median filter or an adaptive order filter giving a reconstructed image. For assessing this new method, we realized a comparative study with several noise-smoothing algorithms. Springer-Verlag, 1996 Synthetic aperture radar nationallicence Speckle nationallicence Coherent radiation nationallicence Multiplicative noise reduction nationallicence Contrast nationallicence Filtering nationallicence Comparative study nationallicence Radar ouverture synthétique nationallicence Tacheture nationallicence Rayonnement cohérent nationallicence Bruit multiplicatif nationallicence Réduction bruit nationallicence Contraste nationallicence Filtrage nationallicence Etude comparative nationallicence Saad Ali sei (Systèmes Electroniques et Informatiques), ireste, La Chantrerie, CP 3003, F-44087, Nantes Cedex 03, France aut Assad Safwan sei (Systèmes Electroniques et Informatiques), ireste, La Chantrerie, CP 3003, F-44087, Nantes Cedex 03, France aut Barba Dominique sei (Systèmes Electroniques et Informatiques), ireste, La Chantrerie, CP 3003, F-44087, Nantes Cedex 03, France aut Annales Des Télécommunications Springer-Verlag 51/5-6(1996-05-01), 233-244 0003-4347 51:5-6<233 1996 51 12243 https://doi.org/10.1007/BF02999803 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02999803 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Saad Ali sei (Systèmes Electroniques et Informatiques), ireste, La Chantrerie, CP 3003, F-44087, Nantes Cedex 03, France aut NATIONALLICENCE 700 1- Assad Safwan sei (Systèmes Electroniques et Informatiques), ireste, La Chantrerie, CP 3003, F-44087, Nantes Cedex 03, France aut NATIONALLICENCE 700 1- Barba Dominique sei (Systèmes Electroniques et Informatiques), ireste, La Chantrerie, CP 3003, F-44087, Nantes Cedex 03, France aut NATIONALLICENCE 773 0- Annales Des Télécommunications Springer-Verlag 51/5-6(1996-05-01), 233-244 0003-4347 51:5-6<233 1996 51 12243 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer