Title :
Speckle reduction of SAR images in the complex wavelet domain
Author :
Sveinsson, Johannes R. ; Benediktsson, Jon Atli
Author_Institution :
Dept. of Electr. & Comput. Eng., Iceland Univ., Reykjavik, Iceland
Abstract :
Dual tree complex wavelet transformation (CWT), proposed by N. G. Kingsbury (1999), is used for speckle reduction of SAR images. The CWT is useful for speckle reduction through its subband images and the speckle reduction is obtained by thresholding the subband-image coefficients of the digitized SAR images. Two thresholding methods are used; soft thresholding and thresholding using non-linear functions which are adapted for each of selected subband and is based on sigmiod functions. The denoising method shows great promise for speckle removal and hence should provide good detection performance for SAR based recognition
Keywords :
geophysical signal processing; geophysical techniques; radar imaging; remote sensing by radar; speckle; synthetic aperture radar; terrain mapping; wavelet transforms; SAR; SAR images; complex wavelet domain; denoising; dual tree complex wavelet transformation; geophysical measurement technique; land surface; nonlinear functions; radar imaging; radar remote sensing; sigmoid functions; speckle reduction; speckle removal; subband image coefficients; subband images; synthetic aperture radar; terrain mapping; thresholding; Speckle; Wavelet domain;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2001. IGARSS '01. IEEE 2001 International
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-7031-7
DOI :
10.1109/IGARSS.2001.977997
