Translation invariant wavelets for speckle reduction of SAR images

Author

Sveinsson, Johannes R. ; Hilmarsson, Omar ; Benediktsson, Jon Atli

Author_Institution

Eng. Res. Inst., Iceland Univ., Reykjavik, Iceland

Volume

2

fYear

1998

fDate

6-10 Jul 1998

Firstpage

1121

Abstract

Speckle reduction and enhancement of synthetic aperture radar (SAR) images with translation-invariant wavelets are proposed. The proposed transformations are 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. The thresholding are nonlinear functions which are adapted for each of selected subband-images and are based on sigmoid functions. The proposed method shows great promise for speckle removal and hence provides good detection performance for SAR based recognition

Keywords

geophysical signal processing; geophysical techniques; radar imaging; remote sensing by radar; speckle; synthetic aperture radar; wavelet transforms; SAR image; enhancement; geophysical measurement technique; land surface; nonlinear functions; radar imaging; radar remote sensing; speckle reduction; subband-images; synthetic aperture radar; terrain mapping; thresholding; transformation; translation invariant wavelets; translation-invariant wavelets; wavelet transform; Additive noise; Cost function; Earth; Image resolution; Noise level; Noise reduction; Pixel; Signal resolution; Speckle; Wavelet coefficients;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium Proceedings, 1998. IGARSS '98. 1998 IEEE International

Conference_Location

Seattle, WA

Print_ISBN

0-7803-4403-0

Type

conf

DOI

10.1109/IGARSS.1998.699692

Filename

699692