Speckle reduction and enhancement of SAR images using multiwavelets and adaptive thresholding
Jóhannes R. Sveinsson, Jón Atli Benediktsson · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1999
Speckle reduction and enhancement of synthetic aperture radar (SAR) images with multiple wavelets (multiwavelets) are proposed and investigated. Multiwavelet 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. A non-linear speckle reduction method based on adaptive sigmoid thresholding of the multiwavelet coefficients for logarithmically transformed SAR image data is investigated. The proposed methods show great promise for speckle removal and hence provide good detection performance for SAR based recognition.