InSAR interferogram detail-compensating filtering method based on the stationary wavelet transform

Abstract

Speckle is an inherent characteristic of InSAR (Interferometric Synthetic Aperture Radar) interferogram, it affects the accuracy of prediction and evaluation of urban Geology and Geohazards, so it is necessary to carry out interferogram filtering to suppress the effect of speckle. However, there is a contradiction between speckle reduction and keeping the details of the interferogram in current methods of interferogram filtering. Using the difference idea and the character of the wavelet transform, we propose InSAR interferogram detail-compensating filter method based on the stationary wavelet transform. And an experiment is made on the partial interferogram generated by two SAR images of Bam earthquake with this method. As a result, not only can the new method suppress the speckle effectively, but also it can maintain details of interferogram well by compensating the details, and it reduces the number of residual points greatly.