An Anisotropic Gaussian Filter for Noise Filtering of InSAR Interferogram

This paper addresses the problem of interferometric phase noise reduction in synthetic aperture radar interferometry. An anisotropic Gaussian filter is proposed in the paper. Different from those conventional isotropic filters, the filter can filter the phase noise according to the local fringe rates and the local noise levels. By using both, simulated and real interferometric phase images, the performance of the filter, in terms of fringes preservation and noise reduction, is demonstrated and compared with the mean filter and the median filter