SAR Image De-speckling Based on Lifting Wavelet Transform
Hanlin Chen · Bulletin of Science and Technology · 2008
Speckle noise is a common phenomenon in SAR images.The reduction of Speckle is necessary for any further processing of Synthetic Aperture Radar image such as auto-segmentation,classification,object detecting and other procedures for special topic information extraction.In this paper,after a brief review of conventional filters for SAR speckle reduction,a lifting wavelet-based filter for SAR image de-speckling is presented.To evaluate the performance of this filter,four statistical measurements are used.The performances are compared in several aspects including Radiometric preservation,feature preservation,speckle reduction in the extended uniform regions and the absence of artifacts.The results show that the proposed filter performs better in many aspects in evaluation than the conventional filters do.