A Study of Speckle Noise Reduction Filters

Ultrasound images and SAR i.e. synthetic aperture radar images are usually corrupted because of speckle noise also called as granular noise.It is quite a tedious task to remove such noise and analyze those corrupted images.Till now many researchers worked to remove speckle noise using frequency domain methods, temporal methods, and adaptive methods.Different filters have been developed as Mean and Median filters, Statistic Lee filter, Statistic Kuan filter, Frost filter, Srad filter.This paper reviews filters used to remove speckle noise.