Polarimetric whitening filter (PWF) method for speckle reduction in polarimetric synthetic aperture radar (SAR) is stated here

with some traditional covariance matrix parameter estimate method.Aimed at their defects in parameter estimation

an enhanced auto-adaptive edge-detection method for parameter estimating is presented firstly.For the lack of point target and line detection in the above-mentioned methods

a new parameter estimation method is then introduced.At last

results of above-mentioned methods applied in PWF are submitted.Detailed analyses and comparisons are also presented.It is proved that the new parameter estimation method is the most robust.