Table 1.

De-speckling filter parameters

Method	Abbreviation	Filter parameters
Lee filter	Lee	z = 5
Lee’s sigma filter	SLee	z = 5
Enhanced Lee filter	EnLee	z = 5
Frost filter	Frost	z = 5
Kaun filter	Kaun	z = 5
Geometric filter	Geo	n = 3
Speckle reducing anisotropic diffusion	SRAD	s = 0.2, n = 100, z = 5
Detail preserving anisotropic diffusion	DPAD	s = 0.2, n = 100, z = 5

z mask size, n number of iterations, s step size