ICY Anisotropic Filter

Anisotropic filter implements the classical Coherence Enhancing Diffusion Filter [Weickert]. The plugins works on the first band of a 2D, 3D and 4D sequence. 2D and 3D algorithms are proposed. For the 3D case 2 options are available: CED 1D option is the classical filter that acts mainly on the most homogeneous structure direction; CED 2D option acts on the tangential plane of the structure.