Feature enhancement

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.

The aim of this plugin is to characterise the orientation and isotropy properties of a region of interest (ROI) in an image, based on the evaluation of the gradient structure tensor in a local neighborhood.