Statistical characterization of images — Anisotropy

The purposes of the paper are to contribute to the understanding of the notion of anisotropy of images and to expose details on a method for deriving global and local statistical features on materials, based on anisotropy. We introduce a definition of anisotropy related to the edges and improve measures of anisotropy. The images dealt with correspond mainly to non-woven fabrics based on polymeric fibers. A discussion of the applicative potential is included.