Encoding Visual Information Using Anisotropic Transformations

The evolution of information in images undergoing fine-to-coarse anisotropic transformations is analyzed by using an approach based on the theory of irreversible transformations. In particular, we show that, when an anisotropic diffusion model is used, local variation of entropy production over space and scale provides the basis for a general method to extract relevant image features. Index Terms--Scale space, anisotropic diffusion, entropy production, feature encoding.