1. Method for measuring the dissimilarity between a first and a second images, wherein the method comprises the following steps: a) multiresolution decomposition of the first and the second images to obtain coefficients of the first and of the second images, each coefficient being function of a scale and a location in space; b) constituting vectors hereafter named patches for the first and the second images; a patch at a given scale and a given location comprising: the coefficient having said given scale and said given location, at least one coefficient having said given scale and a location neighbor to said given location, and at least one coefficient having said given location and a scale neighbor to said given scale; c) evaluation of the dissimilarity between the probability density function of patches having a given scale and belonging to the first image and the probability density function of patches having the same scale and belonging to the second image, said dissimilarity being a partial measure of the dissimilarity between the first and the second images for said given scale.