NON-LOCAL COMPUTATION OF GRADIENT NOISE FOR COMPUTER-GENERATED DIGITAL IMAGES

This invention relates to a method for transforming a digital image comprising applying a procedural noise onto a parameter of an image element of said digital image, comprising ¨ determining a range of the lattice (L) of said noise, comprising said image element; ¨ for each noise vertex (S) of said lattice within said range, determining a gradient value G(S) as a pseudorandom value, and add to the parameter associated with each image vertex (P) of said image element within a neighbourhood of said vertex, a contribution depending on said gradient value, and on the relative positions of said image vertex and noise vertex..