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Abstract

A method of inserting a watermarking signal (w) in a set (X) of coefficients (X.sub.i) representing a digital image (I), in which at least one subset of coefficients is modified by said watermarking signal (w), comprises, for each representative coefficient (X.sub.i) to be modified, a step of determining a neighborhood (V(X.sub.i)) of the representative coefficient (X.sub.i) to be modified, in the image (I); a step of selecting a neighborhood (V.sub.sim.sup.d) in a dictionary of neighborhoods representing coefficients representing the image (I), according to a predetermined criterion of similarity with the neighborhood (V(X.sub.i)) of the representative coefficient (X.sub.i) under consideration; and a step of modifying the representative coefficient (X.sub.i) as a function of the watermarking signal (w) and a predetermined masking data item (M(V.sub.sim.sup.d)) representing the masking effect on a watermarking signal, of the neighborhood (V.sub.sim.sup.d) selected in the dictionary.

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First Claim