Method and device for inserting a watermarking signal in an image
First Claim
1. Method of inserting a watermarking signal (w) in a set (X) of coefficients (Xl) representing a digital image (I), in which at least one subset of coefficients is modified by said watermarking signal (w), said method comprising, for each representative coefficient (Xi) to be modified, the following steps:
- determining a neighbourhood (V(Xi)) of said representative coefficient (Xi) to be modified, in the image (I);
selecting a neighbourhood (Vsimd) in a dictionary of neighbourhoods representing coefficients representing said image (I), according to a predetermined criterion of similarity with said neighbourhood (V(Xi)) of said representative coefficient (Xi); and
modifying said representative coefficient (Xi) as a function of the watermarking signal (w) and a predetermined masking data item (M(Vsimd)) representing the masking effect on a watermarking signal of said neighbourhood (Vsimd) selected from the dictionary.
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Abstract
A method of inserting a watermarking signal (w) in a set (X) of coefficients (Xl) 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 (Xl) to be modified, a step of determining a neighborhood (V(Xi)) of the representative coefficient (Xl) to be modified, in the image (I); a step of selecting a neighborhood (Vsimd) in a dictionary of neighborhoods representing coefficients representing the image (I), according to a predetermined criterion of similarity with the neighborhood (V(Xi)) of the representative coefficient (Xl) under consideration; and a step of modifying the representative coefficient (Xi) as a function of the watermarking signal (w) and a predetermined masking data item (M(Vsimd)) representing the masking effect on a watermarking signal, of the neighborhood (Vsimd) selected in the dictionary.
71 Citations
28 Claims
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1. Method of inserting a watermarking signal (w) in a set (X) of coefficients (Xl) representing a digital image (I), in which at least one subset of coefficients is modified by said watermarking signal (w), said method comprising, for each representative coefficient (Xi) to be modified, the following steps:
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determining a neighbourhood (V(Xi)) of said representative coefficient (Xi) to be modified, in the image (I);
selecting a neighbourhood (Vsimd) in a dictionary of neighbourhoods representing coefficients representing said image (I), according to a predetermined criterion of similarity with said neighbourhood (V(Xi)) of said representative coefficient (Xi); and
modifying said representative coefficient (Xi) as a function of the watermarking signal (w) and a predetermined masking data item (M(Vsimd)) representing the masking effect on a watermarking signal of said neighbourhood (Vsimd) selected from the dictionary. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 17, 19, 21, 23, 25, 27)
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14. Device for inserting a watermarking signal (w) in a set (X) of coefficients (Xi) representing a digital image (I), in which at least one subset of coefficients is modified by said watermarking signal (w), said device comprising, for each representative coefficient (Xl) to be modified:
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means of determining a neighbourhood (V(Xl)) of said representative coefficient (Xi) to be modified, in the image (I);
means of selecting a neighbourhood (Vsimd) in a dictionary of neighbourhoods representing coefficients representing said image (I), according to a predetermined criterion of similarity with said neighbourhood (V(Xi)) of the representative coefficient (Xl); and
means of modifying said representative coefficient (Xl) as a function of the watermarking signal (w) and a predetermined masking data item (M(Vsimd)) representing the masking effect on a watermarking signal, of said neighbourhood (Vsimd) selected from the dictionary. - View Dependent Claims (15, 18, 20, 22, 24, 26, 28)
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Specification