The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2004
Filed:
Jan. 09, 2001
Ioana Donescu, Rennes, FR;
Eric Nguyen, Rennes, FR;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of inserting a watermarking signal (w) in a set (X) of coefficients (X ) 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 ) to be modified, a step of determining a neighborhood (V(X )) of the representative coefficient (X ) to be modified, in the image (I); a step of selecting a neighborhood (V ) in a dictionary of neighborhoods representing coefficients representing the image (I), according to a predetermined criterion of similarity with the neighborhood (V(X )) of the representative coefficient (X ) under consideration; and a step of modifying the representative coefficient (X ) as a function of the watermarking signal (w) and a predetermined masking data item (M(V )) representing the masking effect on a watermarking signal, of the neighborhood (V ) selected in the dictionary.