Patent ID: 6643383
Filing Date: 2003-11-04
Classification: G06T,H04N

Abstract:
A process for hiding primary numerical information (Iinf1) inside an initial numerical document (Iorig), comprising the steps of:generating a numerical document of reference (Iref) as a function of said initial numerical document (Iorig); generating a gap image, said gap image being the difference between said initial numerical document (Iorig) and said numerical document of reference (Iref); generating a secondary numerical information (Iinf2) as a function of said gap image and said primary numerical information (Iref) for hiding said primary numerical information (Iinf1); and adding said secondary numerical information (Iinf2) to said numerical document of reference (Iref) in order to obtain a modified initial numerical document (Iâ€²orig) close to the initial numerical document (Iorig), said modified initial document having no visual distortion from hiding the primary numerical information (Iinf1).