Patent ID: 6724913
Filing Date: 2004-04-20
Classification: G06T

Abstract:
A method to embed into a digitized file a watermark, comprising:obtaining a modulated digitized image file; obtaining a modulated digitized watermark file; allocating in said digitized image file portions where human sense is less sensible to additional data being added into said portions; and adding into at least a part of said portions data representing said modulated digitized watermark file, wherein said step of allocating portions where human sense is less sensible to additional data being added comprises allocating elements in the transformation domain of said digitized image file to which additional data may be added with less sensibility by human sense, and also comprises the steps of: calculating capacity values of all elements in the transform domain of said digitized image file to obtain a matrix of said capacity values, said capacity values representing a power of resistance to noises of said elements; calculating, according to values and positions of said capacity values in said matrix of capacity values, human-sensibility values corresponding to each of said capacity values to obtain a matrix of human-sensibility values; and labeling in said matrix of human-sensibility values elements with human-sensibility values greater than a predetermined threshold.