Patent ID: 7137005
Filing Date: 2006-11-14
Classification: G06T,H04N

Abstract:
1. A method of inserting a watermark into digital media data, the method comprising: calculating a working matrix X, each element of which is a predetermined function of each subset of source digital data; calculating a matrix C by C=XX calculating eigen-values and an eigen-vector-matrix P of said matrix C; calculating a matrix of main components Y by Y=P choosing k strings of said matrix Y; calculating coefficients a  wherein a watermark is represented by a set of numbers w calculating a marked string z  1≦j≦n, with n being an integer, and replacing one of said chosen strings of Y with z calculating a matrix {tilde over (Y)} orthogonalized from said matrix Y; calculating a watermarked working matrix {tilde over (X)} by {tilde over (X)}=P{tilde over (Y)}; and marking said source digital data using said watermarked working matrix {tilde over (X)}.