Patent ID: 6728408
Filing Date: 2004-04-27
Classification: G06T,H04N

Abstract:
A data embedding method of embedding watermarking data x in a two-dimensional image having m horizontal pixels and n vertical pixels, comprising the steps of:selecting two-dimensional partial images based on the watermarking data x, the two-dimensional partial image having k horizontal pixels (kÃ—i=m, where k, i and m are positive integers) and l vertical pixels (lÃ—j=n, where l, j and n are positive integers), wherein said two-dimensional partial images are selected from the two-dimensional image based on watermarking information to be embedded in the two-dimensional image so that positional relation between said selected two-dimensional partial images forms the watermarking information; and changing a value of each pixel of the selected two-dimensional partial image such that an arithmetic operation value of pixel values of the selected two-dimensional partial image takes a specific value to generate digital watermarks, thereby distinguishing the selected two-dimensional partial images from the other two-dimensional partial images not selected.