Patent ID: 6693965
Filing Date: 2004-02-17
Classification: G06T,H04N

Abstract:
A digital information embedding apparatus for embedding inherent digital information in a digital image signal, said apparatus comprising:band division means for dividing the digital image signal into a plurality of frequency bands to obtain wavelet coefficients using either discrete wavelet transformation or sub-band division; block division means for dividing the frequency band in which the digital information is to be embedded (hereinafter referred to as embedding object region) out of the frequency bands obtained by the division of the digital image signal into a plurality of blocks in a predetermined block size; key generation means for respectively generating secondary keys having different values from a key having a predetermined value using a predetermined function with respect to information composing the digital information; information embedding means for specifying the block in the embedding object region on the basis of each of the generated secondary keys, and respectively embedding the corresponding information composing the digital information in the wavelet coefficients in the specified block in the embedding object region; and band synthesis means for reconstructing a digital image signal in which the digital information has been embedded using the embedding object region after the embedding processing and the plurality of frequency bands other than the embedding object region.