DIGITAL WATERMARK EMBEDDING APPARATUS, DIGITAL WATERMARK EMBEDDING METHOD, DIGITAL WATERMARK DETECTING APPARATUS, AND DIGITAL WATERMARK DETECTING METHOD

摘要

PROBLEM TO BE SOLVED: To provide resistance to collusion attacks and improve practicality.

SOLUTION: A digital watermark embedding apparatus comprises: a codeword generation unit that generates a first codeword including a bit sequence of digital watermark information; a shift sequence generation unit that generates a cyclic shift sequence on the basis of the digital watermark information; a shifting unit that generates a second codeword by cyclically shifting the first codeword on the basis of the generated cyclic shift sequence; and an embedding unit that embeds the generated second codeword in a content.

COPYRIGHT: (C)2013,JPO&INPIT