公开(公告)号：JP2001086316A

公开(公告)日：2001-03-30

申请号：JP23474299

申请日：1999-08-20

Applicant: ACADEMIA SINICA

Inventor： RIYAO HON-YUAN MARK ,  RUU CHUN-SHEN

IPC: H04N19/60 ,  G06F21/10 ,  G06T1/00 ,  G09C5/00 ,  H04N1/387 ,  H04N1/41 ,  H04N19/467 ,  H04N19/63 ,  H04N19/70 ,  H04N19/85 ,  H04N19/91

Abstract: PROBLEM TO BE SOLVED: To realize a method for embedding a watermark in an image by which the watermark endures various attacks. SOLUTION: A new image-protecting system named 'Cocktail watermarking' embeds two watermarks, which are generated by positive and negative watermark generators 214 and 218 and play a complementary part in an original image as the current spread spectrum watermarking approach and generates an image 130 with watermarks. The image protection system has characteristics as to leave at least one watermark sufficiently, even though any kind of an attack is applied to the image 130 with watermarks and has been proved to be effective in terms of enduring various attacks 150 by wide range test results.