Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6456727 | Method of extracting digital watermark information and method of judging but value of digital watermark information | Isao Echizen, Hiroshi Yoshiura, Kousuke Anzai | 2002-09-24 |
| 6418232 | Method of authenticating digital-watermark pictures | Kazunori Nakano, Juńichi Taguchi, Hiroshi Yoshiura, Isao Echizen | 2002-07-09 |