Title:
印刷対象物と関連した適用業務の為の認証用ウォータマーク
Document Type and Number:
Japanese Patent JP4800553
Kind Code:
B2
Abstract:
The disclosure describes systems for creating and authenticating printed objects using authentication and copy detection watermarks. For example, one verification system includes a watermark decoder and a verification module. The watermark decoder detects a copy detection watermark in a printed object to determine whether the printed object has been reproduced. The verification module processes a message decoded from an authentication watermark on the printed object to authenticate the printed object or bearer of the printed object. The authentication and copy detection watermarks may be implemented as the same or different watermarks. For example, the copy detection watermark may be a fragile watermark that carries the message and that degrades in response to a reproduction operation, such as photocopying or scanning and then reprinting the object. Alternatively, the authentication and copy detection watermarks may be separate watermarks embedded in an image that is printed on the object. The authentication watermark, in some applications, includes an identifier that links the object to a database entry with related information about the object. This related information can be used to check the bearer of the object by comparing it with attributes of the bearer (such as a user ID or photo) or the validity of the object by comparing it with attributes that are visible or machine readable on the object.
Inventors:
Perry, Burt, W.
Carl, Jay., Scott
Carl, Jay., Scott
Application Number:
JP2002514649A
Publication Date:
October 26, 2011
Filing Date:
July 24, 2001
Export Citation:
Assignee:
DigiMark Corporation
International Classes:
B42D15/10; B41J21/00; G06F21/10; G06F21/12; G06Q10/00; G06T1/00; G07D7/00; G07D7/12; G07D7/20; H04N1/32; H04N1/387; H04N1/40
Foreign References:
| US5974150 | ||||
| US5892900 |
Attorney, Agent or Firm:
Shoichi Okuyama
Arihara Koichi
Matsushima Tetsuo
Hidefumi Kawamura
Naomi Yoshida
Ayako Nakamura
Fukagawa Eri
Satoshi Morimoto
Kyoko Tsunoda
Hirose Miki
Yu Tanaka
Tokumoto Koichi
Atsushi Watanabe
Ikeda adult
Kazuhiro Yamaguchi
Masakazu Noda
Arihara Koichi
Matsushima Tetsuo
Hidefumi Kawamura
Naomi Yoshida
Ayako Nakamura
Fukagawa Eri
Satoshi Morimoto
Kyoko Tsunoda
Hirose Miki
Yu Tanaka
Tokumoto Koichi
Atsushi Watanabe
Ikeda adult
Kazuhiro Yamaguchi
Masakazu Noda