Title:
印刷文書のための可視認証パターン
Document Type and Number:
Japanese Patent JP4554358
Kind Code:
B2
Abstract:
A technique for determining authenticity of analog forms such as packaging or documents determines whether the analog form has been made directly from a digital representation or by photocopying or scanning an analog form. The technique makes the determination by comparing an original digital representation of a portion of the analog form having an authentication pattern with a digital recording of the portion from the analog form and measuring differences in features that are affected by the operations of photocopying or scanning. The authentication pattern may depend on a key or on other information displayed on the analog form. Another pattern may be displayed on the analog form to locate the pattern.
Inventors:
Chao Chiang
Picard justin
Toe virus Niels
Picard justin
Toe virus Niels
Application Number:
JP2004505966A
Publication Date:
September 29, 2010
Filing Date:
May 14, 2003
Export Citation:
Assignee:
Mediasec Technologies Game Bha
International Classes:
B41J5/30; H04N1/387; G06K9/00; G06T1/00; G06T7/00; G07D7/12; G07D7/20
Domestic Patent References:
| JP200059604A |
Foreign References:
| WO2002031752A1 | ||||
| WO2002037309A1 |
Attorney, Agent or Firm:
Hatsushi Shimizu