发明名称 |
PRINTING AND VALIDATION OF SELF VALIDATING SECURITY DOCUMENTS |
摘要 |
A passport or other document is steganographically encoded with two steganographic digital watermarks. Data conveyed by these watermarks can be cross-checked for expected correspondence to help authenticate the document. The document may also include other machine-readable features, such as a bar code, a magnetic stripe, or OCR-B text. These other machine-readable features can likewise convey data that can be cross-checked for expected correspondence with watermark-conveyed data. In one arrangement, four machine-readable features are provided (two watermarks and two others), three of which convey data relating to a passport identifier, and a different three of which convey data relating to a document batch number. Such logical linking between several machine-readable features allows tampering with any feature to be readily detected. A variety of related methods and apparatuses, some involving a third watermark and biometric data, are also detailed. |
申请公布号 |
EP1131769(A2) |
申请公布日期 |
2001.09.12 |
申请号 |
EP19990958983 |
申请日期 |
1999.11.13 |
申请人 |
DIGIMARC CORPORATION |
发明人 |
CARR, JONATHAN, SCOTT;PERRY, BURT, W.;RHOADS, GEOFFREY B. |
分类号 |
B29C45/14;B42D15/00;G06F17/30;G06K1/12;G06K17/00;G06K19/06;G06K19/14;G06T1/00;G07D7/00;G07D7/12;G07F7/08;G10L19/00;H04N1/00;H04N1/32 |
主分类号 |
B29C45/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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