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
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