Image analysis – Applications
Reexamination Certificate
2005-11-29
2005-11-29
Johns, Andrew W. (Department: 2621)
Image analysis
Applications
C358S003280, C030S002000, C713S176000, C283S072000
Reexamination Certificate
active
06970573
ABSTRACT:
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.
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Carr Jonathan Scott
Perry Burt W.
Rhoads Geoffrey B.
Digimarc Corporation
Digimarc Corporation
Johns Andrew W.
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