Method and apparatus for encoding paper with information

Details Method and apparatus for encoding paper with information Method and apparatus for encoding paper with information

2006-05-23

2006-05-23

Rogers, Scott A. (Department: 2627)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C382S100000, C382S289000, C358S488000, C283S113000, C235S494000

Reexamination Certificate

active

07050201

ABSTRACT:
Paper is textured with a pattern that yields a known signature signal when transformed to the frequency domain. This signature can be used for various purposes, including determining the angular orientation of the paper when scanned, conveying a plural-bit digital watermark, and for simple document recognition purposes (e.g., photocopiers that refuse to reproduce banknotes). The texturing can be effected during the paper-making process, e.g., by shaping the surface of a de-watering element accordingly.

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