Printing media and methods employing digital watermarking

Details Printing media and methods employing digital watermarking Printing media and methods employing digital watermarking

2006-11-14

2006-11-14

Johns, Andrew W. (Department: 2624)

Image analysis

Applications

C283S072000

Reexamination Certificate

active

07136502

ABSTRACT:
Stationery, or other printable media, is encoded with a digital watermark. The watermark is not conspicuous to a human observer of the media, yet conveys plural bits of auxiliary information when optically scanned and digitally processed. The watermark can be formed by ink-jet printing, or otherwise. The encoded information can be used for various purposes, including authenticating the document as an original, linking to associated on-line resources, and distinguishing seemingly-identical versions of the same document (document serialization).

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