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US 8,023,696 B2Granted
Printing media and methods employing digital watermarking
AssigneeDigimarc Corporation
InventorsGeoffrey B. Rhoads, J. Scott Carr
Life of this patent
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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).
Claims25
A layered physical medium comprising:
- a first exterior face;
- a second exterior face;
- a first layer configured to include a first pattern;
- and
- a second layer configured to include a second pattern, wherein at least one of the patterns encodes machine readable data, and wherein the patterns yield a pattern of contrast that can be sensed by an optical detector from the first or second exterior face of the medium.
2 more elements
A method comprising:
- processing a first layer, wherein the processing yields a first pattern on the first layer;
- processing a second layer, wherein the processing yields a second pattern on the second layer, wherein at least one of the patterns encodes machine readable data;
- and
- combining the first layer and the second layer, wherein the first pattern and the second pattern yield a pattern of contrast.
1 more element
Dependencies are inferred from the claim text.