Printing media and methods employing digital watermarking
First Claim
Patent Images
1. 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.
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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).
27 Citations
25 Claims
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1. A layered physical medium comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification