US6636615B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and systems using multiple watermarks
Assignee: Digimarc Corp
•
Filing: 1999-11-03
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Granted: 2003-10-21
•
Expires: 2019-11-03
Abstract
Abstract Two or more digital watermarks, with different characteristics, are embedded in a document. The characteristics are chosen so that the watermarks will be affected in different manners if the document is subsequently copied or reproduced. The detection process or mechanism reads two or more of the watermarks and compares their characteristics. While wear and handling may change the characteristics of the digital watermarks in a document, the relationship between the characteristics of the multiple digital watermarks in a document will nevertheless give an indication as to whether a document is an original or a copy of an original. Document wear can be independently assessed and used as an aid in interpreting the detected watermark characteristics.
Inventors
- 👤 Geoffrey B. Rhoads
- 👤 Ammon E. Gustafson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:16
CPC Classifications
G; G06; G06T; G06T7/00; G06T7/0002; G06T1/00; G06T1/0021; G06T1/005; G06T1/0071; G06T7/0004; G07; G07C; G07C9/00; G07C9/20; G07C9/22; G07C9/25; G07C9/253; G07F; G07F7/00; G07F7/08; G07F7/086; G07F7/12; G10; G10L; G10L19/00; G10L19/018; H; H04; H04N; H04N1/00; H04N1/00002; H04N1/00005; H04N1/00026; H04N1/00037; H04N1/00092; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32288; H04N1/32304; H04N1/32309; G06T2201/00; G06T2201/005; G06T2201/0052; G06T2207/00; G06T2207/30; G06T2207/30108; G06T2207/30144; G11; G11B; G11B20/00; G11B20/00086
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
A method comprising: sensing a first parameter related to a first digital watermark in a document; sensing a second parameter related to a second digital watermark in the document; sensing a third parameter related to wear of the document; and by reference to said first, second and third parameters, assessing whether the document is likely an original document.
Claim 2
Independent Claim
58 words
A method comprising: sensing a first parameter related to a first digital watermark in a document; sensing a second parameter related to a second digital watermark in the document; sensing a third parameter related to wear of the document; and by reference to said first, second and third parameters, assessing whether the document is likely an original document.
Claim 3
Dependent Claim
41 words
A document including a substrate with printing thereon, the printing comprising at least first and second steganographic watermarks, wherein the first and second steganographic watermarks are designed to change differently when the document is subjected to first and second corruption processes.
Claim 4
Dependent Claim
41 words
A document including a substrate with printing thereon, the printing comprising at least first and second steganographic watermarks, wherein the first and second steganographic watermarks are designed to change differently when the document is subjected to first and second corruption processes.
Claim 5
Dependent Claim
31 words
The document of claim 2 where the document is one of the group consisting of a product label, a product tag, product packaging, a banknote, a coupon, and a food stamp.
Claim 6
Dependent Claim
22 words
The document of claim 2 in which the first corruption process includes wear, and the second corruption process includes scanning and printing.
Claim 7
Independent Claim
67 words
A method comprising: sensing a first parameter related to a first digital watermark from a document; sensing a second parameter related to a second digital watermark from the document; and by reference to at least the first and second parameters, assessing whether the document is likely an original document, wherein the first and second digital watermarks are designed to change differently when subjected to a corruption process.
Claim 8
Independent Claim
67 words
A method comprising: sensing a first parameter related to a first digital watermark from a document; sensing a second parameter related to a second digital watermark from the document; and by reference to at least the first and second parameters, assessing whether the document is likely an original document, wherein the first and second digital watermarks are designed to change differently when subjected to a corruption process.
Claim 9
Independent Claim
80 words
A method comprising: sensing a first parameter related to a first digital watermark from a document; sensing a second parameter related to a second digital watermark from the document; sensing a third parameter related to wear of the document; and by reference to said first, second and third parameters, assessing whether the document is likely an original document, wherein sensing of the first and second parameters comprises visible light scanning of the document to retrieve the first and second parameters.
Claim 10
Independent Claim
80 words
A method comprising: sensing a first parameter related to a first digital watermark from a document; sensing a second parameter related to a second digital watermark from the document; sensing a third parameter related to wear of the document; and by reference to said first, second and third parameters, assessing whether the document is likely an original document, wherein sensing of the first and second parameters comprises visible light scanning of the document to retrieve the first and second parameters.
Claim 11
Independent Claim
79 words
A method comprising: sensing a first parameter related to a first digital watermark from a document; sensing a second parameter related to a second digital watermark from the document; and by reference to at least the first and second parameters, assessing whether the document is likely an original document, wherein the first digital watermark comprises a relatively higher likelihood of withstanding a corruption operation, while the second digital watermark comprises a relatively lower likelihood of withstanding the corruption operation.
Claim 12
Independent Claim
79 words
A method comprising: sensing a first parameter related to a first digital watermark from a document; sensing a second parameter related to a second digital watermark from the document; and by reference to at least the first and second parameters, assessing whether the document is likely an original document, wherein the first digital watermark comprises a relatively higher likelihood of withstanding a corruption operation, while the second digital watermark comprises a relatively lower likelihood of withstanding the corruption operation.
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