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US6636615: Methods and systems using multiple watermarks

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Filing Information

Inventor(s) Geoffrey B. Rhoads · Ammon E. Gustafson ·
Assignee(s) Digimarc Corporation ·
Attorney/Agent(s) William Y. Conwell · Digimarc Corporation ·
Primary Examiner Jayanti K. Patel ·
Application Number US9433104
Filing date 11/03/1999
Issue date 10/21/2003
Predicted expiration date 01/20/2019
U.S. Classifications 382/100  · 713/176  ·
International Classifications --
Kind CodeB1
International Classifications 283 67- 70 · 382100 · 382232 · 382112 · 382115 · 382135 · 382284 · 380 28 · 380 42 · 380232 · 380 54 · 380201 · 380203 · 705 54 · 705 26 · 705 51 · 345630 · 709723 · 709217 · 713176 · 358444 · 358 328 · 250372 · 235380 ·
Related U.S. Application DataRELATED APPLICATIONS
The present application is a continuation in part of application Ser. No. 09/234,780, filed Jan. 20, 1999 (now U.S. Pat. No. 6,332,031), which is a continuation in part of application Ser. No. 60/071,983 filed Jan. 20, 1998.
7 Claims, 6 Drawings


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.

Independent Claims | See all claims (7)

  1. 1. 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.
  2. 2. 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.
  3. 5. 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.
  4. 6. 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.
  5. 7. 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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Patent Family

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US6636615 Digimarc Corporation Geoffrey B. Rhoads et al. Oct 2003