CA2304041A1 - Method for image processing to facilitate copy protection - Google Patents

Method for image processing to facilitate copy protection Download PDF

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Publication number
CA2304041A1
CA2304041A1 CA002304041A CA2304041A CA2304041A1 CA 2304041 A1 CA2304041 A1 CA 2304041A1 CA 002304041 A CA002304041 A CA 002304041A CA 2304041 A CA2304041 A CA 2304041A CA 2304041 A1 CA2304041 A1 CA 2304041A1
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CA
Canada
Prior art keywords
work
copy protection
string
image processing
algorithm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002304041A
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French (fr)
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CA2304041C (en
Inventor
F. Thomson Leighton
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Publication of CA2304041A1 publication Critical patent/CA2304041A1/en
Application granted granted Critical
Publication of CA2304041C publication Critical patent/CA2304041C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/0021—Image watermarking
    • G06T1/005—Robust watermarking, e.g. average attack or collusion attack resistant
    • G06T1/0078—Robust watermarking, e.g. average attack or collusion attack resistant using multiple thresholds

Abstract

A method for mapping a work (e.g., a picture, a document or the like) comprising a large number of bytes into a relatively small bit string to facilitate copy protection. The technique creates a first string from the work with the property that if one modifies the work by some given degree (e.g., through intentional variation or perhaps merely through aging), a second string (generated by the inventive technique) and associated with the modified work is not meaningfully distinct from the first string. When applied through the algorithm, works that are similar result in the same or similar strings. As a result, an owner of the content sought to be protected may apply the algorithm to copies of the work for copy protection purposes.
CA002304041A 1998-07-17 1999-07-19 Method for image processing to facilitate copy protection Expired - Lifetime CA2304041C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US12002398A 1998-07-17 1998-07-17
US09/120,023 1998-07-17
PCT/US1999/016515 WO2000004422A2 (en) 1998-07-17 1999-07-19 Method for image processing to facilitate copy protection

Publications (2)

Publication Number Publication Date
CA2304041A1 true CA2304041A1 (en) 2000-01-27
CA2304041C CA2304041C (en) 2004-06-01

Family

ID=22387830

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002304041A Expired - Lifetime CA2304041C (en) 1998-07-17 1999-07-19 Method for image processing to facilitate copy protection

Country Status (3)

Country Link
AU (1) AU5318999A (en)
CA (1) CA2304041C (en)
WO (1) WO2000004422A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108205810A (en) * 2016-12-16 2018-06-26 富士通株式会社 Image comparison means and method, electronic equipment

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US5915027A (en) * 1996-11-05 1999-06-22 Nec Research Institute Digital watermarking
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108205810A (en) * 2016-12-16 2018-06-26 富士通株式会社 Image comparison means and method, electronic equipment

Also Published As

Publication number Publication date
WO2000004422A2 (en) 2000-01-27
WO2000004422A3 (en) 2000-04-20
CA2304041C (en) 2004-06-01
AU5318999A (en) 2000-02-07

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