US6137892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data hiding based on neighborhood attributes
Assignee: Digimarc Corp
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Filing: 1999-11-03
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Granted: 2000-10-24
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Expires: 2019-11-03
Abstract
Abstract Plural-bit data is encoded in an image without leaving apparent evidence of image alteration. The image is represented by data elements (e.g., pixels) whose values are changed to effect the encoding. The particular data elements to be changed are selected not on their individual values, but rather on an attribute of a neighboring group of data elements.
Inventors
- 👤 Robert D. Powell
- 👤 Mark J. Nitzberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:57
CPC Classifications
G; G06; G06T; G06T1/00; G06T1/0021; G06T1/005; G06T1/0064; G06Q; G06Q20/00; G06Q20/30; G06Q20/34; G06Q20/341; G06T1/0028; G07; G07D; G07D7/00; G07D7/004; G07D7/0047; G07D7/005; G07D7/0054; G07D7/0056; G07D7/06; G07D7/12; G07D7/20; G07D7/2008; G07D7/202; G07D7/2033; G07F; G07F7/00; G07F7/08; G07F7/12; H; H04; H04N; H04N1/00; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32203; H04N1/32208; H04N1/32229; H04N1/32245; H04N1/32251; H04N1/32288; H04N1/3232; G06T2201/00; G06T2201/005; G06T2201/0051; G06T2201/0081; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233; H04N2201/3235; H04N2201/3269; H04N2201/327
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
A method of marking a work of authorship to encode a plural-bit code therein, the work being represented as a set of plural data elements, the method including selecting data elements to be changed to effect said marking based not just on the values of individual data elements, but on an attribute of a neighborhood of data elements, said neighborhood being comprised of data elements having substantially non-uniform values.
Claim 2
Independent Claim
69 words
A method of marking a work of authorship to encode a plural-bit code therein, the work being represented as a set of plural data elements, the method including selecting data elements to be changed to effect said marking based not just on the values of individual data elements, but on an attribute of a neighborhood of data elements, said neighborhood being comprised of data elements having substantially non-uniform values.
Claim 3
Dependent Claim
19 words
The method of claim 1 in which said attribute is a local extrema in values of said individual elements.
Claim 4
Dependent Claim
12 words
The method of claim 1 in which the work comprises an image.
Claim 5
Dependent Claim
11 words
The method of claim 3 in which the image comprises pixels.
Claim 6
Dependent Claim
24 words
The method of claim 1 that includes increasing the value of a first data element, and decreasing the value of a second data element.
Claim 7
Dependent Claim
32 words
The method of claim 5 that includes increasing the values of other data elements adjoining the first data element, and reducing the values of other data elements adjoining the second data element.
Claim 8
Dependent Claim
21 words
The method of claim 1 that includes changing said selected data elements based, at least in part, on initial values thereof.
Claim 9
Dependent Claim
20 words
The method of claim 1 that includes changing the values of the selected data elements by ten percent or less.
Claim 10
Dependent Claim
26 words
The method of claim 1 wherein at least certain excerpts of the work are not marked because marking in such excerpts would more likely be conspicuous.
Claim 11
Dependent Claim
19 words
The method of claim 1 wherein each changed element corresponds to a single bit, only, of the plural-bit code.
Claim 12
Dependent Claim
19 words
The method of claim 10 wherein plural changed elements each correspond to a single bit of the plural-bit code.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-10-24 | 2004-04-24 | 2004-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-24 | 2008-04-24 | 2008-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-24 | 2012-04-24 | 2012-10-24 | $7700.00 | Window Closed / Lapsed |