US7130443B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Watermarking
Assignee: British Broadcasting Corp
•
Filing: 2000-03-20
•
Granted: 2006-10-31
•
Expires: 2020-03-20
Abstract
Abstract A watermarking system and method is proposed for still or moving pictures in which a watermark is embedded robustly and simply into DC-values, but without causing unacceptable visible picture degradation. The watermark is secure and can be readily detected, and the method can be used to convey additional data. Also disclosed is a method for watermarking a sequence of pictures in which the visibility of artifacts is reduced. The watermark may carry data and may be used to label a program.
Inventors
- 👤 Oliver Hartwig Werner
- 👤 Andrew James Mason
- 👤 Richard Aubrey Salmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:23
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/46; H04N19/467
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A method of embedding a watermark signal comprising a series of watermark values in a picture signal comprising a series of picture sample values, the method comprising adjusting picture sample values based on watermark values wherein the watermark is derived from a combination of a number of substantially independent watermarks or wherein a number of substantially independent watermarks are embedded in each picture wherein said substantially independent watermarks satisfy the following criteria:— w 2 1 = . . . =w 2 N =1 (1) E[w 1 ]= . . . =E[w N ]=0, where E is the expectation operator (2) E[w k ·w n ]=0 if k≠n (3).
Claim 2
Independent Claim
108 words
A method of embedding a watermark signal comprising a series of watermark values in a picture signal comprising a series of picture sample values, the method comprising adjusting picture sample values based on watermark values wherein the watermark is derived from a combination of a number of substantially independent watermarks or wherein a number of substantially independent watermarks are embedded in each picture wherein said substantially independent watermarks satisfy the following criteria:— w 2 1 = . . . =w 2 N =1 (1) E[w 1 ]= . . . =E[w N ]=0, where E is the expectation operator (2) E[w k ·w n ]=0 if k≠n (3).
Claim 3
Dependent Claim
26 words
A method according to claim 1 , wherein said number of substantially independent watermarks comprises a subset selected from a defined set of substantially independent watermarks.
Claim 4
Dependent Claim
12 words
A method according to claim 2 , wherein said number is three.
Claim 5
Dependent Claim
19 words
A method according to claim 2 , wherein there are more than three substantially independent watermarks in said set.
Claim 6
Dependent Claim
29 words
A method according to claim 1 , wherein the subset is selected or said substantially independent watermarks are selected in dependence on information to be encoded in the picture.
Claim 7
Dependent Claim
41 words
A method according to claim 1 , wherein three bipolar watermarks are combined to produce a single bipolar watermark with the property that the product of the combined watermark with each of the constituent marks has an expectation value of ½.
Claim 8
Dependent Claim
23 words
A method according claim 1 including generating the watermark by convolving a key with a repeated data sequence to produce a data-carrying watermark.
Claim 9
Dependent Claim
27 words
A method according to claim 1 , wherein the picture is divided into two or more sub-pictures, and a substantially independent watermark is embedded into each sub-picture.
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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) | 2009-10-30 | 2010-05-01 | 2010-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-10-30 | 2014-05-01 | 2014-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-10-30 | 2018-05-01 | 2018-10-31 | $7700.00 | Window Closed / Lapsed |