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US5933798A
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Detecting a watermark embedded in an information signal
Assignee: Civolution BV
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Filing: 1997-07-16
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Granted: 1999-08-03
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Expires: 2017-07-16
Abstract
Abstract To detect a watermark signal embedded within an information signal, predictive filtering is applied to either the information signal, a plurality of applied watermark signals, or both types of signals. After the filtering, a correlation is determined between the information signal and the watermark signals. The amount of the correlation is indicative of whether a particular watermark is embedded within the information signal.
Inventors
- 👤 Johan P. M. G. Linnartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:36
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/08; G; G06; G06T; G06T1/00; G06T1/0021; G06T1/005; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2389; H04N21/23892; H04N21/80; H04N21/83; H04N21/835; H04N21/8358; H04N5/00; H04N5/76; H04N5/91; H04N5/913; H04N7/24; H04N7/52; G06T2201/00; G06T2201/005; G06T2201/0065; H04N2005/91307; H04N2005/91335
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
50 words
A method of detecting a watermark signal embedded in an information signal, comprising the steps of: providing an applied watermark signal: predictive filtering of the information signal or the applied watermark signal or both; correlating the information signal and the applied watermark signal; and evaluating the result of said correlation.
Claim 2
Independent Claim
50 words
A method of detecting a watermark signal embedded in an information signal, comprising the steps of: providing an applied watermark signal: predictive filtering of the information signal or the applied watermark signal or both; correlating the information signal and the applied watermark signal; and evaluating the result of said correlation.
Claim 3
Dependent Claim
19 words
The method of claim 1, wherein the predictive filtering is adapted to predetermined statistical properties of the information signal.
Claim 4
Dependent Claim
25 words
The method of claim 1, wherein both the information signal and applied watermark signal are predictive filtered and the predictive filter steps are the same.
Claim 5
Independent Claim
47 words
A method of detecting a watermark embedded in an information signal, comprising the steps of: filtering the information signal using filter coefficients determined by an applied watermark signal, and by a model of the statistical properties of the information signal: and evaluating the result of said filtering.
Claim 6
Independent Claim
47 words
A method of detecting a watermark embedded in an information signal, comprising the steps of: filtering the information signal using filter coefficients determined by an applied watermark signal, and by a model of the statistical properties of the information signal: and evaluating the result of said filtering.
Claim 7
Dependent Claim
72 words
An arrangement for detecting a watermark signal embedded in an information signal, comprising: correlation means for correlating the information signal and an applied watermark signal and: evaluation means for evaluating the result of said correlation, communicating with the correlation means; and a predictive filter for filtering the information signal or for filtering the applied watermark, or both, and connected for applying the filtered signal and the filtered watermark to the correlation means.
Claim 8
Dependent Claim
72 words
An arrangement for detecting a watermark signal embedded in an information signal, comprising: correlation means for correlating the information signal and an applied watermark signal and: evaluation means for evaluating the result of said correlation, communicating with the correlation means; and a predictive filter for filtering the information signal or for filtering the applied watermark, or both, and connected for applying the filtered signal and the filtered watermark to the correlation means.
Claim 9
Dependent Claim
22 words
The arrangement of claim 5, wherein the predictive filter includes means to filter depending on predetermined statistical properties of the information signal.
Claim 10
Dependent Claim
36 words
The arrangement of claim 5, wherein the predictive filter includes a first predictive filter for filtering the information signal and a second predictive filter for filtering the applied water mark and both predictive filters are identical.
Claim 11
Dependent Claim
56 words
An arrangement for detecting a watermark signal embedded in an information signal, comprising: a filter for filtering said information signal using filter coefficients: calculation means for calculating said filter coefficients in dependence on an applied watermark and a model of the statistical properties of the information signal; and means for evaluating the result of said filtering.
Claim 12
Dependent Claim
56 words
An arrangement for detecting a watermark signal embedded in an information signal, comprising: a filter for filtering said information signal using filter coefficients: calculation means for calculating said filter coefficients in dependence on an applied watermark and a model of the statistical properties of the information signal; and means for evaluating the result of said filtering.
References Cited (Backward Citations)
US5664018A
Cited
WO1998002864A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2002-08-02 | 2003-02-01 | 2003-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-02 | 2007-02-01 | 2007-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-02 | 2011-02-01 | 2011-08-03 | $7700.00 | Window Closed / Lapsed |