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US6704869B2
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Extracting digital watermarks using logarithmic sampling and symmetrical attributes
Assignee: Digimarc Corp
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Filing: 2002-07-22
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Granted: 2004-03-09
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Expires: 2022-07-22
Abstract
Abstract A digital watermark reader performs a logarithmic sampling of a watermarked media signal to produce a sampled signal. It then analyzes the sampled signal to detect attributes associated with a watermark signal. It extracts a digital watermark based on detected attributes associated with the watermark signal. As an alternative or in addition to these operations, the watermark reader performs a polar sampling of the media signal. For example, polar sampling may be used to address rotational distortion. Another digital watermark reader transforms the media signal to a transform domain, and analyzes the transformed media signal to detect a symmetrical attribute associated with a watermark signal. The method extracts the digital watermark based on detected attributes associated with the watermark signal.
Inventors
- 👤 Geoffrey B. Rhoads
- 👤 Ravi K. Sharma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:51
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/80; H04N21/83; H04N21/835; H04N21/8358; G; G06; G06T; G06T1/00; G06T1/0021; G06T1/005; G06T1/0064; G06V; G06V30/00; G06V30/40; G10; G10L; G10L19/00; G10L19/018; H04N1/00; H04N1/00002; H04N1/00005; H04N1/00026; H04N1/00037; H04N1/00071; H04N1/00074; H04N1/00079; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32154; H04N1/3216; H04N1/3232; H04N1/32352; H04N21/20; H04N21/23; H04N21/238; H04N21/2389; H04N21/23892; G06T2201/00; G06T2201/005; G06T2201/0051; G06T2201/0052; H04N1/32106; H04N1/32122; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3204; H04N2201/3205; H04N2201/3207; H04N2201/3225; H04N2201/3226; H04N2201/3233; H04N2201/3269; H04N2201/327; H04N2201/3271; H04N2201/3274; H04N2201/328
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
51 words
A method of extracting a digital watermark in a media signal comprising: performing a logarithmic sampling of the media signal to produce a sampled signal; analyzing the sampled signal to detect attributes associated with a watermark signal; and extracting the digital watermark based on detected attributes associated with the watermark signal.
Claim 2
Independent Claim
51 words
A method of extracting a digital watermark in a media signal comprising: performing a logarithmic sampling of the media signal to produce a sampled signal; analyzing the sampled signal to detect attributes associated with a watermark signal; and extracting the digital watermark based on detected attributes associated with the watermark signal.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the logarithmic sampling is performed on a transform domain representation of the media signal.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein the attributes have pseudorandom properties.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the logarithmic sampling is performed in two dimensions.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the attributes include a symmetrical attribute.
Claim 7
Dependent Claim
17 words
A computer readable medium on which is stored instructions for performing the method of claim 1 .
Claim 8
Independent Claim
51 words
A method of extracting a digital watermark in an audio signal comprising: performing a logarithmic sampling of the media signal to produce a sampled signal; analyzing the sampled signal to detect attributes associated with a watermark signal; and extracting the digital watermark based on detected attributes associated with the watermark signal.
Claim 9
Independent Claim
51 words
A method of extracting a digital watermark in an audio signal comprising: performing a logarithmic sampling of the media signal to produce a sampled signal; analyzing the sampled signal to detect attributes associated with a watermark signal; and extracting the digital watermark based on detected attributes associated with the watermark signal.
Claim 10
Dependent Claim
20 words
The method of claim 7 wherein the logarithmic sampling is performed on a transform domain representation of the audio signal.
Claim 11
Dependent Claim
19 words
The method of claim 8 wherein the transform domain representation comprises a frequency domain representation of the audio signal.
Claim 12
Dependent Claim
11 words
The method of claim 7 wherein the attributes include pseudorandom properties.
Claim 13
Dependent Claim
12 words
The method of claim 7 wherein the analyzing includes performing phase matching.
Claim 14
Dependent Claim
11 words
The method of claim 7 wherein the analyzing includes performing correlation.
Claim 15
Dependent Claim
12 words
The method of claim 7 wherein the attributes include a symmetrical attribute.
Claim 16
Dependent Claim
17 words
A computer readable medium on which is stored instructions for performing the method of claim 7 .
Claim 17
Independent Claim
51 words
A method of extracting a digital watermark in an image signal comprising: performing a polar sampling of the video signal to produce a sampled signal; analyzing the sampled signal to detect attributes associated with a watermark signal; and extracting the digital watermark based on detected attributes associated with the watermark signal.
Claim 18
Independent Claim
51 words
A method of extracting a digital watermark in an image signal comprising: performing a polar sampling of the video signal to produce a sampled signal; analyzing the sampled signal to detect attributes associated with a watermark signal; and extracting the digital watermark based on detected attributes associated with the watermark signal.
Claim 19
Dependent Claim
20 words
The method of claim 15 wherein the polar sampling is performed on a transform domain representation of the media signal.
Claim 20
Dependent Claim
13 words
The method of claim 15 wherein the image signal comprises a video signal.
Claim 21
Dependent Claim
16 words
The method of claim 15 wherein the analyzing includes searching for a matching watermark signal pattern.
Claim 22
Dependent Claim
11 words
The method of claim 15 wherein the attributes include pseudorandom attributes.
Claim 23
Dependent Claim
12 words
The method of claim 15 wherein the attributes include a symmetrical attribute.
Claim 24
Dependent Claim
17 words
A computer readable medium on which is stored instructions for performing the method of claim 15 .
Claim 25
Independent Claim
49 words
A method of extracting a digital watermark in a media signal comprising: transforming the media signal to a transform domain; analyzing the transformed media signal to detect a symmetrical attribute associated with a watermark signal; and extracting the digital watermark based on detected attributes associated with the watermark signal.
Claim 26
Independent Claim
49 words
A method of extracting a digital watermark in a media signal comprising: transforming the media signal to a transform domain; analyzing the transformed media signal to detect a symmetrical attribute associated with a watermark signal; and extracting the digital watermark based on detected attributes associated with the watermark signal.
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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) | 2007-03-09 | 2007-09-08 | 2008-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-03-09 | 2011-09-08 | 2012-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-03-09 | 2015-09-08 | 2016-03-09 | $7700.00 | Window Closed / Lapsed |