US7181042B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital authentication with digital and analog documents
Assignee: Digimarc Corp
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Filing: 2003-10-09
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Granted: 2007-02-20
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Expires: 2023-10-09
Abstract
Abstract A watermark embedder transforms a media signal from its perceptual domain to frequency domain regions and embeds a hash of data from one frequency domain region into a watermark in another frequency domain region. Alternatively, it encodes instances of the same message into the frequency domain regions. To detect alteration of the media signal, a watermark decoder transforms a suspect signal into the frequency domain regions, extracts the watermark message from a first frequency domain region and compares it with a reference derived from another frequency domain region. The reference signal is either a hash computed from the other frequency domain region of the watermarked signal, or another instance of the same message embedded into the other frequency domain region. The decoder can be used to detect alteration of the signal, such as alteration that occurs with reproduction (printing, scanning, copying, D/A-A/D conversion, etc.), compression, cropping or swapping of media signal content, etc.
Inventors
- 👤 Jun Tian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:21
CPC Classifications
G; G06; G06T; G06T1/00; G06T1/0021; G06T1/0028; H; H04; H04N; H04N1/00; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32154; H04N1/3217; H04N1/32187; H04N1/32267; H04N1/32283; H04N1/3232; H04N1/32331; H04N1/32352; G06T2201/00; G06T2201/005; G06T2201/0052; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233; H04N2201/3236; H04N2201/3269; H04N2201/327; H04N2201/328; H04N2201/3284
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
70 words
Apparatus which authenticates a digital representation of an object, the digital representation including frequency components and the apparatus comprising: an apparatus component which uses first information in at least a first frequency component of the frequency components to produce first authentication information; and an incorporator which incorporates the first authentication information into at least a second frequency component of the frequency components that is separate from the first frequency component.
Claim 2
Dependent Claim
70 words
Apparatus which authenticates a digital representation of an object, the digital representation including frequency components and the apparatus comprising: an apparatus component which uses first information in at least a first frequency component of the frequency components to produce first authentication information; and an incorporator which incorporates the first authentication information into at least a second frequency component of the frequency components that is separate from the first frequency component.
Claim 3
Dependent Claim
26 words
The apparatus set forth in claim 1 wherein: the frequency components are coefficient values that represent significant frequency components that are computed by a perception model.
Claim 4
Dependent Claim
16 words
The apparatus set forth in claim 2 wherein: the perception model is an auditory perception model.
Claim 5
Dependent Claim
16 words
The apparatus set forth in claim 2 wherein: the perception model is a visual perception model.
Claim 6
Dependent Claim
16 words
The apparatus set forth in claim 1 wherein: the frequency components are contained in DCT blocks.
Claim 7
Dependent Claim
16 words
The apparatus set forth in claim 1 wherein: the first authentication information is a digital signature.
Claim 8
Dependent Claim
17 words
The apparatus set forth in claim 1 wherein: the first authentication information is a secure hash code.
Claim 9
Dependent Claim
16 words
The apparatus set forth in claim 1 wherein: the first authentication information is a cryptographic code.
Claim 10
Dependent Claim
16 words
The apparatus set forth in claim 1 wherein: the first authentication information is a hash code.
Claim 11
Dependent Claim
16 words
The apparatus of claim 1 wherein the apparatus component comprises instructions executed by electronic processing circuitry.
Claim 12
Dependent Claim
15 words
The apparatus of claim 1 wherein the apparatus component comprises at least electronic processing circuitry.
Claim 13
Dependent Claim
35 words
The apparatus of claim 1 wherein the apparatus component comprises at least a machine-readable medium comprising instructions stored thereon to use the first information in the first frequency components to produce the first authentication information.
Claim 14
Dependent Claim
37 words
The apparatus of claim 1 wherein the apparatus component comprises at least one component from a group comprising at least firmware, hardware, instructions executing on digital circuitry, and a computer readable medium comprising executable instructions stored thereon.
Claim 15
Independent Claim
69 words
A method comprising: receiving digital data representing an object, wherein the digital data comprises a plurality of frequency components; producing first authentication information from at least a first frequency component of the plurality of frequency components; and incorporating the first authentication information into at least a second frequency component of the plurality of frequency components, wherein the second frequency component and the first frequency component are separate frequency components.
Claim 16
Independent Claim
69 words
A method comprising: receiving digital data representing an object, wherein the digital data comprises a plurality of frequency components; producing first authentication information from at least a first frequency component of the plurality of frequency components; and incorporating the first authentication information into at least a second frequency component of the plurality of frequency components, wherein the second frequency component and the first frequency component are separate frequency components.
Claim 17
Dependent Claim
14 words
The method of claim 14 where the first authentication information comprises a digital signature.
Claim 18
Dependent Claim
15 words
The method of claim 14 where the first authentication information comprises a secure hash code.
Claim 19
Dependent Claim
14 words
The method of claim 14 where the first authentication information comprises a cryptographic code.
Claim 20
Dependent Claim
14 words
The method of claim 14 where the first authentication information comprises a hash code.
Claim 21
Dependent Claim
13 words
A machine-readable medium comprising instructions to execute the method of claim 14 .
Claim 22
Dependent Claim
24 words
The method of claim 14 where the frequency components are coefficient values that represent significant frequency components that are computed by a perception model.
Claim 23
Dependent Claim
14 words
The method of claim 20 where the perception model is an auditory perception model.
Claim 24
Dependent Claim
14 words
The method of claim 20 where the perception model is a visual perception model.
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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) | 2010-02-19 | 2010-08-21 | 2011-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2014-02-19 | 2014-08-21 | 2015-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2018-02-19 | 2018-08-21 | 2019-02-20 | $7700.00 | Window Closed / Lapsed |