Patent US6674886B2 successfully refreshed from Google Patents.
US6674886B2
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Method and system for recognizing security documents
Assignee: Digimarc Corp
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Filing: 1999-10-28
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Granted: 2004-01-06
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Expires: 2019-10-28
Abstract
Abstract A document is analyzed to determine whether it is a banknote or the like, by reference to image data corresponding to the document. Two analysis techniques may be used, one based on detection of a visible pattern characteristic of a security document, the other based on detection of a steganographic digital watermark characteristic of a security document. If either characteristic is found, the image is flagged, and appropriate anti-counterfeiting steps may be taken. Detection of the visible pattern can be performed using a series of successively more rigorous tests. If the image fails a test, successive testing steps can be skipped, speeding the process. Hough transform-based pattern recognition techniques are used in some embodiments. Provision of both a visible pattern detector and a watermark detector in a single apparatus enhances detection reliability, while permitting various implementation efficiencies.
Inventors
- 👤 Bruce L. Davis
- 👤 Burt W. Perry
- 👤 J. Scott Carr
- 👤 Gilbert B. Shaw
- 👤 Geoffrey B. Rhoads
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:32
CPC Classifications
G; G06; G06F; G06F12/00; G06F12/16; H; H04; H04N; H04N1/00; H04N1/00838; H04N1/0084; H04N1/00843; G06F21/00; G06F21/10; G06V; G06V10/00; G06V10/40; G07; G07D; G07D7/00; G07D7/003; G07D7/0034; G07D7/20; H04N1/00856; H04N1/00877; G06F2221/00; G06F2221/21; G06F2221/2101
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
104 words
A method of processing image data to screen for security document images comprising, in the order stated: (a) performing a first analysis on the image data; (b) if the first analysis indicates the image data does not correspond to a security document, skipping steps (c)-(e) (c) performing a second analysis on the image data; (d) if the second image analysis indicates the image data does not correspond to a security document, skipping step (e); and (e) flagging the image data as corresponding to a security document; wherein at least one of the analyses employs a Hough-based transform to detect a two-dimensional, rotationally invariant feature.
Claim 2
Independent Claim
104 words
A method of processing image data to screen for security document images comprising, in the order stated: (a) performing a first analysis on the image data; (b) if the first analysis indicates the image data does not correspond to a security document, skipping steps (c)-(e) (c) performing a second analysis on the image data; (d) if the second image analysis indicates the image data does not correspond to a security document, skipping step (e); and (e) flagging the image data as corresponding to a security document; wherein at least one of the analyses employs a Hough-based transform to detect a two-dimensional, rotationally invariant feature.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the image data is acquired by visible light scanning.
Claim 4
Dependent Claim
49 words
The method of claim 1 in which one of the analyses employs a Hough-based transform to detect a two-dimensional, rotationally invariant feature at a first rotational state, and another of the analyses employs a Hough-based transform to detect a two-dimensional, rotationally invariant feature at a second, different, rotational state.
Claim 5
Independent Claim
97 words
A method of processing image data to screen for security document images comprising, in the order stated: (a) performing a first analysis on the image data; (b) if the first analysis indicates the image data does not correspond to a security document, skipping steps (c)-(e) (c) performing a second analysis on the image data; (d) if the second image analysis indicates the image data does not correspond to a security document, skipping step (e); and (e) flagging the image data as corresponding to a security document; wherein the first analysis is based on a rotationally invariant feature.
Claim 6
Independent Claim
97 words
A method of processing image data to screen for security document images comprising, in the order stated: (a) performing a first analysis on the image data; (b) if the first analysis indicates the image data does not correspond to a security document, skipping steps (c)-(e) (c) performing a second analysis on the image data; (d) if the second image analysis indicates the image data does not correspond to a security document, skipping step (e); and (e) flagging the image data as corresponding to a security document; wherein the first analysis is based on a rotationally invariant feature.
Claim 7
Dependent Claim
15 words
The method of claim 4 wherein the image data is acquired by visible light scanning.
Claim 8
Independent Claim
97 words
A method of processing image data to screen for security document images comprising, in the order stated: (a) performing a first analysis on the image data; (b) if the first analysis indicates the image data does not correspond to a security document, skipping steps (c)-(e) (c) performing a second analysis on the image data; (d) if the second image analysis indicates the image data does not correspond to a security document, skipping step (e); and (e) flagging the image data as corresponding to a security document; wherein the first analysis is based on a rotationally symmetric feature.
Claim 9
Independent Claim
97 words
A method of processing image data to screen for security document images comprising, in the order stated: (a) performing a first analysis on the image data; (b) if the first analysis indicates the image data does not correspond to a security document, skipping steps (c)-(e) (c) performing a second analysis on the image data; (d) if the second image analysis indicates the image data does not correspond to a security document, skipping step (e); and (e) flagging the image data as corresponding to a security document; wherein the first analysis is based on a rotationally symmetric feature.
Claim 10
Dependent Claim
15 words
The method of claim 6 wherein the image data is acquired by visible light scanning.
Claim 11
Independent Claim
100 words
A method of processing image data to screen for security document images comprising, in the order stated: (a) performing a first analysis on the image data; (b) if the first analysis indicates the image data does not correspond to a security document, skipping steps (c)-(e) (c) performing a second analysis on the image data; (d) if the second image analysis indicates the image data does not correspond to a security document, skipping step (e); and (e) flagging the image data as corresponding to a security document; wherein one of said analyses steps through plural rotation states of the image data.
Claim 12
Independent Claim
100 words
A method of processing image data to screen for security document images comprising, in the order stated: (a) performing a first analysis on the image data; (b) if the first analysis indicates the image data does not correspond to a security document, skipping steps (c)-(e) (c) performing a second analysis on the image data; (d) if the second image analysis indicates the image data does not correspond to a security document, skipping step (e); and (e) flagging the image data as corresponding to a security document; wherein one of said analyses steps through plural rotation states of the image data.
References Cited (Backward Citations)
US3069654A
Cited
US4908873A
Cited
US4769850A
Cited
US5652802A
Cited
US5220621A
Cited
US5481377A
Cited
US5586199A
Cited
US5515451A
Cited
US5680223A
Cited
US20020054356A1
Cited
US5629990A
Cited
US5796869A
Cited
WO1995004665A1
Cited
EP0649114B1
Cited
US6091844A
Cited
EP0649114A2
Cited
US5862260A
Cited
US5616905A
Cited
US6345104B1
Cited
US5678155A
Cited
US5568550A
Cited
US5533144A
Cited
US6285776B1
Cited
US5870495A
Cited
US5970165A
Cited
US5706364A
Cited
US5689620A
Cited
US5594809A
Cited
US5710636A
Cited
US5684885A
Cited
US5640647A
Cited
US5668636A
Cited
US5838814A
Cited
EP0789480A2
Cited
US6188787B1
Cited
US6320675B1
Cited
US6181813B1
Cited
US6272245B1
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) | 2007-01-05 | 2007-07-07 | 2008-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-01-05 | 2011-07-07 | 2012-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-01-05 | 2015-07-07 | 2016-01-06 | $7700.00 | Window Closed / Lapsed |