Patent US6181813B1 successfully refreshed from Google Patents.
US6181813B1
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US
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Method for counterfeit currency detection using orthogonal line comparison
Assignee: Xerox Corp
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Filing: 1997-09-29
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Granted: 2001-01-30
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Expires: 2017-09-29
Abstract
Abstract An anti-counterfeit currency detection method is disclosed wherein local edge information is utilized for accurately detecting lines and curves of legitimate notes. The method can more accurately determine the location and orientation of a pattern and thus provides more reliable currency detection. A detector is trained off-line with example notes resulting in a stored template generated by recording a test pattern similar to a pattern to be tested; anchor lines are identified within said template which are further represented in subsequent test patterns. The template is rotated and shifted before matching it to the test pattern so that anchor lines align with long lines detected within the test pattern. The template and test pattern are then compared to determine whether there is a match. The system comprises a microprocessor is programmed to facilitate the training of a detector off-line with example notes which are scanned into said system wherein a template is generated by recording an image pattern of said example notes similar to a test pattern to be detected. The microprocessor identifies anchor lines within the template which are further represented in said test pattern; rotates and shifts the template before matching it to the test pattern so that anchor lines align with lines which may be detected within said test pattern; and compares the template to the test pattern to determine whether said anchor lines exist within said test pattern.
Inventors
- 👤 Zhigang Fan
- 👤 John W. Wu
- 👤 Felice A. Micco
- 👤 Mike C. Chen
- 👤 Kien A. Phong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:18
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/20; G06V10/24; G06V10/245; G06V10/32
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
A counterfeit currency detection method using line detection information for determining location and orientation of a predetermined image pattern for matching against a test pattern to be authenticated, comprising the steps of: training a detector off-line with at least one example currency note wherein at least one template is generated thereby; identifying at least 1 pair of anchor lines within said generated template wherein each pair of anchor lines contain at least 2 orthogonal lines, said identifying step using edge detection and algorithmic transforms; rotating and shifting said template so that said anchor lines align with lines detected within said test pattern; and comparing said template to said test pattern to determine whether said anchor lines exist within said test pattern.
Claim 2
Dependent Claim
121 words
A counterfeit currency detection method using line detection information for determining location and orientation of a predetermined image pattern for matching against a test pattern to be authenticated, comprising the steps of: training a detector off-line with at least one example currency note wherein at least one template is generated thereby; identifying at least 1 pair of anchor lines within said generated template wherein each pair of anchor lines contain at least 2 orthogonal lines, said identifying step using edge detection and algorithmic transforms; rotating and shifting said template so that said anchor lines align with lines detected within said test pattern; and comparing said template to said test pattern to determine whether said anchor lines exist within said test pattern.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said anchor lines may comprise straight lines representing edges within said test pattern.
Claim 4
Dependent Claim
165 words
A counterfeit detection system comprising a microprocessor programmed to: facilitate the training of a detector off-line with authentic currency documents which are scanned into said system wherein a plurality of templates are generated by recording an image pattern within said authentic currency documents resulting in at least one template wherein said at least one template is stored in a memory; identify at least 1 pair of anchor lines within said at least one template wherein each pair of anchor lines contain at least 2 orthogonal lines, said identifying step using edge detection and algorithmic transforms; rotate and shift said at least one template during counterfeit detection operations wherein matching of said at least one template to a scanned test pattern is facilitated so that said anchor lines align with similar lines which may be detected within said test pattern, thereby resulting in alignment; and comparing said at least one template to said test pattern to determine whether said anchor lines exist within said test pattern.
Claim 5
Dependent Claim
165 words
A counterfeit detection system comprising a microprocessor programmed to: facilitate the training of a detector off-line with authentic currency documents which are scanned into said system wherein a plurality of templates are generated by recording an image pattern within said authentic currency documents resulting in at least one template wherein said at least one template is stored in a memory; identify at least 1 pair of anchor lines within said at least one template wherein each pair of anchor lines contain at least 2 orthogonal lines, said identifying step using edge detection and algorithmic transforms; rotate and shift said at least one template during counterfeit detection operations wherein matching of said at least one template to a scanned test pattern is facilitated so that said anchor lines align with similar lines which may be detected within said test pattern, thereby resulting in alignment; and comparing said at least one template to said test pattern to determine whether said anchor lines exist within said test pattern.
Claim 6
Dependent Claim
13 words
The invention of claim 3 further comprising a memory for storing said templates.
Claim 7
Dependent Claim
15 words
The invention of claim 3 further comprising a scanner for scanning images into said system.
Claim 8
Dependent Claim
22 words
The invention of claim 3 further comprising a indicator means for indicating whether said test pattern is counterfeit based on said comparing.
Claim 9
Dependent Claim
23 words
The invention of claim 6 wherein said indicator means provides input to a controller that prevents photocopying or storage of said test pattern.
Claim 10
Dependent Claim
15 words
The invention of claim 4 further comprising a scanner for scanning images into said system.
Claim 11
Dependent Claim
22 words
The invention of claim 8 further comprising a indicator means for indicating whether said test pattern is counterfeit based on said comparing.
Claim 12
Dependent Claim
23 words
The invention of claim 9 wherein said indicator means provides input to a controller that prevents photocopying or storage of said test pattern.
References Cited (Backward Citations)
US4153897A
Cited
US4594674A
Cited
US4922543A
Cited
US5216724A
Cited
US5867589A
Cited
US5220398A
Cited
US5430525A
Cited
US5287415A
Cited
US5363949A
Cited
US5437897A
Cited
US5652803A
Cited
US5659628A
Cited
US5790165A
Cited
US5557412A
Cited
US5253765A
Cited
US5731880A
Cited
US5291243A
Cited
US5909313A
Cited
US5845008A
Cited
US5678155A
Cited
US5530772A
Cited
US5781653A
Cited
US5533144A
Cited
US5528387A
Cited
US6014453A
Cited
US5859651A
Cited
US6026186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-01-30 | 2004-07-31 | 2005-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-30 | 2008-07-31 | 2009-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-30 | 2012-07-31 | 2013-01-30 | $7700.00 | Window Closed / Lapsed |