US5555314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fingerprint data processing method
Assignee: Ezel Inc
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Filing: 1994-04-25
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Granted: 1996-09-10
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Expires: 2014-04-25
Abstract
Abstract The present invention provides a method of processing an unknown physical fingerprint for use in a data processing system to verify/identify an unknown fingerprint. The method involves obtaining an unknown fingerprint image that includes images of ridges, binarizing the images of ridges in the unknown fingerprint image, generating an image with fused ridges by expanding the images of ridges in the binarized image, shrinking the image with fused ridges to create a scaled-down image, and masking a first portion of the unknown fingerprint image with the scaled-down image so as to create a modified image of the unknown fingerprint.
Inventors
- 👤 Tatsushi Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:11
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/30; G07C9/32; G07C9/37; G06; G06V; G06V40/00; G06V40/10; G06V40/12; G06V40/1347
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
A method of processing an unknown physical fingerprint comprising: i) obtaining an unknown fingerprint image that includes images of ridges in said unknown physical fingerprint; ii) binarizing said images of ridges in said unknown fingerprint image to produce a binarized image of said ridges; iii) generating an image with fused ridges by expanding said images of ridges in said binarized image of said unknown fingerprint; iv) shrinking said image with fused ridges to create a scaled-down image; and v) masking a first portion of said unknown fingerprint image with said scaled-down image so as to create a modified image of said unknown fingerprint.
Claim 2
Independent Claim
103 words
A method of processing an unknown physical fingerprint comprising: i) obtaining an unknown fingerprint image that includes images of ridges in said unknown physical fingerprint; ii) binarizing said images of ridges in said unknown fingerprint image to produce a binarized image of said ridges; iii) generating an image with fused ridges by expanding said images of ridges in said binarized image of said unknown fingerprint; iv) shrinking said image with fused ridges to create a scaled-down image; and v) masking a first portion of said unknown fingerprint image with said scaled-down image so as to create a modified image of said unknown fingerprint.
Claim 3
Dependent Claim
77 words
A method of processing an unknown fingerprint image as defined in claim 1, wherein said shrinking includes: i) determining a diameter of said unknown fingerprint image and a diameter of said fused image; ii) comparing said diameter of said unknown fingerprint image and said diameter of said fused image; and iii) continuing to shrink said fused image until a predetermined relationship between diameter of said fused image and said diameter of said unknown finger image is reached.
Claim 4
Dependent Claim
46 words
A method of processing an unknown fingerprint image as defined in claim 1, further comprising: i) extracting a second portion of said unknown fingerprint image that was not covered by said scaled-down image during said set of masking a first portion of said unknown fingerprint image.
Claim 5
Dependent Claim
32 words
A method of processing an unknown fingerprint image as defined in claim 3, wherein said second portion of said unknown fingerprint image corresponds to peripheral edge portion of said unknown fingerprint image.
References Cited (Backward Citations)
US4047154A
Cited
US4581760A
Cited
US4607384A
Cited
US4641350A
Cited
US4872203A
Cited
US4827527A
Cited
EP0173972A1
Cited
US4723298A
Cited
WO1987006378A1
Cited
US4817183A
Cited
US5040220A
Cited
US5040224A
Cited
US5054089A
Cited
US5073949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-10 | 2000-03-11 | 2000-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-10 | 2004-03-11 | 2004-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-10 | 2008-03-11 | 2008-09-10 | $7700.00 | Window Closed / Lapsed |