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 Title: |
US6111978:
System and method for determining ridge counts in fingerprint image processing
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Bolle, Rudolf Maarten; Bedford Hills, NY
Colville, Scott Eric; Madison, WI
Pankanti, Sharathchandra U.; Mt. Kisco, NY
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| Assignee: |
International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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| Published / Filed: |
2000-08-29
/ 1997-04-11
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| Application Number: |
US1997000837069
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| IPC Code: |
Advanced:
G06K 9/00;
Core:
more...
IPC-7:
G06K 9/00;
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| ECLA Code: |
G06K9/00A2;
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| U.S. Class: |
Current:
382/125;
382/124;
382/168;
382/170;
382/173;
382/204;
382/264;
382/266;
382/268;
Original:
382/125;
382/124;
382/168;
382/170;
382/173;
382/204;
382/266;
382/264;
382/268;
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| Field of Search: |
382/124,125,115,116,126,127,173,197,204,266,264,286,227
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| Priority Number: |
| 1997-04-11 |
US1997000837069 |
| 1996-12-13 |
US1996000032713P |
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| Abstract: |
A computer based image processing system uses an extraction process to include a pressure invariant feature for measuring distances between minutiae. The feature extraction process identifies one or more of the following features of the fingerprint: an orthogonal image contrast, a parallel image contrast, and a feature confidence. A ridge counter process, executing on the computer system, determines the number of ridges (ridge count) running across two given points and further qualifies (invalidates) this count if the confidence value of the pixels in the region adjoining the region is not reliable. The ridge count feature between minutiae is used for determining reliable features when matching fingerprints.
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| Attorney, Agent or Firm: |
Percello, Louis J.Perman & Green, LLP ;
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| Primary / Asst. Examiners: |
Kelley, Christopher S.; Chawan, Sheela
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| Maintenance Status: |
E1 Expired Check current status
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Parent Case: |
The present application claims priority to co-pending U.S. provisional application Ser. No. 60/032,713 filed Dec. 13, 1996.
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| Family: |
Show 2 known family members
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First Claim:
Show all 16 claims |
We claim:
1. A computer system for imaging fingerprints, comprising:
- a computer comprising a user interface, a central processing unit (CPU), a data storage that contains a plurality of data records representing one or more fingerprint images and an image capturing subsystem that produces an image of a target fingerprint;
- a feature extractor that produces one or more features from the target image; and
- a distance measuring unit that determines a distance along a path between any two of the features, said distance being determined in units of a number of ridges running between the two features, where the feature extractor further determines a feature confidence of one or more pixels on the path, and where the distance measuring unit is responsive to an occurrence of an invalid pixel on a path between two features for invalidating a distance measurement between the two features.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 6 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other References: |
T. Ruggles, S. Thieme, and D. Elman, "Automated Fingerprint Identification Systems, I. North American Morpho System", Advances in Fingerprint Technology, pp. 212-226, CRC Press, Inc., 1994.
N. K. Ratha, S. Chen and A. K. Jain, "Adaptive Flow Orientation-Based Feature Extraction in Fingerprint Images," Pattern Recognition, vol. 28, No. 11, pp. 1657-1672, 1995.
(16 pages)
Cited by 22 patents
[ISI abstract]
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