Fingerprint identification system
US5799098A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1997 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | Apr 3, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/37
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a method for comparing one fingerprint to another, there is recorded for each fingerprint the location and angle of minutiae along with a quality measure of each minutiae, and the core and delta location along with the local average image. An image state map defining high quality image areas with and without minutiae and areas of low image quality is also recorded. In matching fingerprints, ridge angle maps are used to align fingerprint images, then state maps are compared, followed by a comparison of minutiae locations. Fingerprints are scored according to closeness of match using a dual hypothesis technique where corresponding areas on file prints and candidate prints are provided with a positive score based when there is correspondence between good quality areas containing minutiae and good quality areas containing no minutiae, and a negative score is generated when minutiae are present in a good quality area in one fingerprint and where no minutiae are present in the corresponding good quality area in the other fingerprint.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.