Method of extracting iris region and individual identification device
US6614919B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1999 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Dec 22, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/1171
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An individual identification device and a method for extracting an iris region which can extract the iris region with high accuracy even if the shape of a pupil is not circular as in the case of a horse, cattle or the like. Contour lines of the pupil and an granula iridia are extracted from an image inputted. Part of a circle is applied to a contour line of the pupil and a radius of the contour line outside the iris region is estimated by an angle formed by two lines, one to connect both ends of the pupil and the other to pass the center of the circle. An iris circle is estimated by applying part of the circle to the contour line inside and outside the iris region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.