System and method for illuminating and imaging the iris of a person
US8254768B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Aug 8, 2011 |
| Grant date | Aug 28, 2012 |
| Priority date | — |
| Expiry date | Aug 8, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F18/254
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method for capturing an image of one or both irises. To image an iris, a person stands or moves in a target zone. A flash element provides an incoherent flash of light through an aperture. The flash is filtered to produce filtered light. The filtered light has primary wavelengths in the far red and near infrared portions of the spectrum. The filtered light is not perceived well by the human eye due to short duration, NIR color and small size. The intensity of the filtered light at the target area surpasses the intensity of all ambient light. In this manner, a person's face in the target area will always be properly illuminated, even if that person were backlit by full sunlight. An image of the person's face is taken with a camera. The image of the face is analyzed to obtain any iris pattern information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.