Combined iris imager and wavefront sensor
US8025399B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2008 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Jul 29, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/19
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An iris imaging system used for biometric identification provides a combined iris imager and wavefront sensor. The detector array allows for independent readout of different regions, such that a wavefront sensor region can be read out fast while allowing signal to integrate on the iris imaging region. Alternatively, the entire array may be used for wavefront sensing during an acquisition phase, and then at least a portion of the array may be switched to be used for iris imaging during a subsequent imaging phase. An optical periscope optionally allows various optics to be inserted in front of the combined iris imager and wavefront sensor. In another embodiment, the glint image of an on-axis or near on-axis illumination source is picked off at the image plane and directed to the wavefront sensor optics, while allowing all of the light from the iris field to pass through to the iris imaging camera.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.