Scale-invariant, resolution-invariant iris imaging using reflection from the eye
US8243133B1 · kind B1 · utility
60Cited by
3References
17Claims
0Family size
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Key dates
| Filing date | Jun 29, 2009 |
| Grant date | Aug 14, 2012 |
| Priority date | — |
| Expiry date | Sep 3, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/19
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical system includes an active focus element that maintains an image in focus over a range of object distances. The active focus element and aperture stop are positioned such that the image scale and the image spatial resolution are also invariant (or at least have a reduced sensitivity) with respect to object distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.