Systems and methods for minimizing aberrating effects in imaging systems
US7889903B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2008 |
| Grant date | Feb 15, 2011 |
| Priority date | — |
| Expiry date | Nov 7, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A biometric optical recognition system includes optics, including a wavefront coding mask, for imaging a wavefront of object to be recognized to an intermediate image, and a detector for detecting the intermediate image. A modulation transfer function detected by the detector contains no zeros such that subsequent task based image processing recognizes the object. A biometric recognition system includes optics for imaging a wavefront of an object to be recognized to a first intermediate image, and a detector for detecting the first intermediate image. The optics include a phase changing element configured for modifying the wavefront such that a modulation transfer function characterizing detection of the first intermediate image contains no zeros such that subsequent task based image processing recognizes the object. In an optical imaging system that includes a solid state detector, a phase-modifying element reduces reflected power from electromagnetic energy incident upon the detector without introducing aberrations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.