Correction of non-uniform sensitivity in an image array
US8045040B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2009 |
| Grant date | Oct 25, 2011 |
| Priority date | — |
| Expiry date | Oct 6, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved non-uniform sensitivity correction algorithm for use in an imager device (e.g., a CMOS APS). The algorithm provides zones having flexible boundaries which can be reconfigured depending upon the type of lens being used in a given application. Each pixel within each zone is multiplied by a correction factor dependent upon the particular zone while the pixel is being read out from the array. The amount of sensitivity adjustment required for a given pixel depends on the type of lens being used, and the same correction unit can be used with multiple lenses where the zone boundaries and the correction factors are adjusted for each lens. In addition, the algorithm makes adjustments to the zone boundaries based upon a misalignment between the centers of the lens being used and the APS array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.