Lens correction logic for image sensors
US7907185B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 2007 |
| Grant date | Mar 15, 2011 |
| Priority date | — |
| Expiry date | May 21, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods of calibrating a pixel correction function for compensating for vignetting in an optical device include exposing an optical device to a reference object in order to generate pixel data of at least part of an image of the reference object. A pixel correction function is provided including a first number of unknown constant values. Pixel data of a second number of sample points is provided from the pixel data of the at least part of the image. The second number is equal to the first number or the first number plus one. The constant values are determined using the pixel data of the second number of sample points. The method allows a pixel correction function to be calibrated with a small number of sample points, thereby simplifying calibration processes for individual optical devices, and thus reducing the manufacturing costs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.