Image sensor and black level calibration method thereof
US8520101B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2012 |
| Grant date | Aug 27, 2013 |
| Priority date | — |
| Expiry date | Apr 9, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image sensor including a pixel array, a sampling circuit and a black level calibration circuit is provided. The pixel array includes a first optical black area, a second optical black area and an active pixel area. The sampling circuit respectively reads first optical black information, second optical black information and active pixel information from the first optical black area, the second optical black area and the active pixel area. The black level calibration circuit determines a black level offset according to the first optical black information, and determines a black level calibration value for calibrating the active pixel information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.