Dark current gradient estimation using optically black pixels
US9628730B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 27, 2015 |
| Grant date | Apr 18, 2017 |
| Priority date | — |
| Expiry date | Apr 18, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2209/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for removing background signal values from readout signal values generated by image pixels in a pixel array may include generating background signal values using optically black pixels formed around a border of the pixel array. The background signal values may be separated into blocks. Block average values may be calculated based on the background signal values included in each of the blocks. Corner regions of the pixel array may be free of image pixels and optically black pixels. Corner background signal values may be extrapolated based on the block average values. Image pixel background signal values may be interpolated based on the block average values and the corner background signal values. The image pixel background signal values may be subtracted from the readout values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.