Digital exposure circuit for an image sensor
US6906745B1 · kind B1 · utility
41Cited by
41References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1999 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Apr 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/71
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Automatic exposure adjusting device considers the image on a pixel-by-pixel basis. Each pixel is characterized according to its most significant bits. After the pixels are characterized, the number of pixels in any particular group is counted. That counting is compared with thresholds which set whether the image is over exposed, under exposed, and can optionally also determine if the image is seriously over exposed or seriously under exposed. Adjustment of the exposure is carried out to bring the image to a more desired state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.