Sensitivity compensating method for solid-state image pickup element used in electronic still camera
US4825293A · kind A · utility
17Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 16, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Oct 16, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/72
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for compensating changes which would otherwise be produced in a video output signal when the shutter speed exceeds a certain value, even though the same light level of the received image is maintained on the image pickup. In one embodiment, the shutter speed and/or aperture setting are adjusted to compensate. The amplification factor of the output video signal can also be adjusted. In other embodiments, gamma correction is effected separately for each primary color signal to compensate for the changes which affect the color signals in different amounts as the shutter speed is increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.