Image quality correction circuit for video signals
US6373533B1 · kind B1 · utility
43Cited by
3References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1998 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Mar 4, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30201
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The tone of video signals is corrected without degrading the tone of certain image features, such as a human face. A gain controller operates and outputs an adjustment value using a histogram output produced by a histogram generator. An average value of picture levels on a screen is detected by an average picture level detector. A histogram correction circuit calculates a look-up table, and a video signal correction circuit corrects the tone of the video signals using the look-up table.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.