Automatic gamma correction for multiple video sources
US6441870B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1998 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Dec 22, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/202
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system has video output connections capable of connecting to different display devices. The system has input connections capable of receiving image signal from multiple sources. A table of gamma values is indexed by both the display type and image source type. A software or hardware module applies a gamma correction from the table to the received video to transform it to have a gamma consistent with that of the display device. In a further embodiment, the images are encoded with a gamma identifier which is used to index into the table of system gammas. A video card that detects video source and display is also described. The video card utilizes a table of gamma values indexed by video source and display type and operating mode. Images are then corrected by the card to display properly on the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.