Gamma correction of digital video data by calculating linearly interpolated gamma correction values
US4786968A · kind A · utility
16Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1987 |
| Grant date | Nov 22, 1988 |
| Priority date | — |
| Expiry date | Jul 16, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/202
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus, including a lookup table memory, for gamma correcting a digital video signal based on the assumption that for small gamma, gamma correction is a linear function so that for a digital video input signal value x a gamma correction value d to be added to x can be calculated as a function of an opertor selected variable a according to the formulae: EQU d=10.multidot.0.multidot.(x-x.sup.1.10) EQU or EQU d=10.multidot.9.multidot.(x-x.sup..90 ).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.