Simple gamma correction circuit for multimedia
US6020921A · kind A · utility
10Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 1997 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | May 5, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/69
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A gamma correction circuit comprising circuit apparatus for approximating in linear translation circuits successive nonlinear portions of a gamma correction curve, apparatus for applying an input luminance (Y) signal to the circuit apparatus, and selection apparatus for selecting signals translated by any of the circuit apparatus as a gamma corrected output signal depending on whether the input signal falls within predetermined ranges approximately corresponding to the nonlinear portions of the gamma correction curve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.