Shade gradation correction method and apparatus
US5930401A · kind A · utility
2Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 15, 1996 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | May 15, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4076
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A detecting unit generates defference data between optical black level of digital input data and a predetermined black level and generates .gamma. characteristics selection signal. An offset signal obtained from the difference is added to the input data by an adding circuit. A .gamma. characteristics setting unit is supplied with the difference data and the output signal of the adding circuit and outputs a signal in which a white level, black level and .gamma. characteristics are corrected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.