Video system having an adjustable digital gamma correction for contrast enhancement
US4394688A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1981 |
| Grant date | Jul 19, 1983 |
| Priority date | — |
| Expiry date | Aug 25, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/202
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video system having a television camera, a digital video signal processor coupled to the output of the television camera and a television monitor coupled to the output of the digital video signal processor is disclosed. The digital video signal processor includes an analog to digital converter for converting analog video signals into video data, a frame memory processor for processing and temporarily storing the video data, a random access memory device in which the video data is altered in accordance with the contents of a table-look-up temporarily written therein, a read only memory device containing a plurality of different table-look-ups, each table-look-up containing data representing a different gamma correction, a central processing unit for obtaining a table-look-up from the read only memory device and then writing the table-look-up into the random access memory device and a manually operated control device coupled to the central processing unit for selecting which table-look-up is read out from the read only memory device and then written into the random access memory device and a digital to analog converter for converting the processed video data into analog video signa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.