Video system having an adjustable digital gamma correction for c

Details Video system having an adjustable digital gamma correction for c Video system having an adjustable digital gamma correction for c

1981-08-25

1983-07-19

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358164, 358163, 358166, 358169, 382 54, H04N 514, H04N 520

Patent

active

043946887

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 signals.

REFERENCES:
patent: 3800078 (1974-03-01), Cochran et al.
patent: 4148070 (1979-04-01), Taylor
patent: 4242707 (1980-12-01), Budai
patent: 4335427 (1982-06-01), Hunt et al.

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