Video contrast expanding arrangement

Details Video contrast expanding arrangement Video contrast expanding arrangement

1978-10-17

1980-05-20

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358174, H04N 552

Patent

active

042042291

ABSTRACT:
An arrangement which enables a contrast range to be defined for the video signal between two adjustable potential levels and thus an increase in contrast to be obtained when the signal intended for an image display varies within a more restricted range. It comprises inserted in the video chain, a circuit for aligning the video signal to a first potential level and an automatic gain control circuit which receives the output of the aligning circuit and performs a complementary alignment to the second potential level. Each circuit includes a loop which responds with a determined time-constant to the respective peak variations in the signal in the course of at least an image scan period.

REFERENCES:
patent: 3569620 (1971-03-01), Baun

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