Gamma correction circuit

Details Gamma correction circuit Gamma correction circuit

1983-01-27

1985-12-10

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

328142, H04N 520

Patent

active

045583633

ABSTRACT:
A gamma correction circuit to adjust the output of a video signal to the particular picture tube used including an exponential impedance changing element for gamma-correcting a non-gamma corrected input signal to produce a gamma-corrected signal. A current adder circuit adds the gamma-corrected signal to the non-gamma corrected input signal and includes a double balance type adder coupled to a series arrangement of variable and fixed DC voltage sources. The adder circuit has a combination of resistance means to add the gamma-corrected signal to the non-gamma corrected input signal at the desired adding ratio, while maintaining the signal levels of the gamma-corrected signal and the non-gamma corrected input signal coincident.

REFERENCES:
patent: 2692333 (1954-10-01), Holmes
patent: 3534168 (1970-10-01), Van Lookeren
patent: 3970774 (1976-07-01), Bazin et al.
patent: 4015079 (1977-03-01), Satou

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