Gamma correction circuit for television

Details Gamma correction circuit for television Gamma correction circuit for television

1983-01-14

1985-03-05

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 32, H04N 520

Patent

active

045034648

ABSTRACT:
A gamma correction circuit for television, incorporating a gamma corrector (9) having an output (10) with a gamma-corrected signal (S2), a first superposition stage (16) for supplying, relative to the linear input signal (S1) a difference signal (S3) which corresponds to the gamma correction, a second superposition stage (3) for supplying a signal (S1+S3') which is formed by the difference signal (S3), with inverted gamma relative to the linear input signal (S1) which signal (S1+S3') is applied to the gamma corrector (9). As a result thereof values which exceed the peak-white value (w) are not displayed with a picture brightness which is less than the peak-white value (w).

REFERENCES:
patent: 4200888 (1980-04-01), Blom
patent: 4227216 (1980-10-01), Blom

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