Gamma correction circuit for a video camera

Details Gamma correction circuit for a video camera Gamma correction circuit for a video camera

1993-12-29

1994-09-06

Groody, James J.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348675, H04N 969

Patent

active

053452658

ABSTRACT:
A gamma correction circuit for single-plate type video camera having a correlation double sampling device and receiving the signal output from a complementary-filter-type charge coupled device (CCD) to thereby produce a color line sequence signal, includes a luminance signal detector for detecting the luminance signal frown the color line sequence signal; a first gamma-corrector for performing gamma-correction to the detected luminance signal from the luminance signal detector; a second gamma-corrector for gamma-correcting the color line sequence signal; a color difference signal detector for detecting the color difference signal from the color line sequence signal which is gamma-corrected by the second gamma-corrector; and a mixer for mixing the gamma-corrected luminance signal which is gamma-corrected by the first gamma-corrector with the gamma-corrected color difference signal which is detected by the color difference signal detector. Accordingly, the gamma-correction circuit performs gamma-correction to the color line sequence signal being output from the correlation double sampling device, so that the circuit can be simplified.

REFERENCES:
patent: 4620222 (1986-10-01), Baba
patent: 4833527 (1989-05-01), Kondo
patent: 5194943 (1993-03-01), Tomita

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