Video camera having a .gamma.-correction circuit for correcting

Details Video camera having a .gamma.-correction circuit for correcting Video camera having a .gamma.-correction circuit for correcting

1991-11-05

1993-03-16

Kostak, Victor R.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 31, 358 29, H04N 969, H04N 973 C

Patent

active

051949431

ABSTRACT:
A detection circuit for detecting a color temperature of the ambient light of an object is provided in a video camera. A .gamma.-correction circuit for subjecting a luminance signal Y obtained by processing an output signal of a solid-state imaging device to .gamma.-correction with a fixed gamma coefficient changes the correction level of the luminance signal Y in accordance with the fluctuation of the color temperature detected by the detection circuit. As a result, it is prevented that in a low color temperature, a red portion of a reproduced image becomes abnormally bright. Further, there is provided an illuminance detection circuit. In a low illuminance, the correction level of the .gamma.-correction circuit is reduced to prevent mixture of the noise.

REFERENCES:
patent: 4700219 (1987-10-01), Tamika et al.
patent: 4992854 (1991-02-01), Aso et al.
patent: 4998162 (1991-03-01), Kondo et al.
patent: 5103298 (1992-04-01), Kashimura et al.

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