Image pickup apparatus compensating an image signal for variatio

Details Image pickup apparatus compensating an image signal for variatio Image pickup apparatus compensating an image signal for variatio

1987-01-16

1989-11-07

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 44, 358909, H04N 904

Patent

active

048795917

ABSTRACT:
A color image pickup apparatus comprises a color image pickup element and a shutter device for exposing the pickup element to an image light. The apparatus further comprises a color signal level adjusting circuit and a control circuit. In one embodiment, when the exposure time is set to a period shorter than one TV field period, the exposure timing is controlled by the controlled circuit at a predetermined phase of the color temperature change of the illumination. In another embodiment, the level adjusting circuit is controlled by the control circuit in accordance with the phase relationship of the exposure timing relative to the color temperature change of the illumination. Thus, an appropriate compensation of the image signal for the color temperature change can be achieved at the time of the image picking up under the illumination whose color temperature changes periodically.

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