Video camera

Abstract

Abstract PURPOSE:To obtain white balance by gating only the center part out of modulation output of an image signal, operating an alarm circuit by the output and copying a white object without using a diffusion plate. CONSTITUTION:Outputs of color difference signals from color difference circuits 4 and 5 are added to a modulation circuit 9, thereby obtaining modulation outputs. Only the center part out of the modulation output is taken out by a gate circuit 10. After the center part is wave-shaped by a shaping circuit 11, the result is supplied to a level detector 12. If a redish object image is picked up, the level detector 12 outputs a detected signal, which is added to an alarm circuit 13 because the redish object image exceeds the reference of a white level at the level detector 12. At this time, the alarm that the detection signal is unsuitable for the reference data of white balance adjustment is given. In such a manner, white balance is obtained by using the white object as reference data without using the diffusion plate.

Inventors

• 👤 Takayuki Kimura
• 👤 隆行 木村

Bibliographic Details