Video camera

Abstract

Abstract PURPOSE:To attain reproduction for a reproduction picture in an optimum white balance state by using plural signals obtained by sampling the electric signals outputted from an image pickup device at plural points having time intervals respectively to decide the white balance. CONSTITUTION:When an image pickup button is pushed, a control circuit 27 samples and quantizes color difference signals S4 and S5 by A/D converters 21 and 22 at specific time intervals to store them to a memory circuit 30. When the circuit 30 is overflowed, the oldest signal is erased to memorize a new signal. The circuit 27 calculates the mean value of each digitized color different signal stored in the circuit 30 every time a new signal is stored to the circuit 30. The mean value is defined as S23 and S24 respectively to undergo D/A conversions 26 and 28 and the result is compared with the outputs of reference voltage generating circuits 25 and 29. Then comparison signals S33 and S34 are outputted. Then the circuit 27 sends outputs S18 and S19 of A/D converters 15 and 19 to gain control circuits 6 and 7 while monitoring signals S33 and S34 to control the gains of color difference signals S1 and S3.

Inventors

• 👤 Masuo Kitano
• 👤 北野　倍生

Bibliographic Details