White balance adjustment device

Abstract

Abstract PURPOSE:To avoid a disadvantage of white balance from being deviated to a complementary color side as to the entire pattern by limiting the degree of contribution in the white balance adjustment when an object with high saturation exists in the pattern. CONSTITUTION:R, B signals in three primary color signals are inputted to a camera process and matrix 6 via R, B amplifier circuits 4, 5 respectively together with the G signal, color difference signals R-Y, B-Y are generated and fed to a selection circuit 21. When the integration of two fields of the color difference signals R-Y, B-Y is finished by the selection circuit 21 and an integration device 23 by using a selection signal from a timing circuit 25, a color evaluation value is stored in a memory 26. A color evaluation value adjustment circuit 27 when an object with extremely high saturation exists in the pattern adjusts the color evaluation so as to reduce the effect onto the white balance adjustment over the entire pattern. Based on the color evaluation subject to adjustment and processing, a pattern evaluation circuit 28 calculates the pattern color evaluation being the entire color evaluation of the pattern and gain control circuits 29, 30 control the gain of the amplifier circuits 4, 5 so as to make the pattern color evaluation zero.

Inventors

• 👤 Toshinobu Haruki
• 👤 春木　俊宣
• 👤 Kenichi Kikuchi
• 👤 健一 菊地

Bibliographic Details