auto white balance circuit

Abstract

Abstract PURPOSE:To enable correct white balance adjustment by allowing white balance operation to act only in the case of a picture the ratio of whose integrated value lies within a prescribed range. CONSTITUTION:The gain of the variable gain amplifier 6 of a some primary color signal G is fixed, and the integrated values IR, IG, IB of three primary color signals R,G,B are obtained in each integration circuit 8 to 10, and the ratios IR/IG, IB/IG of the integrated values are supplied respectively to a gain calculation circuit 13. Then, they are compared with the ratio of the integrated values set beforehand in the gain calculation circuit 13, and only when the ratio of the integrated values lies within the prescribed range, the gains of the amplifiers 5,7 of other primary color signals R, B are controlled according to the integrated values. Thus, an auto-white-balance circuit capable of executing the correct white balance adjustment can be obtained.

Inventors

• 👤 Masaaki Tsuruta
• 👤 雅明 鶴田
• 👤 Satoshi Tsuchiya
• 👤 聡 土屋

Bibliographic Details