| 摘要 |
PURPOSE:To eliminate overflow by providing a circuit adding/subtracting plural coded input signals, a multiplier multiplying a constant to a signal and an adder adding both outputs. CONSTITUTION:Primary color signals B, G, R are inputted to terminals 5-7 and a color difference signal R-Y is synthesized by the adder/subtractor circuit 301 as follows; R-Y=0.7R-(0.6G+0.1B). The signal R-Y is outputted from a terminal 8. On the other hand, one of the input signals, R is inputted to the multiplier circuits 302, where a constant K0 is multiplied and the correcting amount whose white balance is changed is outputted from a terminal 9 as R. The signals R and R-Y are added by the adder circuit 303, and the result is outputted from a terminal 10 as the color difference signal R-Y subject to well white balance. Thus, the signal processing multiplying a constant >=1 is eliminated in the signal processing circuit thereby eliminating overflow. |
