Skin color correction circuit

Abstract

Abstract PURPOSE:To attain skin color correction by adding a prescribed number of multiple of an absolute value component of a Q signal to an I signal so as to suppress a change in the color saturation after correction of a signal having a comparatively large phase difference from the I axis. CONSTITUTION:An output ¦Qo¦ of an absolute value circuit 18 is fed to a K multiple circuit 20, in which the signal is multiplied by K. The output is fed to an adder 24 together with an Io signal inputted to a terminal 12 via a switch 22. Moreover, the Qo signal is fed to a contact 26b of the switch 26 and a DC voltage 28 is fed to a contact 26a. When a phase deciding circuit 16 decides the lock range by a skin color correction circuit 10, the switch 22 is closed and a moving contact 26c of the switch 26 is switched to the contact 26a. Thus, since the output ¦Qo¦ of the absolute value circuit 18 is fed to the K multiple circuit 20, in which the signal is multiplied by K and the switch 22 is closed, the signal is fed to an adder 24. Thus, a current Io' (=Io+K¦Qo¦) is outputted at the output of the adder 24, that is, at a terminal 30.

Inventors

• 👤 Tetsuhiro Maeda
• 👤 哲宏 前田

Bibliographic Details