Autoregistration system for color TV cameras

摘要

An autoregistration system is disclosed for a color television camera equipped with a plurality of image pickup devices so as to combine picture signals obtained through the plurality of channels from the plurality of image pickup devices into a composite color television signal. The autoregistration system comprises means for producing a level difference signal representing a predetermined difference in level between the picture signals of desired two channels, between which a picture image registration is to be carried out, and a first and second edge signals of the two channels; and means for subjecting the level difference signal and first and second edge signals to an operational processing to obtain a discriminatory signal representing the direction of a registration offset between the picture signals of the two channels. The above autoregistration system is employed to perform with ease the registration automatically whenever needed, without need for any special optical pickup unit having a built-in test pattern. The autoregistration system is particularly suited for portable color TV cameras which are frequently exposed to varying use conditions. Owing to the obviation of such a special optical pickup unit, the autoregistration system is small in size and low in manufacturing cost.