METHOD FOR MEASURING CRT CONVERGENCE

PROBLEM TO BE SOLVED: To provide a method for measuring CRT convergence by which the measuring time can be shortened by using three monochromatic CCD cameras in a general purpose color image processing system. SOLUTION: A synchronizing separator circuit sends a synchronizing signal Sr to a synchronous distributor 4 upon receiving video signals Vr from a standard monochromatic CCD camera 2R and the output of the distributor 4 is sent to other two monochromatic CCD cameras 2G and 2B and becomes external synchronizing signals Sg and Sb. Video signals Dr, Dg and Db outputted from synchronizing separator circuits 3R, 3G and 3B are converted into the voltage of an image processing system through video amplifiers 5R, 5G and 5B and sent to a color image processing circuit 6 as a composite synchronizing signal together with a synchronizing signal Sd from the distributor 4.