Monitoring apparatus for color printing

Claim 1

A monitoring apparatus for color printing, comprising: a stroboscope for illuminating printed matter moving at a high speed with extremely short pulse-like strobe light; a color television camera for receiving an image formed by light reflected from or transmitted through said printed matter, said light being from said stroboscope; an A/D conversion circuit connected to said camera for converting a composite video signal from said camera resulting from a lag of a projected image formed on a camera tube of said color television camera, said composite video signal including a vertical synchronizing signal and a video signal; a serial to parallel conversion circuit connected to said A/D conversion circuit for converting a serial digital output signal from said A/D conversion circuit into a parallel digital signal; an IC memory connected to said serial to parallel conversion circuit for storing signals of both a first field portion and a second field portion of said composite video signal; an address control circuit connected to said IC memory for causing said IC memory to repeatedly output video signals for said field portions stored in said IC memory in an order of: one--a vertical synchronizing signal of said first field, two--a video signal of said first field, three--a vertical synchronizing signal of said second field, and four--a video signal of said first field, and a color television monitor connected to an output of a D/A conversion circuit which is connected to an output of a parallel to serial conversion circuit which is connected to an output of said IC memory for displaying a signal output from said IC memory by said address control circuit as a stationary image of said printed matter, said signal output being transmitted through said parallel to serial conversion circuit and said D/A conversion circuit.