Patent ID: 6373973
Filing Date: 2002-04-16
Classification: B41F,G07D

Abstract:
A method of controlling printed valuable or security items, each item carrying at least first and second superimposed printing, comprising two partial images which are printed in different printing steps, said method comprising the steps of:a) storing at least a first specimen partial image of said first printing and a second specimen partial image of said second printing; b) acquiring a controlled-item image having predetermined significant details of said first printing and of said second printing; c) determining at least one deviation value of said predetermined significant details in said controlled-item image; d) rejecting the controlled-item image when said at least one deviation value is outside a predetermined permissible range; e) acquiring a specimen-item image having the same value of the at least one deviation value, when said at least one deviation value is inside said predetermined permissible range; and f) comparing said controlled-item image with said specimen-item image; the step of acquiring a specimen-item image comprising the steps of: e1) acquiring said first specimen partial image and said second specimen partial image; e2) constructing a respective specimen-item image for each controlled-item image by superimposing said first specimen partial image and said second specimen partial image on the basis of the determined at least one deviation value in said controlled item image.