A method and apparatus for checking deviations in dimensions and contrast of patterns 1 which are presented for checking purposes at a practically constant speed v of a continuously variably adjustable magnitude, in particular of identical patterns 1 printed on a repetitive fixed area 3 on a strip 2...http://www.google.de/patents/US4646353?utm_source=gb-gplus-sharePatent US4646353 - Method for checking patterns and apparatus to carry out such method
