Process for assessing the quality of a printed product

Details Process for assessing the quality of a printed product Process for assessing the quality of a printed product

G - Physics

01

N

354/21, 73/58, 3

G01N 21/27 (2006.01) B41F 33/00 (2006.01) G07D 7/20 (2006.01)

Patent

CA 1127868

Case 7-12153/GTS 439 ABSTRACT A PROCESS FOR ASSESSING THE QUALITY OF A PRINTED PRODUCT Specimens, the quality of whose print is to be examined, are scanned photoelectrically point-by-point and compared point-by-point with one or more originals. The resulting reflectance differences are processed in different correction stages and then subjected to a point-by-point threshold decision, an individual thres- hold value being used for each image point. The thres- hold values are produced by analysis of specimens which have acceptable deviations, the maximum positive and negative reflectance differences due to their deviations being used directly as the threshold values. The analy- sis is effected by reference to electronically simulated specimens, an original or originals and a specimen being electronically displaced relatively to one another and reflectances being electronically varied in order to simulate resister deviations and shade or tone deviations.

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