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

1979-12-11

1981-12-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356 71, G06K 500

Patent

active

043038328

ABSTRACT:
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 threshold value being used for each image point. The threshold 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 analysis 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 register deviations and shade or tone deviations.

REFERENCES:
patent: 3275985 (1966-09-01), Dunn et al.
patent: 4184081 (1980-01-01), Bergamini

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