EP 0012723 B1 19820915 - PROCESS FOR MECHANICALLY ASSESSING THE PRINT QUALITY OF A PRINTED PRODUCT AND DEVICE FOR PERFORMING THE SAME
Title (en)
PROCESS FOR MECHANICALLY ASSESSING THE PRINT QUALITY OF A PRINTED PRODUCT AND DEVICE FOR PERFORMING THE SAME
Publication
Application
Priority
CH 1283278 A 19781218
Abstract (en)
[origin: US4303832A] 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.
IPC 1-7
IPC 8 full level
B41F 33/00 (2006.01); B41F 33/14 (2006.01); G01N 21/88 (2006.01); G01N 21/89 (2006.01); G01N 21/892 (2006.01); G01N 21/93 (2006.01); G07D 7/00 (2006.01); G07D 7/20 (2006.01)
CPC (source: EP US)
B41F 33/0036 (2013.01 - EP US); G07D 7/121 (2013.01 - EP US)
Designated contracting state (EPC)
AT CH DE FR GB IT NL
DOCDB simple family (publication)
EP 0012723 A1 19800625; EP 0012723 B1 19820915; AT E1561 T1 19820915; CA 1127868 A 19820720; DE 2963696 D1 19821104; JP S5583840 A 19800624; US 4303832 A 19811201
DOCDB simple family (application)
EP 79810177 A 19791212; AT 79810177 T 19791212; CA 341967 A 19791214; DE 2963696 T 19791212; JP 16092079 A 19791213; US 10241979 A 19791211