Method for judging printing sheets

Details Method for judging printing sheets Method for judging printing sheets

1992-08-06

1994-05-31

Evans, F. L.

Optics: measuring and testing

By configuration comparison

With comparison to master, desired shape, or reference voltage

G01B 1100

Patent

active

053173902

ABSTRACT:
Individual printed image elements from an image to be inspected are allotted individual nominal ink density values, as by scanning an ideal printed sheet by a CCD matrix camera. The ideal values are stored in a main memory having segments for maximum and minimum values for each image element. A multiplicity of proof images are scanned, and their density values measured and stored for each proof judged acceptable by an inspector. Thereafter, the variations in the acceptable proof density values are stored in the main memory as maximum and minimum acceptable deviations from the initial nominal values for each individual image element to provide a subjective tolerance value for the nominal density values in the main memory.

REFERENCES:
patent: 4390958 (1983-06-01), Mamberer
patent: 4561103 (1985-12-01), Horiguchi et al.
patent: 4677680 (1987-06-01), Harima et al.
A. Rosenfeld, "Multiresolution Image Processing and Analysis", Springer Series in Information Sciences, 1984, pp. 1-5, 364-379, Berlin.
Sobey et al., "Detection and Sizing Visual Features in Wood", Pattern Recognition, Bd. 22, Nr. 4, 1989, Elmsford, NY US, pp. 367-380.
Tanimizu, "High Speed Defect Detection Method for Coloer Printed Matter", 16th Annual Conference of IEEE Industrial Electronics Society, Bd. 1, 27 Nov. 1990, Asilomar Conference Center CA. (US), pp. 653-658.

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