G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/84 (2006.01) B41F 33/00 (2006.01) G01B 11/28 (2006.01)
Patent
CA 2062457
The invention relates to a process and a device for determining the area coverage of a printing original, particularly of a printing forme of a printing press, preferably of an offset printing press, with the local diffuse reflection of a measured measuring field being determined by optical scanning of the original and the original having a location-dependent inhomogeneity, said inhomogeneity being independent of the area coverage and influencing the measuring result of the scanning. In order to reduce measuring errors, it is provided that the printing areas have a different colour (colour difference) as compared with the non-printing areas of the original, that at least two diffuse-reflection values are determined from each measuring field (12), said diffuse-reflection values differing spectrally from one another according to the colour difference, and in that the two diffuse-reflection values are evaluated in order to separate a component of the measuring result that is influenced by the area coverage (fD) and a component of the measuring result that is influenced by the inhomogeneity (?).
Huber Werner
Kipphan Helmut
Heidelberger Druckmaschinen Ag
Johnson Douglas S. Q.c.
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