Method and device for determining the area coverage of an origin

Details Method and device for determining the area coverage of an origin Method and device for determining the area coverage of an origin

1992-03-25

1998-03-03

Evans, F. L.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

356406, 356419, G01B 1128

Patent

active

057241430

ABSTRACT:
A method of determining area coverage of a printing original having printing areas and non-printing areas thereon, the printing areas being of a different color than that of the non-printing areas, the printing original having a location-dependent inhomogeneity independent of the area coverage, including optically scanning the original for determining a local diffuse reflection of a measured measuring field, the measuring result of the optical scanning being influenced by the inhomogeneity; determining at least two diffuse-reflection values from each measuring field, the diffuse-reflection values differing spectrally from one another in accordance with the color difference; and evaluating the two diffuse-reflection values and separating a component of the measuring result which is influenced by the area coverage, and a component of the measuring result which is influenced by the inhomogeneity; and the device thereof.

REFERENCES:
patent: 4444505 (1984-04-01), Imamoto et al.
patent: 4512662 (1985-04-01), Tobias
patent: 4564290 (1986-01-01), Bell et al.
patent: 4681455 (1987-07-01), Jeschke et al.
patent: 5141323 (1992-08-01), Kipphan et al.

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