Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1977-04-26
1979-03-06
Dahl, Lawrence J.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
356 71, G06K 500
Patent
active
041432797
ABSTRACT:
A method and apparatus for detecting printing faults or errors in a sample of printed material, such as a bank note, by determining the relative positions of corresponding text on the sample and each of a number of original bank notes, each having been printed by a different printing process used in printing the sample combining the text of the originals optically or electronically taking into account the positions of the text in the originals relative to the text on the sample resulting from superimposition of the text produced by each of the printing process used to produce each original, and comparing the text of the sample with the total combined text. The relative positions of corresponding text on the sample and originals is determined by scanning the sample and originals and obtaining reflectances values at each of a number of corresponding raster points and correlating the corresponding reflectance values to obtaining the relative position values.
REFERENCES:
patent: 2731621 (1956-01-01), Sontheimer
patent: 3196392 (1965-07-01), Horowitz et al.
patent: 3496371 (1970-02-01), Endo
Ehrat Kurt
Huber Ernst
Huber Josef
Mast Fred
Dahl Lawrence J.
Gretag Aktiengesellschaft
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