Method and apparatus for testing the print quality of...

Details Method and apparatus for testing the print quality of... Method and apparatus for testing the print quality of...

G - Physics

06

K

354/57.1

G06K 5/00 (2006.01) G07D 7/12 (2006.01) G07D 7/20 (2006.01)

Patent

CA 1084166

Method and apparatus for testing the print quality of printed texts, more particularly banknotes Abstract of the Disclosure 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.

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