Method for checking patterns and apparatus to carry out such...

Details Method for checking patterns and apparatus to carry out such... Method for checking patterns and apparatus to carry out such...

G - Physics

06

K

354/56, 352/53.7

G06K 9/20 (2006.01) G06K 7/10 (2006.01)

Patent

CA 1207908

METHOD FOR CHECKING PATTERNS AND APPARATUS TO CARRY OUT SUCH METHOD Abstract A method and apparatus for checking deviations in dimensions and contrast of patterns 1 which are presented for checking purposes at a practically constant speed v of a continuously variably adjustable magnitude, in particular of identical patterns 1 printed on a repetitive fixed area 3 on a strip 2 of flat carrier material 30, each pattern 1 consisting of parallel lines of bar codes printed at pre- determined mutual distances, by optically forming an image of each pattern to be checked upon a fixed format and by taking several traverse images therefrom at an angle .beta. with respect to the direction 6 of the bars by means of the row(s) of closely arranged electrical sensing elements, said tra- verse images being read out serially and subsequently entered into an electronic arithmetic apparatus for comparison with a reference pattern.

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