Method of controlling a printed object
AssigneeCurrency Systems International
InventorsArmando Neri, Stefano Chini
Life of this patent
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Abstract
A method of controlling an object having a first and a second print executed at different stages, the method providing for acquiring an image of the object; calculating a relative deviation between the first print and the second print of the object; forming a virtual specimen image by superimposing a reference image of the first print and a reference image of the second print and taking into account the relative deviation; comparing the image with the specimen image; and emitting an error signal in the event the luminance values of the image fail to fall within an acceptance range of the luminance values of the specimen image, and the relative deviation is above a given value.
Claims16
A method of controlling a printed object comprising a first and a second print (O, I) executed at different stages;
- the method comprising the steps of acquiring a first image (18) of the controlled object (2);
- comparing said first image (18) with a specimen (BC) second image (25);
- calculating a relative deviation (DX1R, DY1R, DX2R, DY2R, DBR) between the first print (O) and the second print (I) of said object (2);
- and emitting an error signal in the event the luminance values of the first image (18) fail to fall within an acceptance range (R) of the luminance values of the second image (25), or said relative deviation (DX1R, DY1R, DX2R, DY2R, DBR) is above a given value;
- said method being characterized in that said second image (25) is a virtual image formed by superimposing a reference third image (10;
- 29) of the first print (O) and a reference fourth image (11, 28;
- 11) of the second print (I), and taking into account said relative deviation (DX1R, DY1R, DX2R, DY2R, DBR).
Dependencies are inferred from the claim text.