US 11,981,124 B2
Method and system for aligning images printed with digital printer and analog cylinders
Filippo Salamone, Grassobbio (IT)
Assigned to Electronics for Imaging, Inc., Londonderry, NH (US)
Filed by Electronics for Imaging, Inc., Fremont, CA (US)
Filed on Sep. 16, 2022, as Appl. No. 17/933,031.
Prior Publication US 2024/0092098 A1, Mar. 21, 2024
Int. Cl. B41J 11/42 (2006.01); G06K 15/02 (2006.01); G06K 15/10 (2006.01)
CPC B41J 11/42 (2013.01) [G06K 15/027 (2013.01); G06K 15/102 (2013.01); G06K 15/1849 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for aligning images printed with digital printer and rotary cylinders, the method comprising:
measuring, by an encoder, a position of a substrate on a belt;
capturing, by a first camera, at least one digital image of the substrate;
transmitting, by a processor on the first camera, the at least one digital image to a processing device;
performing digital image processing by the processing device on the at least one digital image to identify two shapes;
responsive to identifying the two shapes, determining, by the processing device, positions of each of the two shapes using the measured position of the substrate;
measuring, by the processing device, a distance between the determined positions of each of the two shapes;
calculating, by the processing device, an error, wherein the error is the difference between the measured distance and a predetermined distance of the two shapes; and
adjusting either a digital printer, a speed of a rotary cylinder, or a speed of the belt, based on the error.