System and Process for Automatic Print Head Registration of a Digital Printing Machine

摘要

A process for measuring and correcting the amount of mis-registration between first and second print heads of a digital printing machine without physical adjustment of the print heads. The process comprises a step of printing a calibration test page comprising overlapping registration targets created by the first and second print heads. The overlapping registration targets each comprise a target region comprising X and Y co-ordinates. The process further comprises a step of scanning the calibration test page to produce a bitmap image. The process further comprises a step of processing the bitmap image to produce a mis-registration score for each target region. The process further comprises a step of producing X and Y registration correction amounts for the second print head based upon the mis-registration scores. The process further comprises a step of adjusting the print data to the second printhead based upon the X and Y registration correction amounts.

主权项

1. A printing system for measuring and correcting the amount of mis-registration between first and second print heads of a digital printing machine without physical adjustment of the first and second print heads, the system comprising:
a calibration image generation system configured to create a printed calibration test page; said printed calibration test page comprising a plurality of pairs of overlapping registration targets imprinted by the first and second print heads, each of said pair of overlapping registration targets comprising a target region comprising X and Y coordinates; a scanning and image processing system comprising a memory system and an image processing module stored on said memory system; said image processing module comprising: a first set of code configured to scan said printed calibration test page to produce a bitmap image; a second set of code configured to process said bitmap image to produce a mis-registration score for each of said target regions; said second set of code further comprises code to blur said bit map image to produce a blurred bit map image; a third set of code configured to produce X and Y registration correction amounts for the second print head based upon the mis-registration scores; and a registration correction system configured to adjust the print data to the second print head based upon said X and Y registration correction amounts.