公开(公告)号：US20200223230A1

公开(公告)日：2020-07-16

申请号：US16740687

申请日：2020-01-13

Applicant: HEIDELBERG DRUCKMASCHINEN AG

Inventor： JAN KRIEGER ,  FRANK SCHUMANN

IPC: B41J2/21 ,  B41J29/393

Abstract: A method for determining print defects in a printing operation carried out on an inkjet printing machine for processing a print job includes using a camera system to record and digitize printed products generated during the printing operation, feeding the camera image having been thus generated to a detection algorithm on the computer, alerting a machine control unit when print defects are found, and ejecting the printed product through a waste ejector if necessary. The detection algorithm separates color separations of the camera images, detects the print defects in the color separations, links images of the individual color separations to form a candidate image, filters the candidate image, enters the remaining detected print defects into a list, and forwards the list to the machine control unit of the printing machine.

公开(公告)号：US11752775B2

公开(公告)日：2023-09-12

申请号：US16740687

申请日：2020-01-13

Applicant: HEIDELBERG DRUCKMASCHINEN AG

Inventor： Jan Krieger ,  Frank Schumann

IPC: B41J2/21 ,  B41J29/393

CPC classification number: B41J2/2142 ,  B41J2/2139 ,  B41J2/2146 ,  B41J29/393 ,  B41J2029/3935

Abstract: A method for determining print defects in a printing operation carried out on an inkjet printing machine for processing a print job includes using a camera system to record and digitize printed products generated during the printing operation, feeding the camera image having been thus generated to a detection algorithm on the computer, alerting a machine control unit when print defects are found, and ejecting the printed product through a waste ejector if necessary. The detection algorithm separates color separations of the camera images, detects the print defects in the color separations, links images of the individual color separations to form a candidate image, filters the candidate image, enters the remaining detected print defects into a list, and forwards the list to the machine control unit of the printing machine.