DIGITAL IMAGE-PAPER REGISTRATION ERROR CORRECTION THROUGH IMAGE SHEAR

• US 20190312981A1
• Filed: 04/09/2018
• Published: 10/10/2019
• Est. Priority Date: 04/09/2018
• Status: Active Grant

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Liu, Chu-heng, McConville, Paul J., Herrmann, Douglas K., LeFevre, Jason Matthew, Praharaj, Seemit
• Granted Patent: US 10,477,034 B2
• Time in Patent Office: Days
• CPC Class Codes: B41J 11/008 Controlling printhead for accurately positioning print image on printing material, e.g. with the intention to control the width of margins
• CPC Class Codes: B41J 11/0095 Detecting means for copy material, e.g. for detecting or sensing presence of copy material or its leading or trailing end
• CPC Class Codes: H04N 1/00005 relating to image data
• CPC Class Codes: H04N 1/00037 Detecting, i.e. determining the occurrence of a predetermined state H04N1/00031 takes precedence
• CPC Class Codes: H04N 1/00082 Adjusting or controlling interrupting an operation H04N1/00915; inhibiting an operation H04N1/00925
• CPC Class Codes: H04N 1/00092 relating to the original or to the reproducing medium, e.g. imperfections or dirt detecting properties of a sheet H04N1/00681
• CPC Class Codes: H04N 1/0066 Aligning or positioning related to handling

Abstract

A method, non-transitory computer readable medium and apparatus for applying an image shear to correct a digital image-paper registration error are disclosed. For example, the method, performed by a processor of a printing device, includes detecting an amount of skew of a paper traveling through a registration system of a printing device, determining that the amount of skew is greater than a predefined threshold, applying an image shear to a digital image that will be printed on the paper, and controlling a plurality of printheads of the printing device to print the digital image on the paper with the image shear that is applied.

Claims

1-18. -18. (canceled)

19. A method for correcting an image-paper registration error, comprising:

detecting, by a processor, an amount of skew of a paper traveling through a registration system of a printing device;

determining, by the processor, that the amount of skew is greater than a predefined threshold;

applying, by the processor, a cross-process direction image shear to a digital image that will be printed on the paper before a missing jet correction is applied to the digital image, wherein the cross-process direction image shear shifts a first number of vertical scanlines in a cross-process direction, wherein the number of vertical scanlines is based on the amount of skew;

applying, by the processor, the missing jet process to the digital image after the cross-process image shear is applied;

applying, by the processor, a process direction shear to a second number of horizontal scanlines in a process direction that include the first number of vertical scanlines in the cross-process direction, wherein the second number of horizontal scanlines is based on a function of the amount of skew; and

controlling, by the processor, a plurality of printheads of the printing device to print the digital image on the paper with the cross-process direction image shear, the missing jet process, and the process direction image shear that is applied.

20. The method of claim 19, wherein the cross-process direction image shear is applied to the first number of scanlines in a simple step pixel shift or a gradual pixel shift.

21. The method of claim 19, wherein the function comprises a resolution of the digital image times a width of the digital image times the amount of skew.