System and method for eliminating background image data in ink images in an inkjet printer

摘要

An inkjet printer is configured to capture image data of a bare rotating imaging surface and use the image data of the bare rotating imaging surface to remove noise from subsequent images of printed ink on the rotating imaging surface. A controller in the printer is configured to measure cross-correlations between margins in the bare rotating imaging surface image data and margins in the subsequent images of printed ink to identify areas of alignment between the image data of the bare rotating imaging surface and the subsequent images of printed ink. The data in the areas in the image data of the bare rotating imaging surface that are aligned with areas in the subsequent images are used to remove the background noise produced by structure in the rotating imaging surface.

主权项

1. A method of printer operation comprising:
generating with an optical sensor having a plurality of detectors first image data of a surface of a rotating member while the surface is bare of ink, the rotating member being positioned to rotate in front of at least one printhead to form an ink image on the surface of the rotating member; operating the at least one printhead to eject ink onto the surface of the rotating member with reference to data stored in the printer; generating second image data of the surface of the rotating member while the ejected ink corresponding to the data stored in the printer is on the surface of the rotating member; aligning the first image data with the second image data; reducing noise in the second image data with reference to the first image data aligned with the second image data; processing the second image data having reduced noise to identify the ejected ink on the surface of the rotating image member; and operating the printer with reference to the ejected ink identified on the surface of the rotating image member.