Method For Calibrating Optical Detector Operation With Marks Formed On A Moving Image Receiving Surface In A Printer

摘要

A method for calibration of an optical sensor to scan printed marks in a printer includes operating inkjets to form printed marks on an image receiving surface and activating the optical sensor after the image receiving surface moves a predetermined distance to generate scanned image data of a region of the image receiving surface that is longer than the region containing the printed marks. The method includes identifying an error between the location of the printed marks in the scanned image data and a predetermined expected location for the marks, and adjustment of the distance that the image receiving surface moves prior to activation of the optical sensor to correct the error.

主权项

1. A method for calibration of an optical sensor to scan printed marks on an image receiving surface in a printer comprising:
operating inkjets in a plurality of printheads to form a plurality of marks on a first region of the image receiving surface as the first region passes the plurality of printheads, the first region having a first length in a process direction; activating an optical sensor to generate first scanned image data corresponding to a second region of the image receiving surface in response to the first region of the image receiving surface moving by a predetermined distance in the process direction, the second region having a second length in the process direction that is longer than the first length of the first region and at least a portion of the first region being contained within the second region; identifying a relative process direction location of the plurality of marks in the first scanned image data with reference to a first end and a second end of the second region in the first scanned image data; identifying an error between the relative process direction location of the plurality of marks in the second region and a predetermined relative process direction location within the second region; adjusting the predetermined distance in the process direction by an amount corresponding to the identified error; and storing a value of the adjusted predetermined distance in a memory to adjust a time of operation for the optical sensor during generation of additional scanned image data of the image receiving surface.