Patent ID: 8520266

Claim:
A method of measuring image on paper registration comprising: placing a test sheet of media including a plurality of test pattern marks created by a printer on a platen of an image sensing device, the platen defining a scan area over which the image sensing device is capable of scanning an image, the image sensing device including a plurality of calibration marks falling within the scan area, the test pattern marks are each disposed adjacent calibration marks when the sheet is placed on the platen; operating the image sensing device to scan the test sheet and the test pattern marks thereon; determining a scanned position of the calibration marks and a scanned position of the test pattern marks resulting from the scan, the location of the test pattern marks being determined relative to adjacent calibration marks; comparing the scanned position of the calibration marks with corresponding predetermined calibration marks reference positions to determine scanning error; determining an adjusted position of the scanned test pattern marks responsive to the scanning error to compensate for scanner error; and comparing the adjusted positions of the scanned test pattern marks with a predetermined known reference positions of the test pattern marks to measure registration accuracy of the printer.