Patent ID: 6822763
Filing Date: 2004-11-23
Classification: H04N

Abstract:
A method of calibrating a document scanner, wherein the scanner includes an optical element, the method comprising the steps of:positioning a calibration structure in a first position in which a first portion of the calibration structure is in the field of view of the optical element of the scanner; scanning the first portion of the calibration structure to perform a light calibration; placing a portion of a document in the field of view of the optical element; positioning the calibration structure in a second position in which a second portion of the calibration structure is in the field of view of the optical element, and the document is in the optical path between the optical element and the second portion of the calibration structure; determining the width of the document; and positioning the calibration structure in a third position in which a third portion of the calibration structure is in the field of view of the optical element, wherein the third portion of the calibration structure includes a document backer element.