System for scanning and digitizing large images using a reseau

摘要

A method for scanning an object image and a reseau so as to prevent reseau images from appearing on the scanned object image comprising positioning a reseau in a scanning plane; scanning the reseau; storing positional errors detected by scanning the reseau; replacing the reseau with an object image to be scanned and positioning the object image in said scanning plane; scanning the object image with a plurality of swaths; and correcting the scan signals from the object image using the stored positional error signals.