1. A method comprising: performing, by a computer: locating first fiducial marks within a scanned image of a document on which the first fiducial marks have been printed; locating a code mark within the scanned image of the document on which the code mark has been printed, the code mark between the first fiducial marks, a provided location of a feature within the document being directly encoded within the code mark; locating, based on the code mark, a second fiducial mark other than the first fiducial marks; setting a first unit of measure for a first axis of the scanned image based on a distance in pixels along the first axis between the first fiducial marks; setting a second unit of measure for a second axis based on a distance in pixels along the second axis between the second fiducial mark and the first fiducial marks; and determining an actual location of the feature within the scanned image of the document other than the first fiducial marks, the second fiducial mark, and the code mark, based on the provided location of the feature within the document as encoded by the code mark, and based on the first unit of measure and the second unit of measure, wherein determining the actual location of the feature based on the provided location of the feature and on the first and second units of measure is performed independent of different resolutions of scanning the document along the respective first and second axes.