Patent ID: 8045218

Claim:
A method comprising: printing a first set of reference marks on one side of a substrate with a first print engine; printing a second set of reference marks on the same side of the substrate as the first set of reference marks with a second print engine; sensing both sets of reference marks on the substrate with an image sensing unit and generating a digital image of the reference marks; performing image analysis on the digital image to obtain an image-to-image distortion map where the image-to-image distortion map is a local measure of difference between the first set of reference marks and the second set of reference marks, wherein the image-to-image distortion map comprises an array of distances relating a grid formed by the second set of reference marks to a grid formed by the first set of registration marks; and generating a compensated customer image by using the image-to-image distortion map to reduce registration errors when using the first and second print engines.