1. A printing system for measuring and correcting the amount of mis-registration between first and second print heads of a digital printing machine without physical adjustment of the first and second print heads, the system comprising: a calibration image generation system configured to create a printed calibration test page; said printed calibration test page comprising a plurality of pairs of overlapping registration targets imprinted by the first and second print heads, each of said pair of overlapping registration targets comprising a target region comprising X and Y coordinates; a scanning and image processing system comprising a memory system and an image processing module stored on said memory system; said image processing module comprising: a first set of code configured to scan said printed calibration test page to produce a bitmap image; a second set of code configured to process said bitmap image to produce a mis-registration score for each of said target regions; said second set of code further comprises code to blur said bit map image to produce a blurred bit map image; said second set of code further comprises code to threshold said blurred bitmap image to produce a binary black and white image and selecting said target region within said binary black and white image having the least amount of black pixels as a selected target region indicative of the least amount of moire patterns and the best mis-registration score; a third set of code configured to produce X and Y registration correction amounts for the second print head based upon the mis-registration scores; and a registration correction system configured to adjust the print data to the second print head based upon said X and Y registration correction amounts.