Large high resolution scans are kind of an art form, and definitely not easy from the technical aspect. Photographer/maker Charlie Romer took on creating a mega-scanner called Matrix Shot as a summer project.
This Arduino controlled camera is just what you need to make a high precision, large format mega scan. The idea is that the camera traverses the picture while taking many, many macro shots – one row at a time. Then those images are stitched together into one huge scan. With the D800 36MP per shot combined with a 200mm lens, the resulting image is a few 1000′s MB.
If you look closely at a sample scanned image you may notice a bunch of small yellow dots. HAD believes that those are Printer steganography used to determine the date and printer serial number (click for a bigger view)
While there is no one stop shop to get all the data, Charlie shares a few very informative videos, where he explains how the device works.