Below are links to some pdf's that provide additional detail about how the Digital Mona Lisa was produced back in 1964:

This link is to content from the December 1965 issue of Computers and Automation magazine, that featured the Digital Mona Lisa on the cover, and an article by it's producer H. Philip Peterson on some variables related to his production techniques.
Click Here to download the pdf file.

This link contains detailed information about the scanning and output equipment that was used to produce Digital Mona Lisa in 1964.
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This link is to the Computer History Museum website, located in Mountain View, CA and specifically to info about their copy of the Digital Mona Lisa or "Mona By The Numbers".
Click Here to visit their website

Ted Nelson, an early computer pioneer, coined the phrase/concept of "hypertext". His early computer book "Computer Lib/Dream Machines" outlined a vision for the future of technology and networks. He devoted a section in that book to discussing image processing, and highlighted the Digial Mona Lisa in it.
Click Here to visit this interesting website