As TFA says, the hard part is that "1" and "l" look the same in the selected typeface. Whether your OCR is done by computers or humans, you still have to deal with that problem somehow. You still need to do the part sketched out e.g. by pyrolistical in [1] and implemented by dperfect in [2].

[1] - https://news.ycombinator.com/item?id=46906897

[2] - https://news.ycombinator.com/item?id=46916065