[dzdt]

I searched out the article: "Reading Chess", 1990, HS Baird and Ken Thompson. (Yes, that Ken Thompson).

http://doc.cat-v.org/bell_labs/reading_chess/reading_chess.p...

It doesn't actually quantify the human proofreading time. I might have recalled incorrectly; I heard about this in the late 1990's as a war story from another OCR researcher.

[PaulHoule]

It's an embarassing problem to have a system with "accuracy to high to measure"!