As far as I know, there is only one real method. OCR (preferably with ABBYY), edit the outcome either in a Word processor as ePUB to the fullest and correct *ALL* OCR errors including missing comma's and alike. Proofread the book at least 3 times and then you will have caught most errors.
Now, my Word add-in can help you a lot in catching OCR errors, but for sure not all (unless the source is superb, which it never is).
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