If you have the pro version of Acrobat it does this
quite well from the
PDF
but be sure to select the ClearScan option - its
remarkably good compared
to traditional OCR methods.
Thanks to everyone who has replied with suggestions. Another suggestion I
got is to try Omnipage, so I got myself a 15-day trial version of Omnipage
Pro. It allows you to draw a rectangle on the page, then select "Numeric
data". It will then only perform OCR on that part of the page, and will try
to recognize everything as a number. When in doubt, it will bring up a
dialog with a detailed view of the problematic page so you can make manual
corrections. Combined with a bit of manual work to fix things up, this seems
to work fairly well.
Cheers,
Camiel