Using Optical Character Recognition (OCR) Software with CAT Tools
http://www.languagepartners.com/reference-center/whitepapers/genwp/ocrart.htm

SDL International

Abstract:

The function of OCR Software is to improve the scanning process with the transfer of hard copy documents into workable electronic text. Despite some high quality OCR software packages now available, the scanning process is still not perfect. This imperfection can greatly diminish from the performance of your CAT tool if it is not properly addressed. When combining these two processes (scanning and translation via CAT tools), it is important that you know which OCR software package to use and exactly how to use it most effectively. In fact, if you do not have the proper OCR software, or if you are using your OCR software incorrectly, you may actually negate the potential benefits that your translation software can offer.