i came across this wonderful site which has dual purpose, providing free CAPCHA service to small websites and digitizing old text books.
http://recapcha.net
OCR means optical character recognition. recognizing text inside an image as electronic text.
CAPCHA is the image code that comes in registration form while opening new email account and the person has enter the letter contained in that image.
OCR is basically used to convert scanned documents into electronic text. however, this algorithm is not 100% perfect. when OCR fails, RECAPCHA does the trick by asking humans to recognize difficult to read words
RECAPCHA is a free service, can be used for timepass, their api can be used in any site to improve authentication level.
simple is example is that of a blog which is littered by spam comments. to stop this, recapcha can be used.
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