Thread: Google uses anti-fraud tool to help digitize books
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Old 09-17-2009, 11:50 AM   #10
acidzebra
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Quote:
Scanned text is subjected to analysis by two different optical character recognition programs; in cases where the programs disagree, the questionable word is converted into a CAPTCHA. The word is displayed along with a control word already known. The system assumes that if the human types the control word correctly, the questionable word is also correct. The identification performed by each OCR program is given a value of 0.5 points, and each interpretation by a human is given a full point. Once a given identification hits 2.5 votes, the word is considered called. Those words that are consistently given a single identity by human judges are recycled as control words.
http://en.wikipedia.org/wiki/Recaptcha
http://arstechnica.com/old/content/2...anuscripts.ars
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