From the reCAPTCHA website:
“reCAPTCHA improves the process of digitizing books by sending words that cannot be read by computers to the Web in the form of CAPTCHAs for humans to decipher.”
I have seen and used this ‘brand’ of CAPTCHAs many times – but I had no idea that they were using them as a form of human OCR. Incredible.
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