reCAPTCHA
CAPTCHA är en teknik för att verifiera att någon som t.ex. registrerar sig på en webbsida inte är en maskin som bara är ute efter att spamma, utan en riktig person.
reCAPTCHA tar det hela ytterliggare en nivå:
reCAPTCHA supplies subscribing websites with images of words that optical character recognition (OCR) software has been unable to read. The subscribing websites (whose purposes are generally unrelated to the book digitization project) present these images for humans to decipher as CAPTCHA words, as part of their normal validation procedures. They then return the results to the reCAPTCHA service, which sends the results to the digitization projects. This provides about the equivalent of 160 books per day, or 12,000 manhours per day of free labor.
Riktigt smart!
