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Ursprungligen postat av goose (Inlägg 20365551)

Det är två ord i recaptcha. Det ena är kontrollordet och det andra hjälper till att digitalisera böcker.

NJae...

Orden har ett av 3 status.
Okänt, Kontroll eller Känt.

reCaptcha fungerar som så att det ena ordet är Känt och det andra har något av dom andra 2. Kontrollen sker som så att klarar man det Kända ordet så förutsätter reCaptcha att du fyllt i det hela korrekt och släpper igenom dig.

Källa: http://www.google.com/recaptcha/learnmore

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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. More specifically, each word that cannot be read correctly by OCR is placed on an image and used as a CAPTCHA. This is possible because most OCR programs alert you when a word cannot be read correctly.

But if a computer can't read such a CAPTCHA, how does the system know the correct answer to the puzzle? Here's how: Each new word that cannot be read correctly by OCR is given to a user in conjunction with another word for which the answer is already known. The user is then asked to read both words. If they solve the one for which the answer is known, the system assumes their answer is correct for the new one. The system then gives the new image to a number of other people to determine, with higher confidence, whether the original answer was correct.