i t ?Captures are an extremely annoying system if they are insanely hard.
Other tests are more friendly, such as a text line that reads something like "are you human, if so spell it!" where you have to type in human.
Over 200 million CAPTCHAs are solved every day by people around the world. reCAPTCHA channels this human effort into helping to digitize books and newspapers. When you solve a reCAPTCHA, you help preserve literature by deciphering a word that was not readable by computers.
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.
Pretty smart eh?
Captures are an extremely annoying system if they are insanely hard.
Other tests are more friendly, such as a text line that reads something like "are you human, if so spell it!" where you have to type in human.
Might be a good idea to have the audio clip hints that some websites have too