What is reCAPTCHA?

27 Sep 11

Dániel Varga

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29 Jun 10

Carol Furchner

interesting tool. Can also be used to hide email address on a web site, forcing someone to enter a captcha to see the full address.

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27 May 10

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17 Mar 10

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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.

15 Feb 10

Alexandre Enkerli

12 Feb 10

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05 Feb 10

Angela Rand

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03 Dec 09

Kit Dix-Pincott

A free CAPTCHA tool

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10 Nov 09

"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 kno

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04 Nov 09

Gregory Bruce

Also MailHide for secure mailto links that are protected by a captcha

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29 Oct 09

Robert Lavigne

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26 Sep 09

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04 Sep 09

Juho Makkonen

Ilmainen captcha, johon syötettyjä sanoja käytetään skannattujen kirjojen digitoimiseen.

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04 Aug 09

Kent Gerber

Technology that uses the smeared words that humans can discern and not computers to gain access to a website. These contribute to book digitization.

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07 Jun 09

Mali Anta

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17 May 09

Don Do

reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio shows. Check out our paper in Science about it (or read more below).

A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from "bots," or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs.

04 May 09

Chris Joseph

reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio shows. Check out our paper in Science about it (or read more below).

A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from "bots," or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs.

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30 Apr 09

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06 Apr 09

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10 Feb 09

Antonio Jozzolino

reCAPTCHA is a free CAPTCHA service that helps to digitize books, newspapers and old time radio shows. Check out our paper in Science about it (or read more below).

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27 Jan 09

Sean Brennan

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05 Jan 09

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27 Dec 08

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19 Nov 08

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reCAPTCHA is a free CAPTCHA service that helps to digitize books.

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23 Oct 08

James Houx

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06 Oct 08

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15 Aug 08

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12 Aug 08

Graham Mallinson

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09 Aug 08

Lefteris Chrysopoulos

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03 Jul 08

Abdul Qabiz

What an amazing idea? I love such projects.

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27 Jun 08

Jennifer Kelley

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23 Jun 08

Julian Knight

"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."

!!!! What can I say - sublime !!!!

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22 Jun 08

Sylvain ROUQUETTE

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14 Jun 08

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06 Jun 08

Guy Fawkes

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.

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20 May 08

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16 May 08

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24 Apr 08

John Smith

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16 Apr 08

Matthieu Calu

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15 Apr 08

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The harmonious union of captchas and book digitization.

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05 Nov 07

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19 Oct 07

Tobias Lee

"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."

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14 Oct 07

Chris Newton

The "official" version of Catpcha. Web service (but free) version of Captcha with API and PHP documentation for implementation.

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05 Oct 07

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03 Oct 07

Ian Yorston

Some 60 million CAPTCHAs are solved every day. Each takes about 10 seconds. But that aggregates to 150,000 hours of work each day. reCAPTCHA channels all that effort into "reading" old books. It does so by using any word that fails OCR as a new CAPTCHA.

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26 Sep 07

Wisely

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22 Sep 07

John Li

Digitizing Books One Word at a Time A CAPTCHA is a program that can tell whether its user is a human or a computer. You've probably seen them — colorful images with distorted text at the bottom of Web registrat

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19 Sep 07

Jaemi K

If you run a website that suffers from problems with spam, you can put reCAPTCHA on your site. For some applications such as Wordpress and Mediawiki , we have plugins that allow you to use reCAPTCHA without writing any code. We also have easy-to-use code

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18 Sep 07

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16 Sep 07

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14 Sep 07

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11 Sep 07

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09 Sep 07

eCAPTCHA is a a project to 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.

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07 Sep 07