| Author: | Stefano |
|---|---|
| category: | Administrative |
I added reCaptcha to the comments. reCaptcha is a Captcha system, one of those systems that tries to understand if you are a human or an automatic program (a bot, normally for spamming). This normally consist in asking you to type the letters from an image, a task that a human can do easily, but a computer can't. Optical Character Recognition (OCR) methods could potentially be used by a program who tries to eavesdrop the system, but they are not very accurate, in particular if the text is highly distorted, or noise is added to the image.
reCaptcha puts the concept to another level. It exploit the many small human contributions put into solving captchas to digitize books. Therefore, the more comments you write, the faster those books are converted into digital form.