A Captcha is a type of test used in
computing wherein the response is not generated by a computer. The
process involves a server asking a user to complete a simple test.
It is described as a reverse Turning test, since it is administered
by a machine to a human.
The image above
is a CAPTCHA. Users can interpret it, but computers have a harder
time interpreting these letters. Google has acquired reCAPTCHA, a
company that creates these CAPTCHAs to help in protecting more than
100,000 websites from spam and fraud. Thus malicious programs
cannot scalp tickets or spam on millions of email accounts.
The image above is a CAPTCHA to test
whether you are human when you try to register on websites.
Scanning aid:
Google plans to use the technology
adopted by reCAPTCHA both as a security measure with in Google
sites and to make its large book-scanning project a smarter one.
When these CAPTCHAs come from books and newspapers, computers find
it hard to recognize these words because of the degradation in ink
and paper over time. Thus reCAPTCHA`s unique technology converts
these scanned images as plain text which is known as Optical
Character Recognition (OCR). Google Books and Google News Archive
Search websites will also use this technology. We can also easily
search for information, render information in mobile devices and
use the information for visually impaired persons when we have the
text version of the document.
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