Ideas are simple but they are powerful. Here is a story of a such idea, the idea of using "Captcha". If you don't know what a Captcha is, don't be worried. I'll explain it later in this article.
I'd heard this story from a radio about "WHAT IT DOES" but didn't know "HOW IT DOES". Today I read the HOW part and thus want to share to everyone.
What is a CAPTCHA ?
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.
What is RECAPTA ?
It is a free CAPTCHA service used to digitize books, news paper etc.
How does RECAPTA help in digitizating documents ?
OCR is a device used to digitize a document. The problem is that the device cannot digitize all the words in the document correctly. It informs if it cannot digitize the words. A word which is not digitized by OCR is mixed with a known word and a new captcha is formed. The new captcha is challenged to human. Those who type the known word correctly are believed to type the word to be digitized correctly. To make it perfect, the new captcha is challenged against many people. By this way the confidence of the word to be digitized is improved.
Therefore, the idea is simple but powerful !
Reference:
Recapta
I'd heard this story from a radio about "WHAT IT DOES" but didn't know "HOW IT DOES". Today I read the HOW part and thus want to share to everyone.
What is a CAPTCHA ?
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.
What is RECAPTA ?
It is a free CAPTCHA service used to digitize books, news paper etc.
How does RECAPTA help in digitizating documents ?
OCR is a device used to digitize a document. The problem is that the device cannot digitize all the words in the document correctly. It informs if it cannot digitize the words. A word which is not digitized by OCR is mixed with a known word and a new captcha is formed. The new captcha is challenged to human. Those who type the known word correctly are believed to type the word to be digitized correctly. To make it perfect, the new captcha is challenged against many people. By this way the confidence of the word to be digitized is improved.
Therefore, the idea is simple but powerful !
Reference:
Recapta
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