ReCAPTCHA 是如何工作的？
我对这篇文章的阅读表明，ReCAPTCHA 的好处是它可以人类验证书籍 OCR/数字化中无法识别的单词。它通过使用“你是人类吗？”中的这些词来做到这一点。测试。所以 ReCAPTCHA 一石二鸟。伟大的！
但我不明白。如果数字化过程无法识别该单词，那么假设的人类输入的输入是根据什么进行验证的？这是如何运作的？
My reading of this article suggests that a benefit of ReCAPTCHA is that it can have humans verify words not recognised in the OCR/digitization of books. It does this by using these words in "Are you human?" tests. So ReCAPTCHA kills two birds with one stone. Great!
But I dont get it. If the word can't be recognised by the digitization process then what is the input entered, by the supposed human being, verified against? How does this work?
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它显示两个字。其中之一计算机已经知道，而另一个则不知道。它假设如果你正确地了解了已知的一个，那么你也必须了解另一个。
你不知道这两者中的哪一个是已知的，所以理论上你无法欺骗它。此外，它还会与多人重播一个单词以获得独立确认，然后将其作为有效答案发送回源（报纸公司、书籍扫描组）。
http://recaptcha.net/learnmore.html
It shows two words. One of them the computer already knows, the other, it doesn't. It assumes that if you get the known one right, that you must know the other.
You don't know which of the two is already known so you, theoretically can't trick it. Additionally, it will replay a word with multiple people to get independent confirmation before sending it back to the source (newspaper company, book scanning group) as a valid answer.
http://recaptcha.net/learnmore.html
引自了解 reCAPTCHA 的工作原理
Quoted from LEARN HOW reCAPTCHA WORKS