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This is really interesting! I wonder if the amount of progress is reasonable. I assume the computer can also tell which bits need human help, so only a small percentage of the text actually uses the CAPTCHA input.
On the other hand, to be able to confirm the turing test results against known interpretation and also get new interpretation from the human, aren't you asking for more input than you would have to otherwise. It sounds like it is a regular turing test PLUS additional work to digitize the books. In other words, the trick seems to be that you have a captive audience to get more effort, not that you use existing effort.
So maybe they should be called "GOTCHAs"?!
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