Questions tagged [captcha]

For questions related to CAPTCHA, an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart", which is a type of challenge-response test used in computing to determine whether or not the user is human.

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Is such a captcha AI-resistant?

Let's say we have a captcha system that consists of a greyscale picture (of a part of a street or something akin to re-captcha), divided into 9 blocks, with 2 missing pieces. You need to choose the ...
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How to prevent image recognition of my dataset with neural networks and make it hard to train them?

Suppose I have a private set of images containing some objects. How do i Make it very hard for the neural networks such as ImageNet to recognize these objects, while allowing humans to do it at the ...
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How is the reCaptcha useful for Google?

I am wondering where Google uses the result from deep learning of reCaptcha (how can a system that knows to recognize street signs is useful somewhere? how they profit from it?)