Are there any modern techniques of generating textual CAPTCHA (so person needs to type the right text) challenges which can easily fool AI with some visual obfuscation methods, but at the same time human can solve them without any struggle?For example I'm talking about plain ability of recognising text embedded into image (without considering any external plugins like flash or java, image classification, etc.) and re-typing the text that has been written or something similar.I guess adding noise, gradient, rotating letters or changing colours are not reliable methods any more, since they can be quickly broken.Any suggestions or research has been done?
Are there any textual CAPTCHA challenges which can fool AI, but not human?
image recognition;research;ocr
It's an interesting question about what makes humans unique. There is a good book on the subject titled What Computers Cant Do by Hubert Dreyfus.One task that a computer can't handle (for now at least) is ranking important things. For example, CAPTCHA asks you to order a random list of things (small one, five or six items) by importance. This particular exercise requires AI to take decisions (not always rational) based on human judgement.