There are many face detection and recognition algorithms and APIs out there; however, most of them can produce same results for paintings and avatars as for human face. So, is there any specific algorithm or tool to distinguish real human face and a simulated/fabricated one?

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    $\begingroup$ Yeah, sure, you could just train something to tell human faces from painted ones; there's actually quite a lot of literature of making and breaking (video download contains english translated audio track) biometric systems. Can you be more specific? $\endgroup$ – Marcus Müller Jan 2 at 12:24
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    $\begingroup$ Good question. You're basically asking for the error function of face generation. If you can reduce that enough, the generated faces will be indistinguishable from real ones. $\endgroup$ – MisterGeeky Jan 3 at 13:18

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