I am recently working on a new face detector for my company. It is so amazing so that I decided to try it on some cvdazzle images.
CvDazzle is an interesting project that they use makeup designs to cheat the face detection algorithms. Well it does work well on Viola Jones and some other state-of-the-art algorithms, including face++.
This is how a camouflaged face looks like:
… as well as how it is detected :P
And here are some more examples.
Well, It actually failed on the following picture. If you really want to hide your face from face detection algorithms, maybe this is how you should look like :P