dlib's face detection is the best of the open-source libs, in my experience. http://blog.dlib.net/2014/02/dlib-186-released-make-your-own-object.html http://bl

dlib's face detection is the best of the open-source libs, in my experience. http://blog.dlib.net/2014/02/dlib-186-released-make-your-own-object.html http://blog.dlib.net/2014/02/dlib-186-released-make-your-own... It's a brilliant piece of software for a number of things.