References: =========== [1] P. Felzenszwalb, R. Girshick, D. McAllester, D. Ramanan. "Object Detection with Discriminatively Trained Part Based Models." IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 32, No. 9, September 2010. [2] P. Felzenszwalb, etc "Cascade Object Detection with Deformable Part Models" URL: http://people.cs.uchicago.edu/~pff/latent/