Face tracking using a pan-tilt unit

I spend some time as a student programmer during my education for my M.Sc. in Robot System Engineering and as a research assistant after my graduation working on/finishing up a project for tracking a human face with a wide field of view camera using a pan-tilt unit to align a high-resolution stereo camera for face verification. A paper was accepted to VISAPP 2014:
Enhanced 3D face processing using an active vision system