Face detection using dlib library with 30 landmarks and calculate face area via regular polygon area formula
Skin detection using HSV & YCbCr colorspace with range:
0<=H<=17 and 15<=S<=170 and 0<=V<=255
0<=Y<=255 and 135<=Cr<=180 and 85<=Cb<=135
MTCCN Face detection with eyes, nose and mouth landmarks
