5Jianguo Wang, Tieniu Tan. A new face detection method based on shape information [J]. Pattern Recognition Letters 2000(21): 463 -471.
6N.Herodotou, K.N.Plataniotis, A.N.Venetsanopoulos. Automatic location and tracking of the facial region in color video sequences [J]. Signal Processing:Image Communication, 1999 (14): 359-388.