Because PCNN has biological visual realistic basis,it is very suitable for image segmentation especially.This thesis mainly studies the facial image segmentation algorithm based on the model of PCNN.Simplified PCNN is used in the face image segmentation;it utilizes the gray feature of image and relativity of spatial information,and gets the neuron ignition sequence of image which becomes the result of image segmentation.The algorithm is emulated by MATLAB and the results shows that the algorithm has the eng...