A Contourlet-Based Face Detection Method in Color Images

The first step of any face processing system is detecting the location in images where faces are present. In this paper we present an upright frontal face detection system based on the multi-resolution analysis of the face. In this method firstly, skin-color information is used to detect skin pixels in color images; then, the skin-region blocks are decomposed into frequency sub-bands using contourlet transform. Features extracted from sub-bands are used to detect face in each block. 4 multi-layer perceptrone (MLP) neural network was trained to do this classification. To decrease false positive detection we use eyes and lips template matching. These templates achieved by averaging corresponding parts in LL sub-band of contourlet decomposition. Experimental results show that the proposed algorithm is effective and efficient in detecting frontal faces in color images.