关键词: 四元数, 多级非抽样Contourlet变换, 奇异值, 神经网络, 彩色人脸识别

Abstract: In this paper, color face image is represented in quaternion real matrices. The coefficients in different scales and directions are obtained by image decomposition using the nonsubsampled contourlet transform. Singular value vector compressed is extracted as the color face image feature, and then the back propagation neural network is used to training and recognition. The experiment indicates that the recognition rate of the proposed method in this paper is improved and it is an effective color face image recognition method．

Key words: quaternion, Nonsubsampled Contourlet（NSCT） transform, singular values, neural network, color face recognition