“…Feature extraction is one of the key links of pattern recognition technology [13,14,15]. At present, the common methods of feature extraction in human ear recognition include PCA (Principal Component Analysis) [16,17,18], independent component analysis (ICA) [19,20,21],two-dimensional principal component analysis (2DPCA) [22,23],Fisherface [31,32,33], and Fisher linear discriminant [24,25].However, these methods of single feature extraction can only get a high recognition rate under certain circumstances.Otherwise the recognition effect is not good. Hence, the method of complementary double feature is a way to improve the recognition rate.…”