[11] JARVIS R A. Focus optimization criteria for computer image processing［J］. Microscope, 1976, 24(2): 163-180.
[12] HORN B K P. Focusing: technical report AIM-160［R］. Cambridge: Massachusetts Institute of Technology, 1968.
[14] KAUTSKY J, FLUSSER J, ZITOVA B, et al. A new wavelet-based measure of image focus［J］．Pattern Recognition Letters, 2002, 23(14): 1785-1794．
[15] TIAN J, CHEN L.Adaptive multi-focus image fusion using a wavelet-based statistical sharpness measure［J］. Signal Processing, 2012, 92(9): 2137-2146.
[16] LIU Y P, JIN J, WANG Q, et al. Phases measure of image sharpness based on quaternion wavelet［J］. Pattern Rec-ognition Letters, 2013, 34(9): 1063-1070．
