[1] Groen F C A，Yong I T，Lighthart G. A comparison of different focus functions for use in autofocus algorithms [J]. Cytometry(S1552-4922)，1985，6(2)：81-91.
[2] Pattern Analysis and Machine Intelligence(S0162-8828)，1998，20(8)：864-870.
Subbarao M，Tyan J K. Selecting the optimal focus measure for autofocusing and Depth-From-Focus [J]. IEEE Trans. on
[3] CHEN Guo-jin，ZHU Miao-fen，ZHANG Ke-song. Image definition evaluation function in auto-focusing process [J]. Journal of Data Acquisition & Processing(S1004-9037)，2009，24(2)：165-169.
[4] KANG Zong-ming，ZHANG Li，XIE Pan. Implementation of an automatic focusing algorithm based on spatial high frequency energy and entropy [J]. Acta Electronica Sinica，2003，31(4)：552-555.
[5] LI Qi，FENG Hua-jun，XU Zhi-hai. Method of improving autofocus speed based on defocus estimation [J]. Journal of Optoelectronics · Laser，2005，16(7)：850-853.
[6] ZHENG Yu-zhen. Optimized mountain-climb searching in auto-focusing [J]. Journal of Zhejiang University of Science and Technology，2005，17(3)：171-174.
[7] MIAO Li-gang ， XUAN Bo ， PENG Si-long. Fast autofocusing algorithm in microscopy [J]. Journal of Optoelectronics · Laser，2007，18(1)：9-12.
[8] Subbarao M，Nikzad A. Focusing techniques [J]. Optical Engineering(S0091-3286)，1993，32(11)：2824-2836.
[9] XIE Xiao-fu，ZHOU Jin，WU Qin-zhang. No-reference quality index for image blur [J]. Journal of Computer Applications，2010，30(4)：921-924.
