[1] CHEN G J, ZHU M F, ZHANG K S. Image definition evaluation function in auto-focusing process[J]. Journal of Data Acquisition Processing, 2009,24(2):165-169(in Chinese).
[2] SUN J, YUAN Y H, WANG Ch Y. Comparison and analysis of algorithms for digital image processing in autofocusing criterion[J]. Acta Optica Sinica, 2007, 27(1):35-39 (in Chinese).
[3] LI M M, WANG X S, LI J. Comparative study on the auto-focus definition function based on the image processing[J]. Infrared and Laser Engineering,2010, 39(s1):244-248(in Chinese).
[4] ZHOU X, JIANG W. Auto-focus algorithm based on image edge ener- gy[J]. Acta Optica Sinica, 2006,32(2):213-215(in Chinese).
[5] ZHENG J, ZHANG Q G, WANG P. An improved autofocus searching algorithm and its implementation[J]. Computer Development Applications, 2010,23(1):26-27(in Chinese).
[6] ZHENG Y Zh. Optimized mountain -climb searching in auto-focusing[J]. Journal of Zhejiang University of Science and Technology, 2005,17(3):171-174(in Chinese).
[7] PANG Sh L. Research on image blur assessment [D]. Xi'an: Xidian University, 2010:62-120(in Chinese).
[8] HUANG Q M. Research for digital image processing method based on ambiguity[D]. Wuhan: Wuhan Polytechnic University, 2007:64-139 (in Chinese).
[9] WANG Z L, CHANG J, JIANG X Y, et al. Optimized method for space requirements based on histogram equalization[J]. Laser Technology, 2012,36(3):307-311(in Chinese).
[10] YOUNG K K, JUNE S L, YOU Y J, et al. An advanced camera system having fast auto-focus control[C]//International Conference on Consumer Electronics. New York,USA:IEEE, 2001: 210-211.
[11] SU P, NIU Y X,LI D Q, et al . Image acquisition and processing of a laser warning system based on planar array CCD[J].Laser Technology,2013,37(3):394-399(in Chinese).
[12] YU Ch H, JIANG X B, ZHANG Ch. Design of a camera auto-focusing system based on DSP technology[J]. Journal of Shenyang Aerospace University, 2012,29(4):68-71(in Chinese).