[1] Yuan Yukai, Cheng Shidong, Pei Yuntian. Influence of defocus on automatic focusing evaluation function [J]. Opto-Electronic Engineering, 2005, 32(12): 51～58

[2] Y. L. Xing, S. A. Steven. Depth from focusing and defocusing［C］. Proceeding of IEEE Computer Society Conference on CV and PR, New York, 1993: 68～73

[3] M. Subbarao, G. Surya. Depth for defocus, a spatial domain approach [J]. International J. Computer Vision, 1994, 13(3): 271～294

[4] Zong Guanghua, Sun Minglei, Bi Shusheng et al.. Research on autofocus technique in micro-vision [J]. Acta Optica Sinica, 2005, 25(9): 1225～1232

[5] Sun Jie, Yuan Yuehui, Wang Chuanyong. Comparison and analysis of algorithms for digital image processing in autofocusing criterion [J]. Acta Optica Sinica, 2007, 27(1): 35～39

[6] Qu Yufu, Pu Zhaobang, Zhao Huijie et al.. Influence factor analysis of sensitivity of focus criteria function [J]. Acta Optica Sinica, 2005, 25(7): 902～906

[7] Ni Jun, Yuan Jiahu, Wu Qinzhang. Identification for optical image definition based on edge feature [J]. Chinese J. Lasers, 2009, 36(1): 172～176

[8] Song Kang, Zhang Tao, Liao Junbi. Theoretical analysis of autocorrelation function of image as sharpness evaluation function [J]. J. Southwest Jiaotong University, 2008, 43(5): 578～581

[9] Liu Yipeng, Pei Xiyu, Feng Huajun et al.. Autofocus algorithm based on depth from defocus [J]. Opitcal Instrument, 2005, 27(4): 39～44

[10] Pei Xiyu, Feng Huajun, Li Qi et al.. A depth from defocus auto-focusing method based on frequency analysis [J]. Opto-Electronic Engneering, 2003, 30(5): 62～65

[11] Li Qi, Feng Huajun, Xu Zhihai. Performance analysis and evaluation of point spread function for full digital autofocus [J]. J. Zhejiang University (Engineering Science), 2006, 40(6): 1093～1096

[12] F. Rooms, M. Ronsse, A.Pizurica et al.. PSF estimation with application in autofocus and image restoration [C]. Proc.3rd IEEE Benelux Signal Processing Symposium(SPS-2000), Leuven, Belgium, 2002, March 21-22, s02

[13] Wang Yuanyuan, Sun Zhimin, Cai Zheng. Estimation of PSF of image system using modified SVD method [J]. Optics and Precision Engineering, 2008, 14(3): 520～526

[14] Chen Qianrong, Lu Qisheng, Cheng Lizhi et al.. Identification of the point spread function from the defocus image using the Laplacian operators [J]. Computer Engineering & Science, 2005, 27(9): 40～43

[15] Zhao Lin, Jin Weiqi, Chen Yinan et al.. Blind restoration for defocus blurred image based on autocorrelation of derivative image [J]. Acta Optica Sinica, 2008, 28(9): 1703～1719