[1] [1] Zhang Laixian, Sun Huayan, Guo Huichao, et al. Auto focusing algorithm based on largest gray gradient summation[J]. Acta Photonica Sinica, 2013, 42(5): 605-610. (in Chinese)

[2] [2] Mei Gui, Zhai Yan, Miao Jianyu, et al. Focal plane alignment and testing for an off-axis multispectral space borne camera[J]. Chinese Optics, 2016, 9(4): 491-500. (in Chinese)

[3] [3] Wu X, Hu S, Zhao J, et al. Analysis of comparative different methods for image enhancement[J]. Journal of Central South University, 2014, 21(12): 4563-4570.

[4] [4] Wang Hao, Zhang Ye, Shen Honghai, et al. Review of image enhancement algorithms[J]. Chinese Optics, 2017, 10(4): 438-448. (in Chinese)

[5] [5] Xu Chao, He Limin, Wang Xia, et al. Design of high speed processing module for infrared polarization imaging system[J]. Infrared and Laser Engineering, 2017, 46(2): 0204002. (in Chinese)

[6] [6] Wang Yeru, Feng Huajun, Xu Zhihai, et al. An adjustable coverage range autofocus evaluation function using gradient operator with on variable frequency[J]. Infrared and Laser Engineering, 2016, 45(10): 1028001. (in Chinese)

[7] [7] Liu S, Liu M, Yang Z. An image auto-focusing algorithm for industrial image measurement[J]. Eurasip Journal on Advances in Signal Processing, 2016, 2016 (1): 70.

[8] [8] Qi Y, He R, Lin H. Novel infrared image enhancement technology based on the frequency compensation appr-oach[J]. Infrared Physics & Technology, 2016, 18(76): 521-529.

[9] [9] Zhao Wenda, Xu Zhijun, Zhao Jian, et al. Enhancement of infrared image details based on gradient histogr-am transform[J]. Opt Precision Eng, 2014, 22(7): 1962-1968. (in Chinese)

[10] [10] Li Ke, Zhang Kangwei, Luo Miao. Design on optical system of large plane array and high resolution multi-spectral imager based on LCTF[J]. Infrared and Laser Engineering, 2013, 42(3): 675-679. (in Chinese)

[11] [11] Huang Detian, Liu Xuechao, Zhang Hongsheng, et al. Fast auto-focusing method based on human visual system[J]. Chinese Journal of Liquid Crystals and Displays, 2014, 29(5): 768-776. (in Chinese)

[12] [12] He Zhiyong, Sun Lining, Chen Liguo. Fast computation of threshold based on Otsu criterion[J]. Acta Electronic Sinica, 2013, 41(2): 267-272. (in Chinese)

[13] [13] Zhou Qiang, Zhao Jufeng, Feng Huajun, et al. Infrared image enhancement using polarization imaging[J]. Infrared and Laser Engineering, 2014, 43(1): 39-47. (in Chinese)

[14] [14] Qin Hanlin, Zhou Huixin, Liu Shangqian, et al. Nonlinear enhancement algorithm for infrared image based on second generation wavelet transform[J]. Acta Optica Sinica, 2009, 29(2): 353-356. (in Chinese)

[15] [15] Li Qingzhong, Liu Qing. Adaptive enhancement algorithm for low illumination images based on wavelet transform[J]. Chinese Journal of Lasers, 2015, 42(2): 0209001. (in Chinese)

[16] [16] Ge Wei, Li Guiju, Cheng Yuqi, et al. Face image illum-ination processing based on improved Retinex[J]. Opt Precision Eng, 2010, 18(4): 1011-1020. (in Chinese)

[17] [17] Chu Xiang, Zhu Lianqing, Meng Xiaochen, et al. Quick focusing method in bionic vision based on the liquid lens[J]. Laser and Infrared, 2017, 47(2): 203-209. (in Chinese)