[1] Su Dingqiang, Cui Xiangqun, Wang Yanan, et al. Large-sky-area multi-object fiber spectroscopic telescope (LAMOST) and its key technology [C]//Proceedings of SPIE, 1998, 3352: 319250.
[2] Shuo Huang, Hua Zou, Liu Tianjiao, et al. An active flexure compensation method for LAMOST spectrograph based on BP-Neural network [J]. Research in Astronomy and Astrophysics, 2020, 20(3): 18-25.
[3] Zeng Haifei, Han Changpei, Li Kai, et al. Improved gradient threshold image sharpness evaluation algorithm [J]. Laser & Optoelectronics Progress, 2021, 58(22): 2211001. (in Chinese)
[4] Xiong Rui, Gu Naiting, Xu Hongyan. An auto-focusing evaluation function adapted to multi-directional gray gradient change [J]. Laser & Optoelectronics Progress, 2022, 59(4): 0418001. (in Chinese)
[5] Liu Bin, Qiao Qian, Zhang Zimiao, et al. 3D profile measurement based on depth from focus method using high-frequency component variance weighted entropy image sharpness evaluation function [J]. Infrared and Laser Engineering, 2021, 50(5): 20200326. (in Chinese) doi:  10.3788/IRLA20200326
[6] Li Chengchao, Yu Zhanjiang, Li Yiquan, et al. Sharpness evaluation of microscopic detection image for micro parts [J]. Semiconductor Optoelectronics, 2020, 41(1): 103-107, 113. (in Chinese)
[7] Xiang Kui, Gao Jian. Research on the image definition evaluation algorithm in autofocus process [J]. Modular Machine Tool & Automatic Manufacturing Technique, 2019(1): 52-55. (in Chinese)
[8] You Yuhu, Liu Tong, Liu Jiawen. Survey of the auto-focus methods based on image processing [J]. Laser & Infrared, 2013, 43(2): 132-136. (in Chinese)
[9] Hou Yonghui, Zhu Yongtian, Hu Zhongwen, et al. Performance and sensitivity of low-resolution spectrographs for LAMOST [C]//Ground-based and Airborne Instrumentation for Astronomy III, SPIE, 2010, 7735: 177-185.
[10] Xing Chengbin, Gong Shengsheng, Yu Xiaoliang, et al. Application of gaussian mixture clustering to moving surface fitting filter classification [J]. Infrared and Laser Engineering, 2021, 50(10): 20200501. (in Chinese) doi:  10.3788/IRLA20200501
[11] Tao Zhiyong, Liu Xiaofang, Wang Hezhang. Clustering algorithm of gaussian mixture model based on density peaks [J]. Journal of Computer Applications, 2018, 38(12): 3433-3437, 3443. (in Chinese)
[12] Shan Deqiang, Hu Chao, Liu Feifei. Threshold analysis and center point extraction of spot images [J]. Computer & Digital Engineering, 2020, 48(7): 1753-1756. (in Chinese)
[13] Zhang Jing, Wu Youyu. Locating algorithm of optical fiber spot center based on FPGA [J]. Laser Technology, 2017, 41(5): 769-774. (in Chinese)
[14] Pan Deng, Li Yanli, Gao Dong, et al. Center extraction method of multiple and overlapping faculae based on ellipsefitting [J]. Acta Optica Sinica, 2020, 40(14): 1410001. (in Chinese)
[15] Zhai YongPing, Zhou Dongxiang, Liu Yunhui, et al. Design of evaluation index for auto-focusing function and optimal function selection [J]. Acta Optica Sinica, 2011, 31(4): 0418002. (in Chinese) doi:  10.3788/AOS201131.0418002