[1] CAI Wei, ZHANG Xin, FENG Xiuheng, et al. Compensating modes for zoom system[J]. Opt. Precision Eng, 2011, 19(9): 2063-2071.
[2] LI Hongzhuang, ZHANG Zhengduo, CAO Jingtai, et al. Design of Zoom Optical System with Long Focal Length and Super-high Zoom Ratio[J]. Acta Photonica Sinica, 2012, 41(3): 358-363.
[3] ZHOU Liping, SUN Zhijun, ZHANG Quan. Auto-focusing and control of micro-vision system[J]. Opt. Precision Eng, 2013, 21(3): 807-812.
[4] 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.
[5] MA Jianshe, LI Heyin, CHENG Xuemin, et al. Control system for embedded auto-focusing camera module[J]. Opt. Precision Eng, 2012, 20(10): 2222-2228.
[6] CHEN Fang, ZHANG Cunji, HAN Yanxiang, et al. Fast focus on simple images[J]. Opt. Precision Eng, 2014, 22(1): 220-227.
[7] Sikander S, Lee H N, Kim H J. Comparison between Photo Interrupter and Giant Magnetoresistive Sensor for Auto Focusing System in the Digital Camera [C]// Frontiers of Intelligent Autonomous Systems, Springer Berlin Heidelberg, 2013: 253-261.
[8] LUO Jun, SUN Li, MIN Zhisheng. Application of zoom tracking curves in focusing[J]. Opt. Precision Eng, 2011, 19(10): 2326-2332.
[9] ZOU Tengyue, TANG Xiaoqi, SONG Bao, et al. Robust Feedback Zoom Tracking for Digital Video Surveillance[J]. Sensors (S1424-8220), 2012, 12(6): 8073-8099.
[10] Murali Subbarao, Jenn-Kwei Tyan. Select the optimal focus measure for autofocusing and depth-from-focus[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence(S1628-8828), 1998, 20(8): 864-870.
[11] WANG Fengyu, WANG Rui, ZHANG Guangjun, et al. Auto-focusing system based on DSP[J]. Opto-Electronic Engineering, 2007, 34(8): 134-138.
[12] WANG Jianhua, DENG Huaqiu, CHEN Canning. Research on search algorithm for digital auto-focus[J]. Transducer and Microsystem Technologies, 2012, 31(5): 51-54.
[13] ZHANG Le, JIANG Wei, GAO Zan. Automatic focusing region selection algorithm based on first order of digital image[J]. Optical Technique, 2008, 34(2): 163-165.
[14] ZHU Kongfeng. An algorithm of focusing region selection for auto-focusing[J]. Journal of Anhui University: Natural Sciences, 2009, 33(2): 31-34.