[1] [1] SHEN H L, ZHENG Z H, WANG W, et al.. Autofocus for multispectral camera using focus symmetry ［J］. Applied Optics, 2012, 51(14): 2616.

[2] [2] LU ZH H. The Automatic Image-based Real-time Focusing Research in Pushbroom Remote Sensing Camera ［D］. Changchun: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 2012. (in Chinese)

[3] [3] AN Y, QI Y CH. Design of straight-line focusing mechanism for space camera ［J］. Opt. Precision Eng., 2009, 17(3): 609-614. (in Chinese)

[4] [4] HIROKI S, OSAMU H. Theoretical study on self-calibration for the wide-range laser auto-collimation method ［J］. Key Engineering Materials, 2008, 381-382: 271-274.

[5] [5] WU H, ZHANG T, ZHANG ZH, et al.. System of aerial camera auto-focus based on defocus estimate by single image ［J］. Chinese Journal of Liquid Crystals and Displays, 2016, 31(5): 484-490. (in Chinese)

[6] [6] NINDL D, LIENHART W. Telescope for use in a measuring instrument and method of automated auto-collimation of a telescope of a measuring instrument with an auto-collimation target ［P］. EUR: EP 2461132 A1, 2012.

[7] [7] YUAN J H, CAI H B, LIU Q, et al.. Definition evaluation method for real-time auto-focusing of wide-angle telescope ［J］. Opt. Precision Eng, 2017, 25(5): 1368-1377. (in Chinese)

[8] [8] AUGUSTYN A T. The KS-146A long range oblique photography (LOROP) camera system ［C］. Technical Symposium, 1981: 76-85.

[9] [9] RUCK A R. Design versatility of the prism panoramic camera: the KS-116 and KA-95 cameras ［C］. 25th Annual Technical Symposium. International Society for Optics and Photonics, 1981: 69-75.

[10] [10] WANG ZH W, LUO X Q, ZHANG ZH CH. Quaternion wavelet transform for evaluation of image sharpness ［J］. Journal of Computer Application, 2016, 36(7): 1927-1932+1937. (in Chinese)

[11] [11] WANG Y Q, ZHU M. Maximum singular value method of quaternion matrix for evaluating color image quality［J］. Opt. Precision Eng., 2013, 21(2): 469-478. (in Chinese)

[12] [12] SANOJ K, SANJEEV K, NAGARAJAN S, et al.. Dual tree fractional quaternion wavelet transform for disparity estimation ［J］. ISA Transactions, 2014, 53(2): 547-559.

[13] [13] PETER F, STEPHEN J S. The development of the quaternion wavelet transform ［J］. Signal Processing, 2016, 136.

[14] [14] FAN C E, RAN J W, YAN J, et al.. No-reference image quality assessment using joint color space statistical and texture feature ［J］. Opt. Precision Eng., 2018, 26(4): 916-926. (in Chinese)

[15] [15] SAAD M A, BOVIK A C, CHARRIER C. Blind image quality assessment: a natural scene statistics approach in the DCT domain ［J］. IEEE Transactions on Image Processing, 2012, 21(8): 3339-3352.

[16] [16] LIU L, LIU B, HUANG H, et al.. No-reference image quality assessment based on spatial and spectral entropies ［J］. Signal Processing Image Communication, 2014, 29(8): 856-863.

[17] [17] MITTAL A, MOORTHY A K, BOVIK A C. No-reference image quality assessment in the spatial domain ［J］. IEEE Transactions on Image Processing A Publication of the IEEE Signal Processing Society, 2012, 21(12): 4695.