[1] Zou Y N, Yao G J. Median filtering algorithm for adaptive window shape[J]. Optics and Precision Engineering, 26, 3028-3039(2018).

[2] Buades A, Coll B, Morel J M. A non-local algorithm for image denoising. [C]//2005 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR'05), June 20-26, 2005, San Diego, CA, USA. New York: IEEE, 2, 60-65(2005).

[3] Buades A, Coll B, Morel J M. A review of image denoising algorithms, with a new one[J]. Multiscale Modeling & Simulation, 4, 490-530(2005).

[4] Gong C L. Image-denoising method based on wavelet transform and mean filtering[J]. Opto-Electronic Engineering, 34, 72-75(2007).

[5] Guo C L, Zhao X Y, Zheng H Y et al. Infrared image denoising method based on improved non-local means filter[J]. Infrared Technology, 40, 638-641(2018).

[6] Zhang N, Liu H, Shang Z H et al. Non-local means image denoising algorithm of improved weighting function[J]. Computer Engineering, 42, 254-261(2016).

[7] Zhu Y G, Zhang G M. Improved non-local means denoising algorithm[J]. Computer Engineering and Applications, 53, 192-198(2017).

[8] Li F Z, Zhao Y H, Xiang W et al. Infrared image mixed noise removal method based on improved NL-means[J]. Infrared and Laser Engineering, 48, S128001(2019).

[9] Froment J. Parameter-free fast pixelwise non-local means denoising[J]. Image Processing on Line, 4, 300-326(2014).

[10] Zou B Y, Liu H, Shang Z H et al. Non-local mean denoising algorithm based on local Hu moment[J]. Computer Engineering, 44, 241-244(2018).

[11] Duan Y Y, Chen W F, Feng Q J et al. Gradient-weighted SSIM based medical image quality assessment[J]. Computer Engineering and Applications, 47, 205-210(2011).