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. 2019 Jul 8;2:7. doi: 10.1186/s42492-019-0016-7

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 3 — Visual comparisons of denoising results on Boat image corrupted by additive white Gaussian noise with standard deviation 50: a TV-based regularization [28] (PSNR = 22.95 dB; SSIM = 0.456); b NLM [38] (PSNR = 24.63 dB; SSIM = 0.589); c R-NL [56] (PSNR = 25.42 dB; SSIM = 0.647); d NCSR model [66] (PSNR = 26.48 dB; SSIM = 0.689); e LRA_SVD [78] (PSNR = 26.65 dB; SSIM = 0.684); f WNNM [58] (PSNR = 26.97 dB; SSIM = 0.708)