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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. 4 — Visual comparisons of denoising results on Monarch image corrupted by additive white Gaussian noise with standard deviation 75: a BM3D [55] (PSNR = 23.91 dB); b WNNM [58] (PSNR = 24.31 dB); c DnCNN [106] (PSNR = 24.71 dB); d FFDNet [107] (PSNR = 24.99 dB)