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)
