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Table 2: P values for image-quality metric comparisons between images enhanced with S and NS input^{^a}
Method/Metric PSNR SSIM RMSE
Method 1 0.27 0.26 0.15
Method 2 0.99 0.62 0.83
Method 3 1.00 0.79 0.67
Note:—PSNR indicates peak SNR; SSIM, structural similarity; RMSE, root-mean-square error
↵a The metrics across subjects are graphed in Fig 4.
Method/Metric	PSNR	SSIM	RMSE
Method 1	0.27	0.26	0.15
Method 2	0.99	0.62	0.83
Method 3	1.00	0.79	0.67