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.