Table 3.

Quantitative image quality evaluations with and without residual learning using PSNR (unit: dB)

Image patch size	Artifact-insert	Ordinary-learning	Residual learning
25 × 25	25.38	33.71	33.83
50 × 50	25.38	37.79	38.09
100 × 100	25.38	36.68	36.80