Table 2. Results based on LR-HR stage residual blocks. The Set 5 dataset is used for testing. SSIM is calculated with the aid of [25].

Proposed PSNR (dB) and SSIM results				VDSR [4]
ScaleLR-HR	17 - 3PSNR / SSIM	18 - 2PSNR / SSIM	19 - 1PSNR / SSIM	0 - 20PSNR / SSIM
× 2	37.5733 / 0.9588	37.5659 / 0.9588	37.0928 / 0.9513	37.53 / 0.9587
× 3	33.9024 / 0.9232	33.8976 / 0.9229	33.3120 / 0.9072	33.66 / 0.9213
× 4	31.5304 / 0.8865	31.5334 / 0.8859	30.8687 / 0.8622	31.35 / 0.8838
Average	34.34 / 0.9228	34.33 / 0.9225	33.76 / 0.9069	34.18 / 0.9213