Table 2.

The quality of reconstructed images different upsampling ratios.

k	PSNR	SSIM	RMSE
1	21.5 dB	0.308	0.0839
2	34.4 dB	0.924	0.0191
4	38.8 dB	0.979	0.0115
8	42.6 dB	0.987	0.0074