Table 6.

Comparison between different designs of residual data

Residual Data	RMSE	PSNR	SSIM
$z_0-z_2$	$26.9013\pm 4.1702$	$38.2671\pm 1.4324$	$0.9634\pm 0.0153$
$z_1-z_2$	$16.1408\pm 1.7620$	$42.6700\pm 1.0895$	$0.9817\pm 0.0037$