Table 2. The PSNR(dB)/SSIM/R results of the MIP enface angiogram with different algorithms and protocols (The best results are highlighted).

	Scale	SSAPGA	DnCNN	U-Net	Pix2Pix	RDN
	4 inputs	14.62	17.31	20.00	20.43	$\mathbf{\text{22.14}}$
PSNR	3 inputs	14.16	20.16	19.27	19.72	$\mathbf{\text{20.89}}$
	2 inputs	13.27	17.44	$\mathbf{\text{20.82}}$	19.68	20.53
	4 inputs	0.527	0.702	$\mathbf{\text{0.714}}$	$\mathbf{\text{0.714}}$	0.712
SSIM	3 inputs	0.500	0.677	$\mathbf{\text{0.690}}$	0.685	0.686
	2 inputs	0.432	0.605	0.625	0.616	$\mathbf{\text{0.633}}$
	4 inputs	0.837	0.928	$\mathbf{\text{0.929}}$	$\mathbf{\text{0.929}}$	$\mathbf{\text{0.929}}$
R	3 inputs	0.815	0.918	$\mathbf{\text{0.922}}$	0.919	0.920
	2 inputs	0.763	0.898	0.899	0.895	$\mathbf{\text{0.901}}$