Table 3.

Multi-scale resolution enhancement performance.

Method	Resolution scale	PSNR (dB)	SSIM	ArcFace Sim
CodeFormer	32 × 32 → 128 × 128	22.18	0.651	0.589
	64 × 64 → 128 × 128	24.73	0.742	0.671
DiffBIR	32 × 32 → 128 × 128	23.84	0.687	0.624
	64 × 64 → 128 × 128	26.18	0.768	0.694
OSDFace	32 × 32 → 128 × 128	23.12	0.668	0.607
	64 × 64 → 128 × 128	25.41	0.751	0.683
FADiff (Proposed)	32 × 32 → 128 × 128	25.71	0.731	0.681
	64 × 64 → 128 × 128	27.84	0.821	0.743