Table 4.

Ablation Study on FADiff Components (WIDER-FACE Hard Subset).

Configuration	PSNR (dB)	SSIM	ArcFace Sim	Detection AP@0.5	Δ PSNR	Δ Detection AP
Diffusion only	23.42	0.693	0.618	0.471	− 4.42	− 0.141
w/o FCEM	25.18	0.756	0.652	0.548	− 2.66	− 0.064
w/o FAIE	24.91	0.741	0.679	0.523	− 2.93	− 0.089
w/o MLP-Mixer in FCEM	26.73	0.798	0.719	0.587	− 1.11	− 0.025
w/o residual refinement	26.41	0.789	0.731	0.578	− 1.43	− 0.034
FADiff (Full)	27.84	0.821	0.743	0.612	–	–