Table 1.

Correlation of selected DB and NR image quality metrics with MOS

	FID64	FID192	FID768	FID2048	KID	NIQE	NIQE_M	BRISQUE
SROCC	−0.3768	−0.4235	−0.7666	−0.7823	−0.8271	0.6346	−0.5416	0.032
LCC	−0.699	−0.6894	−0.7872	−0.7813	−0.8099	0.5955	−0.5804	−0.0446

Note: FID and KID metrics assess image quality, with lower values indicating better quality. NIQE and BRISQUE are no-reference image quality evaluators; lower NIQE scores suggest better perceptual quality, whereas BRISQUE evaluates image naturalness. SROCC and LCC measure the correlation between objective metrics and subjective MOS ratings. SROCC and LCC values closer to −1 or 1 indicate a strong correlation, with positive values suggesting a direct relationship and negative values an inverse relationship.