Table 1.

Quantitative performance comparison of PL-LN and SDPL-LN.

	IQA Metrics	PL-LN	SDPL-LN
			GR	SD	PS
$\lambda$ = 40 $\delta$ = 0.1	PSNR(dB)	13.943	15.569	15.621	14.999
	SSIM	0.821	0.872	0.874	0.854
	VIF	0.404	0.540	0.547	0.531
	MAE	0.090	0.068	0.068	0.071
	RMSE	0.201	0.167	0.166	0.178
	MPE	36.651	30.396	30.216	32.459
$\lambda$ = 40 $\delta$ = 0.03	PSNR(dB)	15.475	17.133	17.232	16.856
	SSIM	0.869	0.910	0.912	0.905
	VIF	0.539	0.675	0.688	0.672
	MAE	0.069	0.051	0.050	0.052
	RMSE	0.168	0.139	0.138	0.144
	MPE	30.728	25.387	25.101	26.210
$\lambda$ = 20 $\delta$ = 0.15	PSNR(dB)	14.659	16.186	16.222	15.756
	SSIM	0.843	0.887	0.887	0.876
	VIF	0.474	0.593	0.598	0.590
	MAE	0.079	0.061	0.061	0.063
	RMSE	0.185	0.155	0.155	0.163
	MPE	33.754	28.311	28.194	29.748
$\lambda$ = 20 $\delta$ = 0.05	PSNR(dB)	16.001	17.543	17.601	17.151
	SSIM	0.882	0.919	0.920	0.913
	VIF	0.587	0.720	0.730	0.706
	MAE	0.063	0.047	0.046	0.050
	RMSE	0.159	0.133	0.132	0.139
	MPE	28.922	24.217	24.056	25.335