Table 1 Quantitative comparison results on the SOTS outdoor datasets.

SOTS	Metrics	DCP	DCPDN	EPDN	AODNet	Grid	DA	MSBDN	PSD	Ours
Indoor	PSNR	19.95 dB	20.85 dB	25.09 dB	19.12 dB	32.16 dB	30.32 dB	32.67 dB	16.32 dB	30.92 dB
	SSIM	0.872	0.875	0.932	0.845	0.984	0.981	0.983	0.729	0.988
	LOE	227.94	331.51	258.30	266.54	188.55	247.55	168.34	320.59	131.10
	NIQE	4.385	4.801	4.618	4.106	4.231	4.830	4.839	3.8310	3.319
Outdoor	PSNR	20.44 dB	20.08 dB	20.31 dB	21.47 dB	16.21 dB	22.59 dB	23.16 dB	15.15 dB	23.38 dB
	SSIM	0.898	0.896	0.902	0.922	0.783	0.927	0.936	0.771	0.938
	LOE	205.45	148.121	338.77	277.79	337.83	116.72	72.19	314.94	53.60
	NIQE	3.1242	2.984	3.206	3.586	3.158	2.897	3.702	3.388	2.849
	Model Parameters	–	0.94 M	35.86 M	0.09 M	0.96 M	54.59 M	28.71 M	6.2 M	2.58 M

Number in bold, italics, and underline indicate the first, second, and third best results, respectively. DCP is a prior-based method without model parameters. Higher values of PSNR and SSIM; and lower values of LOE and NIQE represent better performance.

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