TABLE 6.

Comparison of mean relative absolute error (MRAE) (%) of different optimization methods under different tested exposure levels.

	Exposure ×1	Exposure ×0.25	Exposure ×0.5	Exposure ×2	Exposure ×4	Ave.	Std.
Zhang	1.85	47.56	16.61	5.09	6.94	15.61	18.69
Data augment	2.30	2.72	2.53	2.49	2.73	2.55	0.18
Ours	2.28	2.64	2.31	2.32	2.61	2.43	0.18

The bold values indicate the best results with the smallest spectral reconstruction errors.