TABLE 3.

Comparison of the spectral angle mapping (SAM) errors of different methods under different tested exposure levels.

	Exposure ×1	Exposure ×0.25	Exposure ×0.5	Exposure ×2	Exposure ×4	Ave.	Std.
Yan	1.47	24.98	15.71	3.66	5.68	10.30	9.85
Galliani	1.55	38.86	11.63	3.98	5.28	12.26	15.33
Zhang	1.29	26.52	10.98	3.63	4.99	9.48	10.17
HSCNN+	0.99	15.88	8.62	3.56	5.81	6.97	5.72
Ours	1.56	1.83	1.60	1.57	1.76	1.66	0.12

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