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Comparison of spectral angle mapping (SAM) errors of different optimization methods under different tested exposure levels.
| Exposure ×1 | Exposure ×0.25 | Exposure ×0.5 | Exposure ×2 | Exposure ×4 | Ave. | Std. | |
| Zhang | 1.29 | 26.52 | 10.98 | 3.63 | 4.99 | 9.48 | 10.17 |
| Data augment | 1.57 | 1.84 | 1.72 | 1.71 | 1.86 | 1.74 | 0.12 |
| 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.
