Fig. 1. Numerical simulation experiment settings

Fig. 2. X-Z plane projection of surface luminescence fluxes obtained by the MC， DE and SP₃， respectively.

Fig. 3. Average errors of surface light energy obtained by MC and DE （SP₃） and the average errors after applying the spectral differential

Fig. 4. Cosine similarity of surface light energy obtained by MC and DE （SP₃） and the cosine similarity calculated by the difference of energy between each measured wavelength obtained by MC and DE （SP₃）

Fig. 5. Experimental results of source reconstruction