Fig. 4: Spectral reconstruction in visible, near, and mid-infrared wavelength ranges.
a Reconstruction of narrowband spectra in the visible wavelength range (400 nm to 700 nm with 1 nm spectral channel spacing). The center-wavelength ranges from 500 nm to 600 nm with 10 nm spacing. The black dashed lines represent the reference spectra measured by a commercial spectrometer, while the colored solid lines are the reconstructed spectra. The average MSE is 1.05 × 10-3. b, c The center-wavelength error and linewidth error distributions for narrowband spectra reconstruction. The average errors are 0.61 nm and 0.56 nm, respectively. d–f Reconstruction of broadband spectra. The broadband spectra are the absolute transmittance of color filters. The black dashed lines represent the reference spectra measured by a spectrophotometer, and the red/blue solid lines are the reconstructed spectra using experimental/ calculated intensities. The MSEs are 2.89 × 10-3, 1.92 × 10−4, and 1.10 × 10-2 using the experimental intensities, whereas the MSEs decrease to 9.25 × 10-3, 1.25 × 10−4, and 1.61 × 10-3 using the calculated intensities. g–i Simulative reconstruction of broadband spectra in the near-infrared wavelength range (700 nm to 1600 nm with 3 nm spectral channel spacing). The black dashed lines represent the reference spectra, while the red solid lines are the reconstructed spectra. The MSEs are 5.31 × 10-3, 7.21 × 10−5, and 6.08 × 10-3, respectively. j–k Reconstruction of broadband spectra in the mid-infrared wavelength range (3 μm to 5 μm with 5 nm spectral channel spacing). The MSEs are 6.81 × 10-3 and 3.78 × 10-3 using the experimental intensities, whereas the MSEs decrease to 1.06 × 10-3 and 1.84 × 10-3 using the calculated intensities. l Simulative reconstruction of narrowband spectra with 10 nm linewidths. The average MSE is 3.36 × 10−4.
