Fig. 1. Basic principles of spectral imaging technology based on broadband filtering modulation

Fig. 2. Schematic of reconstructed spectrum and spectrum resolution

Fig. 3. Prototype structure of broadband filtering-based spectral imaging and spectral transmittance of filter set. (a) Prototype structure; (b) spectral transmittance

Fig. 4. Calibration light source and calibration process of principle prototype

Fig. 5. Spectral response of principle prototype and physical object of principle prototype. (a) Spectral response; (b) principle prototype device

Fig. 6. Imaging experiment process of standard light source with principle prototype

Fig. 7. Comparison between reconstructed spectrum and standard spectrum and their relative deviation. (a) Comparisoon between reconstructed and standard spectra; (b) relative deviation

Fig. 8. RGB image of target color card and reconstructed spectra of partial regions

Fig. 9. Reconstructed spectral images of target color card in different bands. (a) 600 nm; (b) 720 nm