Fig. 1. Optical system for temporally and spatially modulated interferometric spectral imager

Fig. 2. Data processing flow of interferometric spectral imager

Fig. 3. VMD flowchart

Fig. 4. DWT flowchart

Fig. 5. The joint filtering method flow of VMD-DWT

Fig. 6. Experiment on hyperspectral imager of HJ-2A

Fig. 7. Original interferogram

Fig. 8. Interferogram after data error correction

Fig. 9. Error in the correction of the interferogram

Fig. 10. Interference curve after data error correction

Fig. 11. Fitting filter effect

Fig. 12. Fitting filter spatial dimension 1 024 columns

Fig. 13. EMD filtering effect

Fig. 14. EMD filtering spatial dimension 1024 columns

Fig. 15. EMD endpoint effects and modal aliasing

Fig. 16. VMD filtering effect

Fig. 17. VMD filtering spatial dimension 1024 columns

Fig. 18. IMF component frequency domain

Fig. 19. VMD-DWT joint filtering effect

Fig. 20. VMD-DWT joint filtering spatial dimension 1 024 columns

Fig. 21. Four filtering methods for restoring spectral spatial dimension SNR and RQE