Fig. 1. The structure and principle of the snapshot spectral imager based on microlens array

Fig. 2. Schematic diagram of geometrical optical principle of microlens imaging on the image plane of objective lens

Fig. 3. 2D structure of the objective lens

Fig. 4. The spot diagram of the objective lens

Fig. 5. The MTF curve of the objective lens

Fig. 6. The distortion of the objective lens

Fig. 7. The structure and imaging statue of the objective lens and microlens

Fig. 8. The image before and after the microlens array

Fig. 9. The 2D structure of the double amici prism and imaging spectrometer

Fig. 10. The MTF curve of the imaging spectrometer at different wavelengths

Fig. 11. The footprint of the imaging spectrometer

Fig. 12. The overlap of the spectrum generated by different microlens

Fig. 13. Simulation result of the whole system

Fig. 14. The key components of the whole system

Fig. 15. The structure of the snapshot hyperspectral imager based on microlens array

Fig. 16. The image composed of the data obtained by the system

Fig. 17. The pre-processing result of the data and determined center of microlens

Fig. 18. The calibration data and result

Fig. 19. Spectrum of mercury lamp and its gauss fit result

Fig. 20. The object used to measure spatial resolution and the image obtained by the system

Fig. 21. The true object and the origin data obtained by the system

Fig. 22. Monochromatic images of different spectral channels

Fig. 23. The spectrum and reflectance obtained by the system

Fig. 24. Comparison of the reflectance obtained by the commercial spectrometer and established system