Fig. 1. True-color night vision system based on minus filters

Fig. 2. Relative current values of green lacquer and vert at photocathode under full moon condition

Fig. 3. Color wheels. (a) Color wheel 1; (b) color wheel 2

Fig. 4. Transmittance curves of filters that make up color wheels. (a) Color wheel 1; (b) color wheel 2

Fig. 5. Full-wave and sub-band images captured by method based on minus filters in experiment 1. Environmental illumination settings for 1-4 rows are 0.51, 0.12, 0.04, and 0.01 lx, respectively. (a) Full wave; (b) 582.4-700 nm; (c) 510.6-582.4 nm; (d) 380-510.6 nm

Fig. 6. R, G, and B sub-band images obtained by subtraction between full-wave image and sub-band images in experiment 1. Environmental illumination settings for 1-4 rows are 0.51, 0.12, 0.04, and 0.01 lx, respectively. (a) R; (b) G; (c) B

Fig. 7. R, G, and B sub-band images captured by method based on common narrow-band filters in experiment 1. Environmental illumination settings for 1-4 rows are 0.51, 0.12, 0.04, and 0.01 lx, respectively. (a) R; (b) G; (c) B

Fig. 8. Full-wave and sub-band images captured by method based on minus filters in experiment 2. (a) Full wave; (b) 582.4-700 nm; (c) 510.6-582.4 nm; (d) 380-510.6 nm

Fig. 9. R, G, and B sub-band images obtained by subtraction between full-wave image and sub-band images in experiment 2. (a) R; (b) G; (c) B

Fig. 10. R, G, and B sub-band images captured by method based on narrow-band filters in experiment 2. (a) R; (b) G; (c) B

Fig. 11. True-color night vision effect maps in experiment 1. Environmental illumination settings for 1-4 rows are 0.51, 0.12, 0.04, and 0.01 lx, respectively. (a) Traditional method based on minus filters; (b) method based on common narrow-band filters

Fig. 12. True-color night vision effect maps in experiment 2. (a) Traditional method based on minus filters; (b) method based on common narrow-band filters