Fig. 1. Schematic diagram of binary image superposition

Fig. 2. Output curves of gray value quasi-logarithmic response

Fig. 3. Schematic diagram of experimental device

Fig. 4. Illuminance distribution of black strip on experimental target board

Fig. 5. Camera images and gray distributions for illuminance value of 100--3000 lx of black strip. (a) Binary superposition camera; (b) traditional camera

Fig. 6. Camera images and gray distributions for illuminance value of 600--14000 lx of black strip. (a) Binary superposition camera; (b) traditional camera

Fig. 7. Variation of gray difference Δ with coordinate x for illuminance intensity of 100--3000 lx on black strip

Fig. 8. Variation of gray difference Δ with coordinate x for illuminance intensity of 600--14000 lx on black strip

Fig. 9. Comparison of brightness integral value curves for illuminance intensity of 49--1365 lx on black strip