Shaosu HUANG, Wenming CHEN, Jian SHEN. Research on Low‑light‑level Imaging System Based on FPGA[J]. Optoelectronic Technology, 2022, 42(2): 112
- Optoelectronic Technology
- Vol. 42, Issue 2, 112 (2022)
Fig. 1. The structure of low-light imaging system
Fig. 2. The structure of low-light CMOS image sensor
Fig. 3. The diagram of sensor initialization and power-on sequence
Fig. 4. The flow chart of system online upgrade system
Fig. 5. The curves of GAMMA correction versus different parameters
Fig. 6. The images of low-light with illuminance of 0.1 lux(a) and 0.000 01 lux (b)
Fig. 7. Filter window
Fig. 8. Low-light images without processing and processed by 3×3,5×5,7×7 filter window
Fig. 9. The curves of correspondence between gray value before and after correction and gray correction value
Fig. 10. Low-light images of traditional median filter processing (a) and improved median filter processing (b)
Fig. 11. Low-light image test system
Fig. 12. Low-light camera placed on an optical rotating base
Fig. 13. Images collected by low-light night vision cameras under different illuminances with improved median filtering
Fig. 14. The relationship between resolution and environment illuminances
Fig. 15. Program A (a) with cable pull and program B with cable elimination (b)
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