Digital TDI Technology Based on Global Shutter sCMOS Image Sensor for Low-Light-Level Imaging

Yuantao Zhang; Mengyang Chai; Dexin Sun; Yinnian Liu

doi:10.3788/AOS201838.0911001

Acta Optica Sinica, Volume. 38, Issue 9, 0911001(2018)

Digital TDI Technology Based on Global Shutter sCMOS Image Sensor for Low-Light-Level Imaging

Yuantao Zhang^1,2,3、*, Mengyang Chai^1,2, Dexin Sun^1,2,3,4, and Yinnian Liu^1,2,3,4、*

¹ Key Laboratory of Infrared System Detection and Imaging Technologies,Chinese Academy of Sciences, Shanghai 200083, China

² Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

³ University of Chinese Academy of Sciences, Beijing 100049, China

⁴ Qidong Optoelectronic Remote Sensing Center, Shanghai Institute of Technical Physics,Chinese Academy of Sciences, Qidong, Jiangsu 226200, China

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Figures & Tables(11)

Fig. 1. TDI imaging principle of global shutter sCMOS image sensor

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Fig. 2. System temporal noise of TDI image with different stages

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Fig. 3. SNR of TDI imaging system with different illumination

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Fig. 4. Comparison of TDI imaging system for dynamic range

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Fig. 5. Schematic of digital domain TDI field imaging

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Fig. 6. Field images of digital domain TDI with different stages (integration time of 1 ms). (a) M=1; (b) M=10; (c) M=30

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Table 1. System parameters of low-light-level imaging system
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Table 1. System parameters of low-light-level imaging system
Parameter Value
Pixel size /(μm×μm) 6.5×6.5
Array size /(pixel×pixel) 1024×500
Peak quantum efficiency ≥0.55
F# 1.4
System noise /e^- 2
Quantization /bit 16

Table 2. Space-borne imaging system resolution with different digital domain TDI stages
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Table 2. Space-borne imaging system resolution with different digital domain TDI stages
Parameter Stage
1 10 30
Resolution /m 500 159 92
Frame rate /(frame·s^-1) 13.8 43.4 75
Data speed /(Mbit·s^-1) 0.452 14.221 73.728

Table 3. Parameters of low-light-level imaging

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Table 3. Parameters of low-light-level imaging

Parameter	Value
Frame rate /(frame·s^-1)	58.97 (interface limited)
Frame period error /ms	0.01
Integration time /ms	0.98
f /mm	12.7
Rotary velocity /[(°)·s^-1]	1.73 (match frame rate)
Rotary accuracy /%	5
Illuminance /lx	1-3(estimated)

Table 4. Image parameters of different digital domain TDI stages (integration time of 1 ms)
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Table 4. Image parameters of different digital domain TDI stages (integration time of 1 ms)
Parameter Stage number
1 10 30
Signal DN 16.3 162.9 491.1
Noise DN 9.12 29.67 50.39
SNR /dB 5.04 14.79 19.78

Table 5. Measured results of dynamic range with different stages

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Table 5. Measured results of dynamic range with different stages

Parameter	Stage number
	1		10		30
	Traditionalmethod	Proposedmethod	Traditionalmethod	Proposedmethod	Traditionalmethod	Proposedmethod
Maximum DN	65535	65535	65535	65535	65535	65535
Noise DN	7.47	7.47	24.25	2.42	46.51	1.55
R_DR /dB	78.86	78.86	68.64	88.65	62.98	92.52
ΔR_DR /dB	0		20.01		29.54
Theoretical ΔR_DR /dB	0		20		29.542

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Yuantao Zhang, Mengyang Chai, Dexin Sun, Yinnian Liu. Digital TDI Technology Based on Global Shutter sCMOS Image Sensor for Low-Light-Level Imaging[J]. Acta Optica Sinica, 2018, 38(9): 0911001

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