全局快门sCMOS图像传感器数字TDI微光成像技术

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

为实现高分辨率大动态范围的空间微光(LLL)成像,提出基于全局快门科学级互补金属氧化物半导体(sCMOS)图像传感器的数字域时间延迟积分(TDI)微光成像方法。通过推导数字域TDI成像数据处理方法,建立了系统信噪比(SNR)模型,提出了数字域TDI大动态范围成像方法,并分析了速度失配导致的调制传递函数(MTF)退化现象。实验结果表明,该方法能够明显提高微光成像质量,当数字域TDI积分级数为30时,系统SNR由未积分的5.04dB提高到19.78dB,动态范围比传统数字域TDI方法提升了29.54dB,为实现高分辨率大动态范围空间微光成像提供了保障。

In order to meet the demands of space imaging with high resolution and large dynamic range at low light level（LLL）,digital domain time delay and integration（TDI）technology based on scientific complementary metaloxide-semiconductor（sCMOS）image sensor with global shutter is proposed,and image data processing algorithm is deduced.Corresponding signal-to-noise ratio（SNR）model is established,dynamic range extension imaging method based on digital domain TDI is proposed,and modulation transfer function degradation due to velocity errors is analyzed.Experimental results show that the proposed method can significantly improve LLL image quality.System′s SNR increases from 5.04 dB to 19.78 dB with 30 TDI stages,and dynamic range increases by 29.54 dB compared to traditional digital domain TDI method,which highlights the potential of the proposed method for space LLL imaging with high resolution and large dynamic range.