基于CMOS图像传感器的微光成像系统信噪比研究  

Study of SNR of Low Light Level Imaging System Based on CMOS Image Sensor

作　　者：张元涛[1,2,3] 孙德新 刘银年[1,2,3,4] ZHANG Yuan-tao;SUN De-xin;LIU Yin-nian(Key Laboratory of Infrared System Detection and Imaging Technologies Sciences,Shanghai 200083,China;Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083;University of Chinese Academy of Sciences,Beijing 100049,China;Qidong Optoelectronic Remote Sensing Center ＆ Shanghai Institute of Technical Chinese Academy of Sciences,Qidong 226200,China)

机构地区：[1]中国科学院红外探测与成像技术重点实验室,上海200083 [2]中国科学院上海技术物理研究所,上海200083 [3]中国科学院大学,北京100049 [4]中国科学院上海技术物理研究所启东光电遥感中心,江苏启东226200

出　　处：《红外》2018年第7期1-7,共7页Infrared

基　　金：国家重点研发计划项目(2017YFC0602103);国家高分辨率对地观测系统重大专项(A0106/1112)

摘　　要：信噪比是微光成像系统的关键参数,决定了成像系统的性能与成像质量。给出了互补金属氧化物半导体(Complementary Metal--Oxide--Semiconductor,CMOS)图像传感器微光成像系统的信噪比模型,仿真计算了系统的信噪比与信号、噪声的关系。搭建了信噪比测试环境,完成了系统信噪比测试实验。实验结果表明,理论值与实测值一致。最后,根据信噪比分析结果对给定系统进行了参数优化。计算结果显示,优化后的系统在1mLux照度下,信噪比能达到4.5。信噪比的研究为基于CMOS微光成像系统的总体设计与优化提供了理论依据。Signal-to-Noise Ratio（SNR）is a key parameter for low light level imaging systems.It determines the performance and image quality of an imaging system.ASNR calculation model of low light level imaging systems based on CMOS imaging sensors is given.The relationship between the SNR and the signal and noise of a system is simulated.ASNR test environment is set up and SNR test experiment is completed.The experimental results show that the theoretical value is consistent with the measured value.Finally,the parameters of a given system are optimized according to the SNR analysis results.The calculation results show that the optimized system improves its SNR up to 4.5 under 1 mlux.This study of SNR provides the theoretical basis for the overall design and optimization of low light level imaging system based on CMOS image sensors.

关 键 词：微光成像 信噪比 CMOS图像传感器 夜天光照度 

分 类 号：TN223[电子电信—物理电子学]