遥感相机电子学非线性对调制传递函数的影响及其判别  

Influence of electronic nonlinearities of space camera on MTF and their discriminance

作　　者：李俊霖[1,2] 郭永飞[1] 李静秋[1] 兰太吉[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《光学精密工程》2015年第11期3219-3226,共8页Optics and Precision Engineering

基　　金：吉林省科技发展计划资助项目(No.20120331)

摘　　要：遥感相机电子学系统在信号转换过程中会产生V/Q非线性和DN/V非线性,并均会对成像子系统的调制传递函数(MTF)造成影响。本文研究了这两种电子学非线性的产生机理和对MTF的影响并提出了相应的判别方法。从两种非线性的产生机理出发,建立了V/Q非线性和DN/V非线性模型,深入分析了两者对相机MTF的影响并进行了仿真实验。实验表明,非线性造成了电子学MTF的下降,使其由正常状态下的0.55下降为0.47,此外还导致MTF随照度变化。提出了基于视频响应曲线结合响应非均匀性(PRNU)噪声曲线区分V/Q非线性和DN/V非线性的方法并进行了仿真验证。仿真实验验证了提出方法的有效性,为系统设计、改进和非线性补偿提供了有力支持。The electronics system in a remote sensing camera will generate V/Q nonlinearity and DN/V nonlinearity in signal conversion processing and both of them effect the Modulation Transform Function（MTF）of the sub-imaging system.This paper focuses on the generation mechanism of two kinds of electronic nonlinearities and the effects of the nonlinearities on the MTF and proposes a discriminant method for the electronic nonlinearities.On the basis of the generation mechanism,the V/Q and DN/V nonlinearity theoretical models are established,their effects on the MTF of the camera are researched and a simulation experiment is performed.Experimentl results show that the MTF falls with electronic nonlinearity from 0.55 under a normal state to 0.47,and it also changes with illumination.Finally,a method based on combination of a video response curve and a Photo-response Non-uniformity（PRNU）noise curve is proposed to distinguish the V/Q nonlinearity and DN/V nonlinearity.The simulation is put forward and the feasibility of the proposed method is verified。The research provides strong supports for the design,improvement and nonlinearity compensation of remote sensing cameras.

关 键 词：遥感相机 电子学非线性 调制传递函数 视频响应曲线 响应非均匀性噪声曲线 

分 类 号：TN386.5[电子电信—物理电子学] V447.3[航空宇航科学与技术—飞行器设计]