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

LI Jun-lin; GUO Yong-fei; LI Jing-qiu; LAN Tai-ji

doi:10.3788/OPE.20152311.3219

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

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- Influence of electronic nonlinearities of space camera on MTF and their discriminance
- Optics and Precision Engineering Vol. 23, Issue 11, Pages: 3219-3226(2015)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
  2. 中国科学院大学北京,中国,100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152311.3219
  CLC： V447.3;TN386.5
- Received：09 December 2014，
  
  Revised：12 February 2015，
  
  Published：25 November 2015
- 稿件说明：
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李俊霖, 郭永飞, 李静秋等. 遥感相机电子学非线性对调制传递函数的影响及其判别[J]. 光学精密工程, 2015,23(11): 3219-3226

LI Jun-lin, GUO Yong-fei, LI Jing-qiu etc. Influence of electronic nonlinearities of space camera on MTF and their discriminance[J]. Editorial Office of Optics and Precision Engineering, 2015,23(11): 3219-3226
李俊霖, 郭永飞, 李静秋等. 遥感相机电子学非线性对调制传递函数的影响及其判别[J]. 光学精密工程, 2015,23(11): 3219-3226 DOI： 10.3788/OPE.20152311.3219.

LI Jun-lin, GUO Yong-fei, LI Jing-qiu etc. Influence of electronic nonlinearities of space camera on MTF and their discriminance[J]. Editorial Office of Optics and Precision Engineering, 2015,23(11): 3219-3226 DOI： 10.3788/OPE.20152311.3219.

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。

Abstract

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

Keywords

references

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Related Institution

College of Opto-electronic Engineering,Changchun Uniersity of Science and Technology

School of Instrument and Opto-electronics Engineering, Beihang University2. China Centre for Resource Satellite Data & Application

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

Department of Control Science and Engineering, Harbin Institute of Technology

中国科学院长春光学精密机械与物理研究所

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