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一种改进的空间相机在轨调制传递函数检测方法

Improved Method for On-Orbit Modulation Transfer Function Detection of Space Cameras

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摘要

根据空间探测相机在轨工作状态及成像特点,结合调制传递函数(MTF)常用测试方法,利用月球边缘刃边法,对其进行了在轨MTF检测。该方法将月球边缘与深空背景形成的高对比度线状边缘图像作为测试目标,使用仿真手段分析每个环节多种处理方法的计算精度及运行速度,形成了优化的月球边缘刃边法在轨MTF检测流程,其中在边缘扩展函数(ESF)处理环节,使用修正的Savitsky-Golay滤波器组合双高斯拟合法,得到了准确的ESF,同时有效抑制了噪声。仿真和实验结果表明,该方法对信噪比高于30 dB图像的测试精度达到0.02,能实现相机焦面位置和MTF的准确标定。

Abstract

According to the on-orbit working state and imaging characteristics of cameras for space exploration, the lunar-edge method is used to detect its on-orbit modulation transfer function (MTF), combined with the commonly used test method of MTF. This method uses the high-contrast linear edge image formed by the lunar edge and the deep space background as the test target. The simulation is used to analyze the calculation precision and running speed of various processing methods in each link, forming an optimized process of on-orbit MIT detection based on the lunar-edge method. In the link of edge spread function (ESF) processing, a modified Savitsky-Golay filter combined with double Gaussian fitting method is used to obtain an accurate ESF while effectively suppressing the noise. The simulation and experimental results show that the proposed method has an accuracy of 0.02 for images with a signal-to-noise ratio higher than 30 dB, which can achieve accurate calibration of camera focal plane position and MTF.

广告组1 - 空间光调制器+DMD
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中图分类号:O436

DOI:10.3788/CJL201946.0704010

所属栏目:测量与计量

基金项目:国家自然科学基金;

收稿日期:2018-11-16

修改稿日期:2019-02-25

网络出版日期:2019-07-01

作者单位    点击查看

程莹:中国科学院西安光学精密机械研究所, 陕西 西安 710119中国科学院大学, 北京 100049
易红伟:中国科学院西安光学精密机械研究所, 陕西 西安 710119中国科学院大学, 北京 100049
刘鑫龙:中国科学院西安光学精密机械研究所, 陕西 西安 710119陕西师范大学物理学与信息技术学院, 陕西 西安 710119

联系人作者:程莹(chengying2015@opt.cn); 易红伟( chengying2015@opt.cn);

备注:国家自然科学基金;

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引用该论文

Ying Cheng,Hongwei Yi,Xinlong Liu. Improved Method for On-Orbit Modulation Transfer Function Detection of Space Cameras[J]. Chinese Journal of Lasers, 2019, 46(7): 0704010

程莹,易红伟,刘鑫龙. 一种改进的空间相机在轨调制传递函数检测方法[J]. 中国激光, 2019, 46(7): 0704010

被引情况

【1】张宗华,王森,王宇莹,张昂,孟召宗,肖艳军,高楠. 基于编码环带径向直线拟合的圆环编码标志点中心提取方法. 激光与光电子学进展, 2020, 57(7): 71203--1

【2】李富强,张孝弘,蔡伟军,常君磊,范俊杰,窦莲英,魏学敏,高扬,高凌雁. 光学拼接焦平面中拼接反射镜参数的计算. 光学学报, 2020, 40(13): 1308001--1

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