基于阵列点源的光学遥感卫星像质评价方法  

Image Quality Evaluation Method for Optical Remote Sensing Satellite Based on an Array of Point Sources

作　　者：郑昱君 徐伟伟[1] 李鑫[1] 司孝龙[1] 杨宝云[1] 张黎明[1] ZHENG Yujun;XU Weiwei;LI Xin;SI Xiaolong;YANG Baoyun;ZHANG Liming(Key Laboratory of Optical Calibration and Characterization,Hefei Institutes of Physical Science,Chinese Academy of Science,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究院,通用光学定标与表征技术重点实验室,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《光子学报》2023年第4期170-178,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(No.41601388)。

摘　　要：提出一种基于阵列点源的光学遥感卫星像质评价方法,以轻小型、自动化的反射点源阵列作为检测参照目标,最小二乘法二维高斯模型拟合阵列点源影像获得像点坐标,结合地面点源位置测量获得遥感器地面像元分辨率;以点源影像像点坐标为基准,对阵列点源遥感影像数据进行位置配准与高斯模型拟合获得成像系统点扩散函数与调制传递函数值。试验结果表明:像点坐标的共线误差小于0.002像素,地面像元分辨率的相对偏差优于6.5‰,阵列点源可以综合实现光学遥感卫星的像质评价与辐射定标。Ground pixel resolution and modulation transfer function are two important parameters for image quality evaluation of high spatial resolution optical remote sensing satellites,which are of great significance in target recognition,image interpretation,and information extraction.We present an image quality evaluation method for remote sensor using an array of point sources,which takes the light,small,and automated reflected point source array as reference.Two image quality evaluation parameters of remote sensor ground pixel resolution and modulation transfer function can be obtained at the same time.The twodimensional Gaussian model is used to describe the point spread characteristic of the optical remote sensing satellite imaging system.Selecting the 5×5 pixel values of each reflective point source remote sensing image into the point spread function model and use the least squares method to fit the two-dimensional Gaussian surface to obtain the image point coordinates.According to the ground pixel resolution detection principle and combined with the ground point source position measurement,the ground pixel resolution of the remote sensor is obtained.Based on the image point coordinates,all point source image data are positionally registered,and the image data after data rearrangement is fitted again with the twodimensional Gaussian surface to obtain oversampled,sub-pixel interpolated optical remote sensing satellite imaging system point spread function,and then obtain the system modulation transfer function.In the image quality evaluation test of ZY-3 satellite based on reflective point sources,a 4×4 reflective point source array with non-integer pixel intervals was concentrated on the calibration test site along the flight direction and the linear array direction.The distance between adjacent point sources is 10.25 pixels,and the distance between two point sources is 20.5 pixels.The point spread function of the optical remote sensing imaging system can be sub-pixel interpolated to 0.25 pixels,which can effectiv

关 键 词：遥感 像质评价 调制传递函数 地面像元分辨率 阵列点源 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置] O435[自动化与计算机技术—控制科学与工程]