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A study on relative radiometric calibration using side-slither data for HY-1D CZI

  • role： First author第一作者
  • Affiliation：

    State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing Wuhan University,Wuhan 430079, China

  • Email：chenru@whu.edu.cn
  • Introduction：陈儒， 研究方向为光学卫星遥感影像相对辐射校正。E-mail： chenru@whu.edu.cn
CHEN Ru1,  
  • role： Corresponding author通信作者
  • Affiliation：

    National Satellite Ocean Application Service, Beijing 100081, China

  • Email：hjy@mail.nsoas.org.cn
  • Introduction：韩静雨， 研究方向为海洋卫星的接收与预处理。E-mail： hjy@mail.nsoas.org.cn
HAN Jingyu2*,  
  • Affiliation：

    State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing Wuhan University,Wuhan 430079, China

WANG Mi1,  
  • Affiliation：

    State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing Wuhan University,Wuhan 430079, China

HE Luxiao1,  
  • Affiliation：

    School of Cyber Science and Engineering, Wuhan University, Wuhan 430079, China

DAI Rongfan3,  
  • Affiliation：

    National Satellite Ocean Application Service, Beijing 100081, China

SUN Congrong2

résumé

The HY-1D satellite is equipped with a Coastal Zone Imager (CZI), which uses both field-of-view-butting and optical-butting. Due to the CZI's super large 63° field of view, the edge of the camera is distorted obviously, which makes the side-slither images distorted observably nonlinearly. The Lines on side-slither images are not slanted lines close to 45°, but irregular curves with a straight middle and bent edges. The traditional processing algorithm for side-slither images based on LSD (Line Segment Detector) is not suitable for the side-slither image of the HY-1D CZI. Aiming at the structural characteristics of the HY-1D CZI, this paper proposed a method for automatic standardization of side-slither images based on the neighbor relationship of detectors, which effectively resolves the problem of the nonlinear distortion of the HY-1D CZI’s 90 degree side-slither image. Firstly, primary correction is performed on the side-slither image according to the traditional side-slither image processing method; Secondly, starting from the first column of the primary corrected image, the mean square error between the current column and the next column with a sliding window with a certain step size in the row direction is calculated, and the step corresponding to the minimum mean square error is taken as the relative value of the next column. Based on the offset of the current column, the overall offset of each column is determined in turn; Finally, according to the offset calculated in the second step, the enhanced corrected side-slither image is obtained by adjusting the primary corrected image, and then the relative radiometric calibration coefficient of the camera is obtained through histogram matching on images. The relative radiometric calibration experiments are carried out on the normal push-broom images, and the comparison experiments are implemented using the on-orbit statistical method. After using the method we proposed, for land scenes, the maximum streaking coefficient of all sensors in the land scene is smaller than 0.33%, the average streaking coefficient is smaller than 0.04%, and the median streaking coefficient is smaller than 0.03%; For ocean scenes, the maximum streaking coefficient of all the sensors is smaller than 0.48%, the average streaking coefficient is smaller than 0.07%, and the median streaking coefficient is smaller than 0.06%. The experiment shows that all indicators are better than the on-orbit statistical method based on massive statistical data of normal push-broom images, our method effectively improves the relative radiometric quality of the HY-1D CZI.

mots-clés

side-slither data;HY-1D (Coastal Zone Imager) CZI;automatic standardization processing;relative radiometric calibration

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