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Global relative radiation correction method for the HY-1C/D Coastal Zone Imager

  • role： First author第一作者
  • Affiliation：

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

  • Email：dairongfan@whu.edu.cn
  • Introduction：戴荣凡，研究方向为光学卫星数据处理。Email：dairongfan@whu.edu.cn
DAI Rongfan1,  
  • 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。Email：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 Mi3,  
  • Affiliation：

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

CHEN Ru3,  
  • Affiliation：

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

PENG Tao3,  
  • Affiliation：

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

ZHANG Haonan1

реферат

The HY-1 C/D satellite Coastal Zone Imager (CZI) can image a width of 950 km through the combination of multiple detector groups, which greatly improves the satellite remote sensing data acquisition capability. It is of great significance in global earth observation and ocean water color elements. However, the super-wide imaging system presents severe challenges to the full field of view relative radiometric correction processing. One of the challenges is that the ground calibration field cannot cover all the probes in the imaging field of view due to the ground coverage of the push-scan imaging being nearly 1,000 km. Another challenge is that the full field of linear array detectors and the imaging view differences can cause obvious color differences, and camera mosaic imaging can easily have more serious radiation error accumulation.The CZI is equipped with two cameras and four CCDs for combined imaging. The two CCDs inside the camera adopt collinear full reflection-full transmission optical splicing. The mirror blocks the overlapping area between the reflection and transmission regions, so energy is attenuated at the edge of the image, forming a vignette. Different focal-plane structure installation and imaging field of view, as well as different CCDs, especially the camera response difference, result in dynamic light and shade changes between images and an obvious color difference.To address this issue, an adaptive global color consistency processing method is proposed according to the characteristics of the load structure of the CZI. On the basis of single CCD image radiation correction, the color consistency processing can be carried out adaptively using the global optimization strategy. The global optimization strategy means that a single CCD image is used as a unit of all image color correction model processing, to obtain the global meaning of the optimal solution and eliminate the overall color difference between images. The proposed method first uses the on-orbit statistical method to correct the radiation of single CCD image, which improves the vignetting problem. Subsequently, high-precision geometric stitching of multiple CCD images is carried out using the large-field virtual reimaging method. On this basis, the mean and variance of the overlapping area are calculated to describe the color information of each image. Finally, according to the color consistency constraint of adjacent overlapping area before and after color correction, color parameter calculation and image balance correction of global multi CCD images are realized. In the calculation of color parameters, while eliminating the color differences between images, the color differences of the images before and after correction are ensured to be as small as possible. Doing so increases the number of necessary observation equations and solves the rank deficit problem caused by the number of overlapping pieces always being less than the number of CCD pieces.The experimental results show that root-mean-square deviation of the mean line, generalized noise method, and streaking metrics of the proposed method are better than those of the path transfer method after full field relative radiometric correction. In addition, the relative radiation quality of HY-1C/D satellite CZI is better by 3%.

ключеви́че слова́

HY-1C/D satellite;Coastal Zone Imager(CZI);on-orbit statistical method;color consistency;adaptive equalization between ccd images;relative radiation quality

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