HY-1C/D海岸带成像仪全视场整体相对辐射校正方法研究  

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

作　　者：戴荣凡 韩静雨 王密[3] 陈儒 彭涛 张昊楠 DAI Rongfan;HAN Jingyu;WANG Mi;CHEN Ru;PENG Tao;ZHANG Haonan(School of Cyber Science and Engineering,Wuhan University,Wuhan 430079,China;National Satellite Ocean Application Service,Beijing 100081,China;State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学国家网络安全学院,武汉430079 [2]国家卫星海洋应用中心,北京100081 [3]武汉大学测绘遥感信息工程国家重点实验室,武汉430079

出　　处：《遥感学报》2023年第5期1121-1132,共12页NATIONAL REMOTE SENSING BULLETIN

基　　金：湖北省自然科学基金重点类项目(编号:2020CFA001);湖北省重点研发计划(编号:2020BIB006)~。

摘　　要：海洋一号C/D卫星(HY-1C/D)海岸带成像仪CZI (Coastal Zone Imager)搭载有2个相机4片CCD,幅宽为950 km,在0级原始影中存在渐晕和片间色差等辐射问题。本文针对海岸带成像仪载荷结构特点,提出了一种针对多片原始CCD影像片间自适应均衡的相对辐射校正方法。首先,采用在轨统计方法对单片CCD影像进行片内辐射校正,明显改善了渐晕问题。然后,通过大视场虚拟重成像方法对多片CCD影像进行高精度几何拼接,在此基础上,统计重叠区域色彩信息。最后,根据相邻片左右重叠区在片间色彩校正前后具有色彩一致性的约束,实现全局多片CCD影像色彩参数解算和片间影像均衡校正。从实验结果来看,经过全视场相对辐射校正处理后,平均行标准差、广义噪声和条纹噪声均优于路径传递法,相对辐射质量优于3%,有效提高了海洋一号C/D卫星海岸带成像仪影像相对辐射质量。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

关 键 词：HY-1C/D 海岸带成像仪 在轨统计法 色彩一致性 片间自适应均衡 相对辐射质量 

分 类 号：P2[天文地球—测绘科学与技术]