“海洋一号”D卫星海岸带成像仪双相机几何拼接

Double-camera Geometric Stitching of HY-1D Coastal Zone Imager

实现海岸带成像仪双相机分片影像的高精度拼接,获得几何无缝的标准影像产品,是海岸带成像仪地面预处理的一项核心技术。文章根据“海洋一号”D卫星海岸带成像仪双相机的物理结构及其成像机理,重点介绍了一种基于虚拟化拼接的高精度几何拼接方法,主要包括在轨几何定标和虚拟化拼接两个部分。对海岸带成像仪分片影像数据进行了几何拼接试验,结果表明:文中所提方法获得的拼接影像的内部几何精度可以达到优于1个像素,说明海岸带成像仪具有良好的几何性能。

In the ground preprocessing of the coastal zone imager(CZI)image data,it is a core technology to geometrically stitch the sub-images collected by the two cameras and obtain a geometrically seamless standard image.According to the physical structure and imaging mechanism of the CZI cameras equipped on the HY-1D satellite,we introduce a precise geometric stitching approach based on the virtual stitching in this study.The approach mainly includes two parts:in-orbit geometric calibration and virtual stitching.The experimental results of the CZI sub-image stitching show that the internal geometric accuracy of the stitched images obtained by the introduced approach can reach a sub-pixel level.It demonstrates that the CZI cameras have a good geometric performance.