交错排列线列探测器对地成像几何特性及错位校正  

Earth Imaging Geometric Characteristics and Stagger Correction of Staggered Linear Array

作　　者：王运[1,2] 孙胜利[1,2] 林长青[1,2] 

机构地区：[1]中国科学院上海技术物理研究所,上海200083 [2]中国科学院红外探测与成像技术重点试验室,上海200083

出　　处：《光学学报》2014年第13期116-123,共8页Acta Optica Sinica

基　　金：基金项目：武器装备预研基金（9140A21041210ZK0702）

摘　　要：空间相机采用交错排列线列探测器对地成像，其奇、偶列图像数据在沿轨方向出现明显的错位变形，为保证图像的几何精度，提出了一种错位校正方法。通过坐标变换法建立了空间相机对地几何成像模型，分析了错位产生的原因。并对交错排列线列探测器对地成像特性，以及沿轨方向、和线列方向的错位位移情况进行了分析。利用蒙特卡洛法分析了轨道、姿态扰动以及目标高程等因素对错位变形的影响，根据其错位变形情况，提出了一种基于光流场的错位校正方法，利用奇、偶列图像的图像块匹配结果生成图像的光流场，通过光流场来实现图像的错位校正。将该方法用于某红外相机遥感图像的错位校正处理，能显著去除掉遥感图像的错位变形，验证了错位变形分析方法以及错位校正方法的有效性。Space camera uses the staggered linear array for earth imaging, notable stagger distortion is presented between the odd and even parts of the image data in along track direction, in order to ensure the geometric accuracy of the remote images, a stagger correction method is proposed. The earth imaging geometrical model of the space camera is established by utilizing coordinate transformation, and the reason that leads to stagger distortion is discussed. The earth imaging characteristics of the staggered linear array is analyzed. The stagger value in along track direction and along the direction of the linear array is calculated, and the influences on stagger value introduced by orbital displacement, attitude fluctuations, and terrain topography are analyzed based on Monto-Carlo method. A stagger correction method based on optical flow field is proposed according to the characteristics of the stagger distortion, the optical flow field is generated by the block matching of the odd and even parts of the image, and the image is corrected by the calculated optical flow field. The method is used for stagger correction of an infrared camera, remarkable result is reached, which verifies the validity of the stagger distortion analysis method and the stagger correction method.

关 键 词：遥感 图像处理 错位校正 线列探测器 光流场 

分 类 号：TP751.1[自动化与计算机技术—检测技术与自动化装置] V447.1[自动化与计算机技术—控制科学与工程]