嫦娥一号CCD立体相机数据光度校正

摘要

In order to fit coefficients of the phase function more accurately and obtain some accurate results, Lommel-Seeliger factor has been revised according to the characteristics of CCD stereo camera data of Chang'E-1. By effective revision, the incidence angle and instrument viewing angle effect have been removed. The corrected image data fit much better with the variable trend of phase angle. Then photometric correction on the CCD stereo camera data of Chang'E-1 has been carried out pixel by pixel using the improved Lommel-Seeliger photometric correction model introduced by the revised Lommel-Seeliger factor. Finally, this algorithm has been verified by two groups of data from different latitudes of the same orbit and different view angles of the same area, respectively. The experimental results show that this method could effectively correct the inconsistency of the spectral characteristics of the object induced by the change of observation conditions. Moreover, using this method, photometric correction shows better performance even at brighter or darker areas.%为更加精确拟合相函数系数,得到较为准确的光度校正结果,针对嫦娥一号CCD立体相机数据的特点,对改进的Lommel-Seeliger模型中的Lommel-Seeliger因子进行修订,使去除太阳入射角和传感器观测角影响的遥感图像数据能够更好地契合相位角的变化；利用加入修订后Lommel-Seeliger因子的模型对嫦娥一号CCD立体相机数据进行逐像素光度校正；选取同一轨道不同纬度和同一区域不同视角两组数据来验证算法的有效性和适用性.实验结果表明,该方法能够有效校正由于几何观测条件变化而引起的目标光谱特性的不一致性,对于较亮和较暗区域的光度校正效果更为有效.