嫦娥一号月面成像的高精度匹配及月貌三维重建

High Precision Matching and 3DSurface Reconstruction of Chang′E 1 Lunar Images

针对嫦娥一号探月卫星2C级月面成像,提出了基于待配点最优模板选择的二次函数形变补偿迭代匹配方法。仿真表明它能有效地适应地形起伏引起的图像形变,匹配精度较高且稳定性好。在标准相关匹配的基础上结合所提出的方法完成了下视图与前、后视图的精确匹配,采用三视约束机制和顺序检验机制保证了匹配的稳健性。分析了线阵相机成像的仿射近似模型,并以此为基础实现同轨三视重建。基于邻轨下视图同名特征点,采用RANSAC方法估计邻轨三维坐标转换参数,完成邻轨拼接。实验结果表明,三维重建的月貌图能够更好地表达月球表面的形状和地形。

An iterative matching method based on choosing optimal mask and representing deformation by the quadric function is proposed to solve the matching problem of 2C level lunar images by Chang^E 1 （CE1） lunar probe satellite. The simulation results show that it has high precision and stability which self adapts well to the relief terrain＇s imaging deformation. A precise matching is applied to the normal view, forward view and backward view of the CE1 image by combining the proposed method and the standard correlation method. Mfine model approximating the imaging of line scanner camera is analyzed and applied to the same orbit＇s three-view reconstruction. The adjacent orbit＇s lunar terrain registration is realized by RANSAC estimation of three-dimensional （3D） coordinate transformation parameters led by matching feature points of adjacent normal views. The experiment results indicate that the shape and terrain of lunar surface can be better understood from the reconstructed results.