基于底点辐射距的真正射影像遮蔽区自动检测算法

Algorithm for Occlusion Automatic Detection of True OthoImages Based on Nadir Radial Distance

本文对真正射影像纠正过程中的关键技术——遮挡区域的自动检测进行了探讨。在详细分析典型的遮蔽检测算法优缺点的基础上,提出了一种基于底点辐射距遮蔽检测的新算法。该算法对扫描方式与M-Portion问题的消除进行了改进;并通过判别准则的约束,使真正射纠正与遮蔽检测可以同时进行,从而减少了大量的冗余计算,提高了算法的执行效率与检测精度。实验证明,该方法特别适合于海量遥感数据的真正射纠正。

The key technology for occlusion automatic detection of true othoImages was discussed here. On the basis of analyzing the advantages and disadvantages of typical occlusion detection algorithm in detail, a new nadir radial distance based occlusion detection method was proposed. Both the scanning way and elimination of the M-Portion in the algorithm was improved, and through the criterion constraint, the true ortho-rectification and occlusion detection can be run at the same time. So, a lot of redundant computation was reduced as well as the efficiency of the imple- mentation of the algorithm detection accuracy was improved. The result of the experiments proved that it was especial- ly suitable for massive remote sensing data of true ortho-rectification.