基于底点辐射距的真正射影像遮蔽区自动检测算法

摘要

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 implementation of the algorithm detection accuracy was improved.The result of the experiments proved that it was especially suitable for massive remote sensing data of true ortho-rectification.%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.