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利用航空影像生成DEM的多层次整体优化方法

DOI: 10.11834/jig.20090734

Keywords: DEM生成,立体匹配,马尔可夫随机场,整体优化

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Abstract:

利用航空影像生成数字高程模型(DEM)通常包括两个步骤,首先采用特征匹配方法建立稀疏对应并确定其高程,然后采用内插方法生成密集高程数据。匹配过程没有进行整体优化,内插过程往往引入误差,它们都将降低DEM生成质量。将DEM生成表述为像素标号问题,匹配影像直接生成DEM,不但进行整体优化而且去除内插对DEM质量的影响。在此基础上,提出了层次标号策略,首先构造多分辨率DEM,然后确定最低分辨率高度场,并自顶向下逐步确定剩余分辨率高度场。多分辨率表达形式和层次标号策略提高了求解效率,能处理数据量非常大的航空影像。利用较高层标号结果限定较低层节点的状态空间,不但提高搜索效率而且提高求解可靠性。实验结果表明上述方法能够生成高质量DEM。

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