资源三号卫星高分影像的城市建筑物阴影提取

针对城市高分影像中普遍存在的建筑物阴影严重影响了高分影像的处理和应用问题,该文通过对资源三号卫星(ZY-3)各波段的影像特征进行分析,分别采用基于直方图的阈值分割法、基于主成分变换和HIS变换集成法对阴影提取并对比分析,在此基础上提出了一种基于谱间关系的阴影提取模型。实验结果表明,该文提出的方法能够较好地区分ZY-3影像中的阴影和偏蓝色地物及水体,能够准确地提取城市高大地物阴影。

Extraction of urban building shadows in the ZY-3 high resolution image

The shadows of buildings exist very commonly in the city's high resolution images,which seriously affect the processing and application of HSR images.In this paper,by analyzing each band's image features of ZY-3,three shadow extracting methods,including histogram based threshold segmentation method,the principal component transform method and the HIS transform integration method were compared and analyzed;on this basis,a shadow extraction model based on the spectral correlation was proposed.Experimental results showed that the proposed method could distinguish the shadows from partial blue objects and water and accurately extract the shadows of the high and big ground objects in the city.