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为解决城市大比例尺真正射影像制作问题,提出了一种DBM整体投影遮蔽检测方法。该方法利用DBM表面以矢量三角面存储和平面图形投影内部栅格互不遮蔽的特点,首先以三角面为单元对整个建筑物进行正射投影得到房顶多边形;然后进行透视投影得到整个建筑物在像方成像多边形,通过DEM投影迭代算法得到该建筑物在传统正射影像上的成像多边形,两者作差集得到建筑物的遮蔽区域物方多边形;最后选取最优辅影像对遮蔽区域进行纹理补偿,制作出真正射影像。实验结果表明该方法能够快速准确地检测出影像遮蔽区域,为生成高质量真正射影像提供了保障和前提。
In order to solve the problem of making large-scale real radiographic images in cities, a DBM integral projection occlusion detection method is proposed. In this method, the surface of the DBM is stored by triangles and the internal grids are not obscured by the plane graphic projection. The triangles are used as the unit to construct the roof polygons. Then the perspective projection is used to obtain the entire building In the image-like polygons, the building polygons on the traditional orthophoto images are obtained by the DEM projection iterative algorithm. The two are used as the difference set to obtain the object-side polygons of the building obscuration area. Finally, the optimal sub-image is selected for the masking area Texture compensation, to create a real shot image. The experimental results show that this method can detect the shadow area quickly and accurately, which provides the guarantee and precondition for generating high quality real radiography.