数字建筑模型整体投影真正射影像制作中的遮蔽检测方法

发布时间：2018-05-24 15:39

本文选题：真正射影像 + DBM整体投影　；参考：《武汉大学学报(信息科学版)》2017年01期

【摘要】：为解决城市大比例尺真正射影像制作问题,提出了一种数字建筑模型(digital building model,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的成像多边形,通过数字高程模型(digital elevation model,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,两者求差集得到建筑物的遮蔽区域物方多边形;最后选取最优辅助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。
[Abstract]:In order to solve the problem of making real projective images on large scale in cities, a digital building model, digital building model-DBM, is proposed for global projection shadowing detection. In this method, the DBM surface is stored on the vector triangular surface and the inner grid is not shielded by the plane graph projection. Firstly, the roof polygon is obtained by normalizing the whole building with the triangular plane as the element. Then the imaging polygon of the whole building in the image square is obtained by perspective projection, and the image polygon of the building on the traditional orthophoto image is obtained by the digital elevation model and digital elevation model. The difference sets are obtained to obtain the object square polygon in the shelter area of the building. Finally, the optimum auxiliary image is selected to compensate the texture of the shelter area, and the real image is made. The experimental results show that this method can quickly and accurately detect the shaded area of the image and provide the guarantee and premise for the generation of high quality real image.
【作者单位】：武汉大学测绘学院;重庆市地理信息中心;湖北省国土资源厅国土整治局;湖北工业大学计算机学院;
【基金】：国家自然科学基金(41271431)~~
【分类号】：TP391.41;P23

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