融合边折叠与平面约束的建筑物模型简化方法

Simplification method of building model combining edge folding and plane constraints

针对倾斜摄影测量重建的三维建筑物模型存在三角形面元数据量大的问题,该文探索了一种基于平面结构保持的建筑物模型简化方法。使用双边滤波处理模型的三维网格,从而抑制平滑区域的网格起伏和保留过渡区域的边缘特征。在此基础上,利用区域增长法提取有效的平面结构分布。将边折叠算法和平面结构约束融合,设计边折叠运算的代价函数,以迭代的方式删除多余边,直至满足模型精简的条件。通过实测数据处理并与现有先进算法进行比较分析,结果表明,该文方法可以压缩99.5%的数据量并保持良好的建筑物结构形态,在建筑物简化建模方面具备有效性。

Aiming at the problem of large amount of triangular surface metadata in 3D building model reconstructed from oblique photogrammetry,this paper explored a method of building model simplification based on plane structure preservation.Two-sided filtering was used to process the 3D mesh of the model,so as to suppress the mesh undulation in the smooth region and retain the edge features of the transition region.On this basis,the regional growth method was used to extract the effective plane structure distribution.Combined the edge collapse algorithm with the plane structure constraint,designed the cost function of the edge collapse operation,and deleted the redundant edges iteratively until the conditions for model simplification were met.Through the processing of the measured data and the comparison with the existing advanced algorithms,the results showed that the method in this paper can compress 99.5%of the data and maintain a good structural shape of the building,which is effective in the simplified modeling of the building.