城市实景模型结构化线面特征重构方法

Structured Line and Plane Feature Reconstruction Method of Urban Mesh Model

摘要:

为了改善城市实景模型边缘模糊，提出了一种曲率引导的结构化线面特征重构方法。根据曲率特征将网格分割为平面、可展凹、可展凸以及不可展曲面4类，在平面分割结果内提取平面，在可展凹和可展凸分割结果内提取直线，对过度弯曲的不可展区域进行保留，最终形成包含几何特征的复合网格模型。结果表明，结合曲率信息预先设置几何特征的潜在范围，使得结构化线面特征更可靠，同时保证城市实景中复杂的树结构不被错误地提取为平面。

Abstract:

To improve blurred edges in the real three-dimensional model， a curvature-guided structured line and plane feature reconstruction method was proposed. The meshes were divided into the plane， developable concave， developable convex， and non-developable surface according to curvature characteristics. The plane was extracted from the plane segmentation results， and the straight line was extracted from the developable concave and convex segmentation results. The non-developable area was reserved. Finally， a hybrid mesh model containing geometric features was formed. The results show that the potential range of geometric features is preset in combination with the curvature information， which makes the extracted structured line and plane feature more accurate than other methods. Furthermore， the hybrid model ensures that the complex tree structure in the city scene is not mistakenly extracted as a plane.