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摘要: 倾斜摄影测量进行三维模型重建时，由于影像匹配精度和密集点云简化等因素，使得三角形网格模型表面的法向量存在许多明显噪声，加上镜头畸变和光照条件不同引起的影像间几何与辐射的不一致，最终导致不同三角形之间纹理映射结果不连续，这种碎片状纹理表面的真实感不强，难以直观理解。针对此，提出了一种局部区域表面一致性约束的纹理映射方法，采用区域生长策略将多个三角形合并为一个较大的平面区域，并且在区域生长过程中顾及了区域的连续性和平面性，建立该平面区域与同一影像之间的映射关系。实验证明了该方法能够有效消除纹理映射碎片化的现象。Abstract: Due to the limitations of the accuracies in dense image matching and the factors of simplification during the three dimensional mesh generation, enormous noises normally occur on the triangular mesh surfaces during object reconstruction procedures. Furthermore, the geometrical and radiant differences between images, together with the noises, cause the textured mesh fragmentation. Aiming to solve this problem, this paper proposes a texture mapping method using a local surface consistency constraint. In this mapping procedure, fragmented triangles are merged into a relative larger surface with region growing, considering continuity and planarity. The regions are treated as a rigid surface and mapped to the same image to relieve the fragmented effect in the textured mesh. Experimental results show that the proposed method is effective and the output has better consistency than industry standard software such as street factory.
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Keywords:
- oblique photogrammetry /
- triangle-mesh model /
- region-growing /
- texture mapping
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表 1 区域生长前后碎片化程度对比
Table 1 Comparison of Fragmentation Degrees of the One-by-one Approach and Our Approach
方法 总连通区域个数 三角形个数＜10的连通区域个数 三角形个数＜5的连通区域个数 三角形个数=1的连通区域个数 平均包含的三角形个数 逐个三角形映射方法 11 755 10 766 9 640 5 748 5.1 一致性约束的区域生长方法 909 541 457 216 66.0 
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