顾及立面元素排列特性的建筑物纹理修复方法

Building Texture Repair Algorithm Considering Facade Elements Arrangement

纹理映射是实景三维重建中重要的技术组成部分,可以显著地增加建模场景的细节和真实感。在自动纹理映射后,由于模型之间的相互遮挡导致的错误纹理贴图需要进行人为修复。而现有的图像修复方法会出现修复区域模糊和与周围区域结构衔接错位等问题。为了解决这些问题,提出了一种顾及立面元素排列特性的立面纹理修复方法,该方法分为自适应层高计算和最佳偏移量搜索两部分,立面层高由自动检测出的引导线对计算得到,而最佳偏移量基于立面层高与修复区域周围特征得到,二者结合可以找到立面图像上错误映射区域最佳的纹理替换位置。最后,利用泊松算法对修复边缘纹理进行融合处理,以提高修复区域与周围区域的色调匹配度。实验表明,该方法可以有效利用立面元素的排列特性修复纹理破损区域,与现有图像修复方法比较,该方法在自动化程度及修复效果上均获得了更好的结果。

Texture mapping is an important technical component in 3D reconstruction of real scenes,which can significantly increase the detail and realism of the modeled scene.After automatic texture mapping,incorrect texture maps due to mutual occlusion between models need to be manually fixed.However,the existing image inpainting algorithms will result in blurred object area and incoherent connection with the surrounding known area structure.To solve these problems,this paper proposes a facade texture repair algorithm according to the regular arrangement of facade elements.The algorithm is divided into two parts:adaptive layer height calculation and optimal offset search.The feature line pair is calculated,and the optimal offset is obtained based on the elevation layer height and the surrounding features of the repaired area.The combination of the two can find the best texture replacement position for the incorrectly mapped area on the elevation image.Finally,the inpainted edge textures are fused by Poisson algorithm to improve the tonal matching between the inpainted area and the surrounding area.Experiments show that the algorithm can effectively use the arrangement characteristics of facade elements to repair damaged texture areas.Compared with the existing image repair methods,this method achieves better results in terms of automation and repair effect.