基于单幅图像成像一致性的组合式建筑交互建模

Single Image Based Interactive Modeling for Modular Architectures Using Imaging Consistency

在组合式建筑建模中,针对单幅建筑物图像提供的信息量少、建筑物部件之间的相互遮挡等局限性,提出一种"部件建模-联合优化"的组合式建筑交互建模方法.首先根据输入的单幅建筑物图像,用户标注图像上建筑物单个部件的6个顶点,系统获取顶点坐标并利用其与三维几何体顶点之间的对应关系构建长方体初始部件模型,使得其投影与图像上的部件轮廓相匹配,以实现相机标定;然后对选定的初始部件模型进行交互式编辑以生成相邻的部件,并使得生成的相邻长方体部件投影与图像上的相应部件轮廓相匹配,基于相机内参的成像一致性完成建筑物相邻部件的重建;最后利用组合式建筑建模的投影误差和共面约束误差进行联合优化,生成精确的组合式建筑物模型,并利用建筑物纹理的对称性合成真实的三维组合式建筑.利用.NET平台下的Emgucv库和OpenGL库实现基于单幅图像的建筑物三维建模,实验结果表明,该方法能方便高效地重建单幅图像中的组合式建筑物,且具有较强真实感.

In the area of 3D modular architecture modeling,to overcome the limitations of less information for a single image and the local occlusions of adjacent building parts,this paper presents an interactive 3D modeling method for modular architectures,that is,from component modeling to joint optimization.First,according to the input single building image,user annotates six corner points of a single building component on the image.The system obtains the corner coordinates and constructs the cuboid initial part model by using correspondences between the corner points and the 3D geometric part,which will match the contour of building component on the image to realize the camera calibration.Then,the selected initial part model can be interactively edited to generate the adjacent components through matching the corresponding contour of building part on the image,which can reconstruct the adjacent building components according to the imaging consistency of the intrinsic camera’s parameters.Finally,the joint optimization step considering the projection and geometric constraints of the composite building is used to generate an accurate 3D modular architecture.The final real three-dimensional modular architecture can be synthesized according to the symmetry of building color texture.Using Emgucv library and OpenGL library on.NET platform,the system can build 3D architectures from a single image.Experimental results show that our proposed method can reconstruct the modular architectures in a single image easily and efficiently,and also has a strong sense of reality.