Research On Texture Mapping Method Of 3D Model Based On Unmanned Aerial Vehicle Oblique Image

3D reconstruction based on tilted images is a new research hotspot in computer vision and photogrammetry.Three-dimensional modeling of tilted photography has the advantages of low cost,high efficiency and integration of texture model data acquisition.Especially with the development of low-altitude UAV,it has developed into the mainstream three-dimensional urban modeling method.Among them,texture mapping is an important component of the threedimensional modeling of tilted images.Accurate texture can enhance the readability of the model and determine the detailed expression of the model.However,there are many problems in UAV tilt image,such as large image angle,high image overlap and occlusion,which make the texture mapping based on UAV tilt image have some problems to be solved.On the one hand,in texture mapping,the three-dimensional mesh constructed from tilted images has some problems,such as poor mesh construction effect,distortion of mesh structure,and the generated mesh is not suitable for texture projection.On the other hand,the texture projected to the model needs to be optimized.The texture projected from the tilted image to the model also has the problems of texture segmentation and texture reality deficiency.In view of the above two problems,this paper studies the construction of dimensional mesh and the optimization of model texture.On the one hand,aiming at the problems of poor Meshing Effect and distortion of mesh structure,this paper proposes a threedimensional meshing method based on graph cut method to provide a suitable three-dimensional model for texture mapping.On the other hand,in order to improve the readability of the model,a texture Optimization Method Based on confidence propagation and a texture color leveling method based on color value are proposed.Thus,the texture mapping effect of the model is improved,and the readability and detail expression of the model are enhanced.The innovations of this paper are as follows:(1)Aiming at the problem that the threedimensional meshes generated by tilted images in texture mapping are not suitable for texture mapping,a three-dimensional mesh construction method based on graph cut is proposed to improve the quality of the three-dimensional meshes and the effect of the final model.(2)Aiming at the problem of unreasonable texture selection,this paper proposes a distance-based texture occlusion detection method and an optimal selection method based on confidence propagation to make the image consistent with the original shape and texture distribution of the objects.(3)According to the basic characteristics of texture color distribution,the method based on color interpolation is used to globally homogenize texture,so that texture tends to be consistent globally.Then,aiming at the gap between textures,a local homogenization method based on Poisson fusion is used to eliminate the visible texture boundary.