Research On Multi-target Texture Optimization Of Oblique Imagery

With the development of digital city,the construction of three-dimensional urban model has become one of the research hotspots in photogrammetry and computer vision.In recent years,the emergence of UAV oblique photography of new technology provides a good source of data for 3D modeling.Based on the UAV tilt photography technology is different from the traditional vertical photography technology,which combines both vertical photography and oblique photography.It can be access geophysics information from multiple perspectives,and not only reduce the field workload in the data collection,but also increase the wall texture collection in the texture information.In the reconstruction of the three-dimensional model of urban buildings,texture as an important part of reconstruction a realistic 3D model.The quality of the texture directly affects the effect of the model,so the selection of optimal texture is critical in the process of texture mapping and how to choose high quality and high sense of texture has become the focus of research.Therefore,this paper aims at the present research situation of three-dimensional reconstruction of texture mapping at home and abroad.An algorithm for selecting the optimal texture for oblique images is proposed.The algorithm is used to construct the texture optimization model to select the optimal texture.Not only to improve the speed of modeling,but also to strengthen the texture of the realism.So that it has a significant research value.The main contents of texture optimization based on oblique photography and urban 3D texture mapping are as following:First,unmanned multi-rotor aircraft and oblique photography in UAV oblique photography system are studied in depth.The imaging of oblique photography and the advantage of tilting image as texture source is analyzed,and the necessity of selecting the optimal texture is discussed.Second,the method of selecting the optimal texture of the building is described.This paper mainly divides the texture into two parts: the top surface and the wall,and proposes an algorithm to construct the wall texture optimization model to selecting the optimal texture.The algorithm is selected wall texture by constraints and objective functions of model.The constraints and objective functions of the optimization model are described in detail and so as to construct a multi-objective wall texture optimization model.The process of solving the optimization model is described in detail.The third step is to review the texture mapping method,through the analysis and comparison of the texture mapping process was optimized.Match the building model with the image and then use the optimization model to select the optimal texture.After processing and recovering textures of the tree occlusion proble.Use OpenGL mapping the optimal texture image to the 3D building surface,and so as to realize the texture mapping of the three-dimensional model of the building.Finally,the method proposed in this paper is carried out by using oblique images obtained from UAV oblique photogrammetry.By optimizing the texture of the building and normalizing the coordinates of the optimal texture in the image,the optimal texture is mapped to the surface of the three-dimensional model.It proves the effectiveness of this method in improving the texture of the building texture.