Research On Key Technology Of 3D Modeling Based On ContextCapture Tilt Photography

In recent years,with the rapid development of "digital city",urban threedimensional model has been paid more and more attention by scholars in the industry.Although the traditional modeling method can achieve more ideal precision,it can not carry out 3d reconstruction on a large scale efficiently.Inclined photography can take multiple cameras at different angles on the same platform to shoot the target area,so as to quickly obtain rich side texture information of ground objects,which provides a new idea for the efficient production of three-dimensional models of large areas.In this paper,slant photography is taken as the research object,and the method of urban threedimensional reconstruction based on slant photography is studied.The two key technologies involved in the slant image matching and the fine modeling of the fusion of slant photography and ground laser point cloud are analyzed and studied.The main research content of this paper is:1)research on tilted image matching technology.The principle of SIFT algorithm with scale invariability and ASIFT and MSER algorithm with affine invariability are introduced in detail.2)research on ContextCapture 3d modeling method.The images and POS data of a university in daxing district of Beijing were obtained by using the "tianxing 3" four-rotor tilt photography system.The layout method of image control points and checkpoints was elaborated in detail.With the help of ContextCapture software,the test area was reconstructed in 3d,The modeling process is described and the accuracy of the 3D model is analyzed.The results show that the urban 3D model based on tilt photography can meet the accuracy requirements of large scale topographic maps.3)Study on the fine modeling of the fusion of tilt photography and ground laser point cloud.Aiming at the three-dimensional model drawing and deformation caused by the limitation of blind areas such as eaves occlusion in the process of tilted photography,the refined modeling of the fusion of tilted photography and ground laser point cloud was proposed.The feasibility of the registration of tilted image point cloud and ground laser point cloud was studied and verified by experiments,and the model was refined.Figure 43;Table 6;Reference 50...