Study On Refined Three Dimensional Modeling Method Of Ancient Buildings Based On Oblique Photogrammetry

With the occurrence of urban construction,tourism development,fire,natural weathering,man-made destruction and other situations,the existing ancient buildings have been damaged,so it is very necessary and urgent to carry out digital protection of ancient buildings.The effect of traditional protection methods is not ideal,and the development of real-world 3D modeling technology provides new ideas and methods for the protection of ancient buildings.This article focuses on the research on the refined 3D modeling technology of ancient buildings based on oblique photogrammetry,and studies the key technologies and methods such as the collection of aerial and ground oblique images and the construction of refined models;The use of aerial and ground oblique image fusion to construct a refined three-dimensional model of ancient buildings provides a feasible technical reference for the refined threedimensional reconstruction of ancient buildings,three-dimensional display,and cultural relics protection and repair.The main work of the paper is as follows:(1)Research on data collection and 3D modeling based on UAV oblique photography has been carried out.The problem of feature-based matching between multi-angle and multiresolution images is studied,and an UAV oblique image acquisition scheme for ancient buildings is designed.The method of combining fixed altitude and variable altitude is used to collect multi-angle and multi-resolution image data of ancient buildings,and a refined threedimensional model of ancient buildings was constructed.(2)Research on data collection and 3D modeling of ground oblique photogrammetry has been carried out.The feasibility of constructing a refined three-dimensional model based on the images collected by the ground camera is analyzed,and the oblique image acquisition scheme of the ground camera is designed to collect the image of the area obstructed of the ancient building.Construct a three-dimensional model of ancient buildings without image control point constraints based on ground camera images.(3)The research of refined 3D modeling method based on aerial and ground oblique image fusion has been carried out.The aerial and ground oblique image acquisition scheme for refined three-dimensional modeling has been designed,the modeling method based on aerial and ground oblique image fusion has been improved,and the aerial and ground oblique images has been used to conduct modeling experiments based on feature and coordinate fusion to analyze the accuracy and effect of model construction.A refined three-dimensional model of the ancient architectural area of Qingyun Palace was constructed and good results were achieved.