Development And Application Of Model Repair System Based On Oblique Photography Three-Dimensional Model

Tilt photogrammetry 3D reconstruction has become the main means of urban modeling.It has the advantages of high efficiency,high precision,high sense of reality and low production cost,but it also faces the challenges of massive data,one skin and poor quality of details.Factors such as occlusion,weak texture,different illumination and shadow in aerial images may lead to adhesion,holes,chromatic aberration and distortion in the tilt photography 3D model,which will affect the realism of the model scene.Based on the analysis of the research status at home and abroad,this paper studies the common problems in the above-mentioned tilt photography 3D model,and the main contents are as follows:1)According to the characteristics of the tilt photography 3D model,complete the system file management,database and framework design,and achieve the purpose of fast retrieval and fast processing of massive model files.According to the characteristics of the combination of model space division and LOD,a model database is designed to store the spatial information of model files and provide the function of quickly retrieving files for system function processing According to the requirements,the data classes and structures of each module are constructed to realize the organization and management of system data.Combined with the characteristics of computer technology,the operation flow of the system is designed reasonably,especially the operation steps of human-computer interaction such as selection,drawing,task management and processing are simplified,and multi-threading and batch processing are used to improve the system interaction and model processing efficiency.2)This paper solves the key problems involved in model trimming.According to the cutting triangle patch,the cutting algorithm of arbitrary plane surface model triangulation is designed and realized,which improves the cutting accuracy and edge flatness and realizes the physical separation of continuous triangulation,which is the basis of many dressing functions Affine transformation algorithm is used to realize local modification of texture image,which solves the problem of deformation of triangle projection in image and provides support for repairing related problems such as model texture color difference Based on model cutting,the data fusion from external model to scene model is realized,which reduces the data increase of single file,maintains the spatial division of the original model and avoids data redundancy.3)Design and implementation of model trimming function.Aiming at the problems of holes,deformities,distortions and so on in the tilt photography 3D model,Based on the research of key technologies and the linkage of external software(such as PhotoShop),the system designs and implements six main functions:ridge line repair,model leveling,hole filling,suspended solids removal,texture repair and model cutting,which can achieve a single or multiple function combination to complete the trimming of common problems in the model.The system described in this paper is developed based on the underlying languages C++,SQL,OpenCV,OSG,SQLite3 and other open source libraries.The practical application shows that the model trimming system in this paper can solve the common problems existing in the tilt photography 3D model,improve the model quality at the level of detail,and meet the application requirements of the tilt photography 3D model.