Research On Key Technology Of Automatic Creation Of 3D Model Based On Architectural Drawing

With the comprehensive advancement of information technology in the construction industry,3D models have become an important carrier for information transmission between majors in the entire life cycle of construction projects.However,2D drawings are still relied on by professionals.At present,although a certain correlation mechanism has been established between 2D drawings and 3D models,most of them still stay at the level of manual mold turnover.In order to explore and protect the information contained in 2D drawings,as well as improve the efficiency of automated modeling,the automatic identification and 3D reconstruction of drawings are required in the process of building a 3D model.The three-dimensional reconstruction of architectural drawings is a reverse engineering involving multi-disciplinary collaboration.Most of the existing research results are based on the three-dimensional reconstruction of DFX and DWG files.However,the actual identification and reconstruction are often paper drawings.Therefore,this paper focuses on the key technologies in the process of architectural drawing recognition and 3D model reconstruction,and proposes an automatic reconstruction process of 3D models based on architectural drawings.First,preprocess grayscale and noise reduction of the raster image of the scanned twodimensional drawings of the building.According to the relevant technology of automatic image recognition,the idea of grid block processing of architectural drawings is proposed.The design includes image graying and binary The automatic processing algorithm of architectural drawings based on noise,noise removal and image segmentation;secondly,based on the Hough transform detection theory,combined with the geometric features of the drawings to express the features,a prototype system based on paper drawings for feature recognition and information extraction was designed.Using digital morphology image processing,through design corrosion and expansion operators,extract the necessary parameter information for reconstruction in architectural drawings,complete the extraction of geometric information and non-geometric information of 2D drawing components;finally,integrate the extracted drawing information,According to the naming convention of architectural drawing,construct the correlation mode between the information in the drawing,establish the database for 3D reconstruction,analyze the information description mode based on EXPRESS language,IFC standard and STEP neutral file,and study the different expression methods of architectural geometric information data According to the IFC official analysis document,design the representation process of the IFC three-dimensional geometric model,develop the IFC model generation prototype system,and test the completeness of drawing information extraction and storage through examples,so as to check the accuracy of the three-dimensional model reconstruction.The research results provide theoretical support for improving the efficiency of 3D reconstruction,saving labor costs and simulating the construction process,which lay the foundation for the realization of 3D positive design and information development in the field of construction engineering.