Reading, Recognition And 3D Reconstruction Of DXF Architectural Drawings

With the development of computer technology,computer aided design tools such as AutoCAD have been used by many architects.However,most 3D building structure information is still represented by 2D drawings,making it difficult to automatically rebuild 3D building models from 2D building drawings.Therefore,the use of computer graphics and image analysis and processing technology to read and identify building drawings has become a hot spot.In recent years,the need to automatically build 3D building models using AutoCAD architectural drawings is growing rapidly.The recognition,understanding and three-dimensional reconstruction of two-dimensional architectural drawings is a cross-research area including computer graphics,computer aided design and so on.Related research topic has become the focus.In order to solve this problem,this paper has carried on some related research to the building reading,the recognition and the three-dimensional reconstruction.First of all,DXF file structure is analyzed,a cross-platform open source library DXFLib is used to read DXF information,and some preprocessing operations are performed.Then,by analyzing the contents,features and drawing styles of the plan,a knowledge-based understanding strategy and a geometric constraint recognition method are proposed based on the professional "3D building modeling" principle.In addition,this paper presents an algorithm to identify the wall.Wall is the most important part of building structure,wall identification is floor plan recognition process the most important step.After the identification of the wall,other building components such as doors and windows are more easily identified under the constraints of the wall.Finally,using the 3D building information obtained above,OpenGL is used to discuss the implementation of the 3D building model.Through the above work,we realized reading,recognizing and reconstructing 3D model from DXF file.