| With the rapid development of CAD/CAM technology,computer graphics are becoming more and more popular,2D engineering drawing is still a common technical language in engineering.It plays an important role in the design of product design,the preparation of process flow and technical exchange.Therefore,the study of 2D engineering drawing is still the focus of our research.But for a long time drawing reading and identification are rely on manpower to complete,it is difficult to achieve the development of the new technology.Therefore,the realization of computer automatic reading become more and more important,and its core content is for 2D engineering drawing recognition.In this paper,the two-dimensional engineering drawings are studied and analyzed,and the previous 2D engineering drawings and 3D reconstruction techniques are studied.First of engineering drawings of engineering semantics analysis,respectively,the expression mode semantics,projection relation semantics and the dimension constraint semantics do explicit and implicit analysis and 2D engineering drawing feature model were analyzed.According to the basic method for human reading from the geometric features,in line with the characteristics and processing characteristics were summarized.On the other hand,the scanned image is studied,which is used to extract the feature points of the image,which is related with the 3D model,which needs to be solved.The problem is that the image of the target image is affected by occlusion and illumination changes,and the continuous tracking of the target image,and can help users to understand the 2D engineering drawings and 3D models.This paper is to study the system based on the characteristics of engineering drawings and the research and implementation of image enhancement,deepen the user's understanding of engineering drawings and engineering drawings and three-dimensional model of the relationship between the purpose of supporting engineering graphics teaching. |
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