This work demonstrates the application of OpenCV towards feature extraction from 2D engineering drawings. The extracted features are used in the reconstruction of 3D CAD models in SCAD format and generation of 3D point cloud data that is equivalent to LIDAR scan data. Several legacy designs in mechanical and aerospace engineering are available as engineering drawings rather than software generated CAD models. Even in civil engineering, many of the earlier plans are available as drawings rather than BIM/CAD models. The methods proposed in this work can help convert such drawings easily into 3D CAD and BIM models using camera capture or scanned drawing data. The method demonstrates the applicability for simple shapes and does not yet account for the presence of hidden lines in CAD drawings. The developed codes are made available as python Jupyter notebooks through Github.

中文翻译：

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使用OpenCV从2D CAD自动进行3D实体重建

这项工作演示了OpenCV在从2D工程图提取特征中的应用。提取的特征用于SCAD格式的3D CAD模型的重建以及与LIDAR扫描数据等效的3D点云数据的生成。机械和航空航天工程中的一些传统设计可用作工程图，而不是软件生成的CAD模型。即使在土木工程中，许多较早的计划也可作为工程图而不是BIM / CAD模型使用。这项工作中提出的方法可以帮助使用相机捕获或扫描的图形数据轻松地将此类图形转换为3D CAD和BIM模型。该方法证明了对简单形状的适用性，并且还没有考虑到CAD工程图中隐藏线的存在。