  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.
