Automatic generation of building information models from digitized plans

This paper proposes a new approach to creating Building Information (BIM) models of existing buildings from
digitized images. This automatic approach is based on three main steps. The first involves extracting the useful
information automatically from rasterized plans by using image processing techniques that include segmentation,
filtering, dilation, erosion, and contour detection. This information feeds the knowledge base of an expert
system for BIM model generation. In the second step, using the knowledge base of the expert system, the information
required to inform the BIM model can be deduced. The range of information thus obtainable can be
extended beyond the examples given. The paper concludes with a discussion of the final stage: the automatic
generation of an Industry Foundation Classes (IFC) information model with all the desired geometric, physical
and technical information. This can be accomplished by using one of the available open-source application
program interfaces (APIs). This stage is currently work-in-progress and will be the subject of a future publication.