Nowadays with the BIM system advances, digital construction becomesmore necessary than ever.While many digital data for design and management stages, this thesis focuses on monitoring part by generating 3D-model from captured images, which brings benefits to the construction and maintaining as well as possibly more general usecases. Colmap, a photogrammetric toolchain, provides a complete workflow from source images to sparse and dense models, with plenty of parameters to be customized. By following the pipeline of Colmap,fundamental relating theories in Computer Vision such as SIFT, SfM and MVS are explored and utilized. In this thesis, an evaluation system aiming at tower crane created and used to reflect the quality of reconstruction. Through experiments on provided data of construction sites, this thesis discusses the influence of critical factors on the reconstruction. This study provides an attainment from general reconstruction to targeted optimization and leaves a fundamental system for furtherresearch.     «

Nowadays with the BIM system advances, digital construction becomesmore necessary than ever.While many digital data for design and management stages, this thesis focuses on monitoring part by generating 3D-model from captured images, which brings benefits to the construction and maintaining as well as possibly more general usecases. Colmap, a photogrammetric toolchain, provides a complete workflow from source images to sparse and dense models, with plenty of parameters to be customized. By fol...     »