A deep learning-based indoor acceptance system for assessment on flatness and verticality quality of concrete surfaces

• Published in: Journal of Building Engineering 2022-07, Vol.51, p.104284, Article 104284
• Main Authors: Li, Dongsheng, Liu, Jiepeng, Hu, Shenlin, Cheng, Guozhong, Li, Yang, Cao, Yuxing, Dong, Biqin, Chen, Y. Frank
• Format: Article
• Language: English
• Subjects: Concrete surface; Deep learning; Flatness and verticality quality assessment; Residence dataset; Terrestrial laser scanning
• ISSN: 2352-7102; 2352-7102
• DOI: 10.1016/j.jobe.2022.104284

Flatness and verticality quality assessment (FVQA) must be strictly controlled during the indoor acceptance testing. Existing FVQA methods using terrestrial laser scanning (TLS) rely on the as-designed model to assist in locating inspected objects, while sophisticated deep learning techniques excel in the object recognition. Therefore, based on the TLS and deep learning technique, this study presents a general indoor acceptance system including the indoor semantic segmentation, component surface segmentation, and FVQA. In particular, a dataset consisting of 145 sets of room point cloud data (PCD) is created to train the adopted point-based neural network. An image processing-based method is proposed to check the flatness and verticality of identified concrete surfaces. Experiments are conducted on two completed residences to verify the practicality and convenience of the proposed indoor acceptance system by comparing the calculated flatness and verticality with the field measurements. The experimental results show that the deep learning technique used in this study has a good recognition accuracy (over 85%) for large concrete surfaces in residential PCD, and the proposed indoor acceptance system provides more rigorous inspection results compared with the manual inspection method. •A general indoor acceptance system for assessment on flatness and verticality quality of concrete surfaces has been proposed.•A dataset including 145 sets of room point cloud data is created.•A sliding window algorithm simulating a long straightedge of 2 m is developed.•The point-based network, PointCNN, has a good recognition accuracy (over 85%) for ceilings, floors and walls.•The proposed indoor acceptance system is more rigorous than a manual inspection method.