AR-based 4D CAD System Using Marker and Markerless Recognition Method

Requests for three-dimensional (3D) designs have increased in recent construction projects as the shapes of structures have become more complicated and the difficulties involved in designing buildings have increased. However, most site engineers still prefer two-dimensional (2D) drawings. The main reason for this preference is the difference in reality and operation from the information provided in a 3D presentation. To rectify this mismatch, this study proposed and implemented an augmented reality-based drawing verification system. The proposed system utilizes both marker and markerless recognition methods for efficient operation. Further, a suitable marker generation method is proposed for each recognition method. The results obtained during actual operation of the implemented system verify the efficacy of both the proposed system and the recognition modes. The AR-based drawings verification system suggested in the study can improve the understanding of drawings and it will be more useful for railway construction which is composed of a combination of heterogeneous drawings such as earthwork, track work and electrical work.