Create 3D Models from Photos Captured by Sony Alpha 7 Mark 2 Digital Camera

Abstract

AbstractCreating a 3D model of the object is necessary for assessing the current status, exploitation, management, and information storage of the construction. Using photographs to create 3D models is a common practice. The photos of Solar BK construction are captured for generating the 3D point cloud using COLMAP open source application using structure from motion algorithm. However, the created cloud is not the right size and needs to be adjusted to the original size. In this study, the authors propose using the average scale to re-establish the construction's size. The average scale is calculated from the ten measured edges chosen horizontally and vertically around the building. The result obtains a dense point cloud model with nearly 2.7 million points. After correcting the point cloud, the lengths of the checked edges have an absolute error of no more than 3 cm from the actual size and a relative error of less than 1:80. The resulted point cloud is sent into AutoCAD software to reconstruct the 3D model of the construction manually. The results show the ability to create 3D models of objects from photos taken by digital cameras. This result is suitable for applications that do not require too high accuracy, such as building status management or building data visualization.Keywords3D modelsDigital cameraPoint cloudPhotogrammetry