Fig. 1. Lateral view of the bridge pier
Fig. 2. Some images obtained by the Phantom 4 Pro V2; (a) Photos (b) Video frames
Fig. 3. (a) Masked sample images (b) masked enhanced sample images
Fig. 4. Distance difference of a pier’s photo point clouds and point clouds generated from (a) original frames (b) masked frames (c) masked enhanced frames. The green points have relatively high distance differences
Fig. 5. DSM of the pier using (a) photos (b) original frames (c) masked frames (d) masked enhanced frames
Table 1. Phantom 4 pro V2 specification
Table 2. Features matching with photos
Table 3. Errors of exterior orientation
Table 4. Accuracy assessment of a point cloud from video frames with reference to photos’ point clouds (unit: meter)
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