[HQR05-P03] A case study on 3D measurement of underwater structure by using digital image data taken with a digital camera
Keywords:SfM, 3D model, metashape, underwater geoarchaeology, Kurodagori
Therefore, in this study, we applied SfM technique for 3D reconstruction of underwater objects by using underwater photo during Kurodagori project. Compact digital camera (TG series, Olympus Corporation) was used to take photos. A commercial software Metashape (Agisoft) was used to construct the 3D models. We succeeded to construct the geographical data at a local spot of Nomi-bay by using about 30 photos. On the contrary, we failed to construct the 3D model of octopus trap pot, probably due to low visibility of undersea.
In this study, we compare 3D models of the pillars at Tsumajiro area and the octopus pot at Nomi-bay by using underwater photo to those by using photo at surface. We also improve the method to construct 3D models that original photo data is difficult to take due to high reflectivity of sunlight from the surface of the objects.
This research is supported by a grant from Kochi-bank foundation for the promotion of regional economy.