In the last decade, consumer-grade waterproof digital cameras have been available more readily, allowing a more straight-forward application of underwater stereo photogrammetry, with the goal of obtaining high-quality DEMs. This paper presents our work into 3D river-bed reconstruction, using a GoPro Hero 3 black edition camera based on Tsai's calibration. The objective of this paper is to identify the performance of Tsai's calibration for underwater applications and provide other researchers with practical operation guidelines in respect to camera to object distance and various flow strengths encountered. We present the DEM results for a ground truth hemisphere model, chosen for its resemblance with packed natural water-worked gravel particles.
['Wei Li', 'Trevor Gee', 'Patrice Delmas', 'Heide Friedrich']
Evaluating using GoPro cameras and Tsai's calibration for video-based submerged river-bed reconstruction