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Using a Kinect V2 and Scatter's DepthKit software, I experimented with underwater RGBD (RGB + Depth) video. Could I capture a 3D image of a bubble, or exhaling underwater?
The challenges of underwater sensing and capture are myriad; after overcoming some issues with water's high absorption of infrared light, the difficulty of housing a tethered sensor underwater, and syncing the color image with the depth image, I successfully captured a few small (but captivating) underwater events.
More info on Professor Golan Levin's class blog.