AnonTechie [soylentnews.org] writes:
"Virtual periscope" could let submarines see up through the water's surface:
It's a classic scene from many a war movie — a submarine's presence is given away by its periscope protruding through the surface of the water. If submariners want to see what's up there, however, they really have no choice
... although that may be about to change. Scientists at the Technion-Israel Institute of Technology have devised a system that allows an underwater camera to look up through the surface from below, with a minimum of distortion. The system is called Stella Maris, which is short for Stellar Marine Refractive Imaging Sensor. It works by digitally altering the images from the camera, in order to compensate for the visual distortions caused by waves moving through the water's surface. Given that waves move in a random pattern, however, how can it know what sort of alterations are required?
http://www.technion.ac.il/en/2014/05/10770/ [technion.ac.il]
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