NHK Twinscam

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The NHK Twinscam is a digital-optical-mechanical video camera system designed by the Japanese broadcaster NHK for covering aquatic sports events. It uses digital image processing technology to combine video from two synchronized motion-controlled cameras, one above water and one underwater, in real time, to create the illusion of a view from a single camera that can look through air and water at once as if they had the same refractive index.[1]

It was used at the 2012 London Olympics to televise the synchronized swimming events. It has been used for the same purpose in Japan since 2010.[2]


  1. ^ Ben Johnson (2012-08-11). "The Camera They're Using to Show Synchronized Swimming Is an Amazing Tech Innovation". Slate. Retrieved 2012-08-11. 
  2. ^ Gavin J. Blair (2012-08-01). "London 2012: Public Broadcaster NHK Leading Olympics Coverage in Japan". Hollywood Reporter. Retrieved 2012-08-11. 

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