Digital holography in the IR range allows, thanks to the longer wavelenght compared to visible ones, allows to image moving human size objects. Moreover, this technique permits to see behind flames, since it does not require lenses in front of the thermal camera, and therefore the sensor does not get blinded by radiation emitted by fire.@
see also (e.g.) http://www.bbc.co.uk/news/technology-21602952 and http://www.dailymail.co.uk/sciencetech/article-2285459/Holographic-camera-firefighters-flames.html
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