Cameras that have functionalities like thermal imaging and night vision have been around for a while, assisting search and rescue missions and surveillance reconnaissance. But these can have a high false-positive rate when searching for humans specifically. So researchers took this issue on and have now developed a camera that detects melanin and water presence together, leading users to a much higher success rate in identifying people.
Another bonus: they can also narrow search results down based on what they know of the person they’re looking for. They can filter out people with lighter skin or people with darker skin.
Read more on this new imaging system here on Armed with Science: http://science.dodlive.mil/2016/02/10/researchers-revolutionize-skin-detection/.