A map that tracks people's movements across a network of CCTV cameras and gives their location in a real time could be an invaluable tool for finding intruders, or for simply knowing your whereabouts. Dubbed the Marauder's Map after the magical map used by Harry Potter, the system takes security camera footage and analyses it using an algorithm that combines facial recognition, colour matching of clothing, and a person's expected position based on their last known location.
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