I wonder if their system would work better if instead of using ordinary surveillance cameras, they used one of the new "dual sensor" cameras that combines visible imaging and thermal imaging into the same unit. Then they could not only track objects using color information, but would have a temperature signature too. I think this could improve their system's tracking ability for tracking objects that emit heat (like people). Plus it would work at night. I don't know how well thermal imaging works outdoors or in a brightly lit office environment though. Anybody know anything about this?