Anti-Drone Applications
People can hear drones before they can see them. But once they are heard, zoom cameras could find them.
Protecting infrastructure against drones could use an inexpensive grid of upward facing fisheye camera. The grid could both detect low flying drones, and triangulate their exact 3-D positions. More expensive high resolution cameras with physical zoom could be used to detect drones at higher altitudes.
Drone recognition would help in protecting infrastructure. In WWII ships had silhouette sheets to recognize enemy ships. We now need 3-D silhouette sheets for drone recognition.
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