or
This has a main application of "target recognition" for military uses. In order to do this, we took some pictures on our own (since not many would most likely be readily available to us) using toy tanks, helicopters, and ambulances (micro machines, in fact) and toy trees and rocks to simulate a tank driving around somewhere.
We also took pictures on a variey of backgrounds in order to simulate the fact that not all places look alike, and we could want to monitor a tank in a variety of locations.