Detecting and tracking rogue drones is not always straight forward. EPFL researchers have used a camera to detect and track flying drones. The idea involves using artificial intelligence and deep learning to teach the camera to recognize drones.
The algorithm combines with a lightweight camera similar to smartphone cameras to complete this. As they explain:
The existing database of images, however, is limited. So Rozantsev filled in the gaps by generating realistic synthetic images. The generated images, which are based only on a small set of real examples and a coarse 3D model of the object, are used together with the real examples to train the detector