“…Regarding RQ 1 , we found that the most frequently implemented system functions for drone video cameras have been taking photos [7,8,13,33,36] and selfies [1,[8][9][10]13,30,36], while commands for recording videos have been addressed to a less extent [7,36]. We identified six types of system functions relevant to our scope: (1) take selfie, (2) take picture, (3) take picture of a specified object, (4,5) start/stop video recording, and (6) stream video from the drone.…”