1. Computer Vision and Aerial Robotics Group, Centre for Automation and Robotics (C.A.R.), Universidad Politécnica de Madrid (U.P.M.-CSIC), 28006 Madrid, Spain
2. Wake Engineering Company, 28906 Madrid, Spain
3. Department of Electrical Engineering, University Carlos III of Madrid, 28919 Madrid, Spain
4. Drone-Hopper Company, 28919 Madrid, Spain
5. Institute of Computer Science, Romanian Academy–Iași Branch, Codrescu 2, 700481 Iasi, Romania
6. Department of Network, Faculty of Information Systems and Computer Science, October 6 University, Giza 12511, Egypt