“…In the last years, technological advances in miniaturized sensors/actuators and optimized data processing have lead to extensive use of small autonomous flying vehicles within the academic, military, and (more recently) commercial contexts (see [11,32,34] and references therein). Thanks to their high maneuverability and versatility, Unmanned Aerial Vehicles (UAVs) are rapidly increasing in popularity, thus becoming a mature technology in several application fields ranging from the classical visual sensing tasks (e.g., surveillance and aerial photography [17,26] to the recent environment exploration and physical interaction (e.g., search and rescue operations, grasping and manipulation [14,21,27,29,33]).…”