“…With the benefits of natural and intuitive interactions, and free from sanitation problems in public spaces, the applications of mid-air hand gestures included interactive navigation systems in museum or virtual museum [3,4], medical or surgical imaging system [5,6,7,8], large display interactions [9], interactive and public display [10], and 3D modelling [11,12,13,14]. Based on previous research, mid-air hand gestures could be analyzed in five gesture types: pointing, semaphoric, pantomimic, iconic, and manipulation [15].…”