“…Tracking human movements is a challenging task applicable to a variety of fields, such as real-time exercise tracking [ 1 , 2 , 3 , 4 , 5 ], fall detection for the elderly [ 6 , 7 , 8 , 9 , 10 , 11 ], intrusion detection-based surveillance [ 12 , 13 ] in restricted areas such as railroad tracks and railway stations [ 14 ], etc. Wearable sensors [ 15 , 16 , 17 , 18 ] are popular for monitoring the health status in certain patients; however, these sensors only track certain vital signs and are insufficient for monitoring movement.…”