Referring now to the first case described above, that is, a changing human figure over time, irrespective of {HEAD ~ the orientation} of {TAIL ~ the device}, this may be a series of sequential images or a video 
of
Referring now to the first case described above , that is , a changing human figure over time , irrespective of { HEAD ~ the orientation } of { TAIL ~ the device } , this may be a series of sequential images or a video
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH