sensing, by the mobile device at least one of {HEAD ~ a movement} of {TAIL ~ the captured entity} and a change of size of the captured entity according to a movement of the mobile device 
of
sensing , by the mobile device at least one of { HEAD ~ a movement } of { TAIL ~ the captured entity } and a change of size of the captured entity according to a movement of the mobile device
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH