generating, by the mobile device, a first control signal based on the least one of the movement of the captured entity and {HEAD ~ the change} of {TAIL ~ size} of the captured entity, the control signal controlling the display apparatus 
of
generating , by the mobile device , a first control signal based on the least one of the movement of the captured entity and { HEAD ~ the change } of { TAIL ~ size } of the captured entity , the control signal controlling the display apparatus
OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH