Method for controlling {HEAD ~ a display apparatus} using {TAIL ~ a camera based device} and mobile device, display apparatus, and system thereof 
Method for controlling { HEAD ~ a display apparatus } using { TAIL ~ a camera based device } and mobile device , display apparatus , and system thereof
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH