A method of controlling {HEAD ~ a display apparatus} using {TAIL ~ a camera based device} and a mobile device, display apparatus, and system applying the same are provided 
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A method of controlling { HEAD ~ a display apparatus } using { TAIL ~ a camera based device } and a mobile device , display apparatus , and system applying the same are provided
OTH 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 OTH OTH OTH OTH OTH