A target tracking method includes representing {HEAD ~ a human target} with {TAIL ~ a machine readable model} configured for adjustment into a plurality of different poses and receiving an observed depth image of the human target from a source 
with
A target tracking method includes representing { HEAD ~ a human target } with { TAIL ~ a machine readable model } configured for adjustment into a plurality of different poses and receiving an observed depth image of the human target from a source
OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH