In some embodiments, the original body part index of {HEAD ~ a synthesized pixel} may be nil if the synthesized pixel does not correspond to a body part of {TAIL ~ the target}  
In some embodiments , the original body part index of { HEAD ~ a synthesized pixel } may be nil if the synthesized pixel does not correspond to a body part of { TAIL ~ the target }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH