 determining, by the motion coordinate calculator, whether or not a Y axis motion vector corresponding to {HEAD ~ the calculated Y axis motion} has {TAIL ~ a value} of zero 
has
determining , by the motion coordinate calculator , whether or not a Y axis motion vector corresponding to { HEAD ~ the calculated Y axis motion } has { TAIL ~ a value } of zero
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 HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH