 replacing, by the motion coordinate calculator, the reference image previously set in {TAIL ~ the X channel reference unit} with the pre processed current central image when it is determined at the step that {HEAD ~ the X axis motion vector} has a value other than zero 
replacing , by the motion coordinate calculator , the reference image previously set in { TAIL ~ the X channel reference unit } with the pre processed current central image when it is determined at the step that { HEAD ~ the X axis motion vector } has a value other than zero
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH