{HEAD ~ The system} further includes a programmed computer that determines whether each pixel is a constant area pixel or {TAIL ~ an edge area pixel} 
{ HEAD ~ The system } further includes a programmed computer that determines whether each pixel is a constant area pixel or { TAIL ~ an edge area pixel }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL