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