{HEAD ~ An image processing system} employs {TAIL ~ a scanner} to generate an image having gray content from an input halftone image 
{ HEAD ~ An image processing system } employs { TAIL ~ a scanner } to generate an image having gray content from an input halftone image
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH