{HEAD ~ The resulting sequence} of {TAIL ~ comparisons} is a dither coded signal representation of the line being scanned, which is compensated for nonuniform background illumination of the image field 
of
{ HEAD ~ The resulting sequence } of { TAIL ~ comparisons } is a dither coded signal representation of the line being scanned , which is compensated for nonuniform background illumination of the image field
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH