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