determining means for determining whether each pixel signal read by {TAIL ~ the image reading means} represents {HEAD ~ a white pixel} and for generating a white pixel signal representing the white pixel 
determining means for determining whether each pixel signal read by { TAIL ~ the image reading means } represents { HEAD ~ a white pixel } and for generating a white pixel signal representing the white pixel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH