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