Apparatus is provided for comparing the difference in the signals between the superimposed document and for analyzing the difference to provide {HEAD ~ a signal} related to {TAIL ~ the copy quality} 
related to
Apparatus is provided for comparing the difference in the signals between the superimposed document and for analyzing the difference to provide { HEAD ~ a signal } related to { TAIL ~ the copy quality }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL