The apparatus includes a 50% transmission/50% reflection mirror, a vidicon for scanning the original and its copy through the mirror, means for reading out the vidicon images of the original and the copy, and {HEAD ~ means} for comaring and analyzing {TAIL ~ the copy} and the original for generating a comparison signal 
The apparatus includes a 50 % transmission/50 % reflection mirror , a vidicon for scanning the original and its copy through the mirror , means for reading out the vidicon images of the original and the copy , and { HEAD ~ means } for comaring and analyzing { TAIL ~ the copy } and the original for generating a comparison signal
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