controlling {HEAD ~ the reading} and writing of signals to and from {TAIL ~ said memory}, respectively, in said zoom operation processing circuit 
to
controlling { HEAD ~ the reading } and writing of signals to and from { TAIL ~ said memory } , respectively , in said zoom operation processing circuit
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH