The optical intensity pattern of {HEAD ~ a two dimensional image field} is electrically scanned a line at a time by a shift register access technique, thus providing a first stream of {TAIL ~ bits} for each line 
The optical intensity pattern of { HEAD ~ a two dimensional image field } is electrically scanned a line at a time by a shift register access technique , thus providing a first stream of { TAIL ~ bits } for each line
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH