{HEAD ~ The optical intensity pattern} of 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 
{ HEAD ~ The optical intensity pattern } of 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
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 OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH