Although FIG 15 shows processing in {TAIL ~ the vertical direction}, processing in {HEAD ~ the horizontal direction} can be performed similarly to that in the vertical direction by providing a sample hold circuit in lieu of the line memory 
Although FIG 15 shows processing in { TAIL ~ the vertical direction } , processing in { HEAD ~ the horizontal direction } can be performed similarly to that in the vertical direction by providing a sample hold circuit in lieu of the line memory
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH 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