incrementing said position of {HEAD ~ said edge detection filter} in {TAIL ~ the first direction}, wherein the incremented position is associated with pixels of a next row of said image 
in
incrementing said position of { HEAD ~ said edge detection filter } in { TAIL ~ the first direction } , wherein the incremented position is associated with pixels of a next row of said image
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH