distributor :-
int split = 8;
for (y < IMHT)
  for (x < IMWD)
      c_in :> val;
      if (y < split-1)
         if (x < split-1) send to worker 1
         else if (x < split+1) send to worker 1 and 2
         else send to worker 2
      else if (y < split + 1)
         if (x < split-1) send to worker 1 and 3
         else if (x < split+1) send to worker 1, 2, 3 and 4
         else send to worker 2 and 4
     else
         if (x < split-1) send to worker 3
         else if (x < split+1) send to worker 3 and 4
         else send to worker 4