{HEAD ~ A method} for applying an edge detection filter to {TAIL ~ an image} comprising the steps of: 
{ HEAD ~ A method } for applying an edge detection filter to { TAIL ~ an image } comprising the steps of :
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH