{HEAD ~ This filtering} results {TAIL ~ such an image} that the mean square error of the restored image f′ from the input image f is minimal 
{ HEAD ~ This filtering } results { TAIL ~ such an image } that the mean square error of the restored image f′ from the input image f is minimal
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 OTH