{HEAD ~ This invention} relates to {TAIL ~ the restoration} of image signals from a photosensitive scanning array to provide an absolute output signal level 
{ HEAD ~ This invention } relates to { TAIL ~ the restoration } of image signals from a photosensitive scanning array to provide an absolute output signal level
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH