{HEAD ~ A region} of {TAIL ~ an image} having a plurality of corresponding image values is encoded to generate a temporary encoded region 
of
{ HEAD ~ A region } of { TAIL ~ an image } having a plurality of corresponding image values is encoded to generate a temporary encoded region
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH