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