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