If the error measure is less than a specified threshold, then the region is encoded as a skipped region, otherwise {HEAD ~ the region} is encoded as {TAIL ~ the temporary encoded region} 
is encoded as
If the error measure is less than a specified threshold , then the region is encoded as a skipped region , otherwise { HEAD ~ the region } is encoded as { TAIL ~ the temporary encoded region }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL