the encoded region having been encoded as a skipped region, if {HEAD ~ the error measure} is less than {TAIL ~ a specified threshold value}; otherwise, the encoded region having been encoded as the temporary encoded region 
is less than
the encoded region having been encoded as a skipped region , if { HEAD ~ the error measure } is less than { TAIL ~ a specified threshold value } ; otherwise , the encoded region having been encoded as the temporary encoded region
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH