{TAIL ~ The method} 7, wherein {HEAD ~ the step} of extracting the horizontal line information comprises: 
{ TAIL ~ The method } 7 , wherein { HEAD ~ the step } of extracting the horizontal line information comprises :
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH