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