{HEAD ~ The image detecting module} 230 can detect {TAIL ~ a first optical information} about the touch point C and the mirror point C1 
detect
{ HEAD ~ The image detecting module } 230 can detect { TAIL ~ a first optical information } about the touch point C and the mirror point C1
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH