wherein said controller controls said {HEAD ~ display unit} to display {TAIL ~ the image} after correcting the input image data, based on the estimated ratio 
to display
wherein said controller controls said { HEAD ~ display unit } to display { TAIL ~ the image } after correcting the input image data , based on the estimated ratio
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH