a controller adapted to {TAIL ~ control} said display unit so as to reduce a difference between the input image data and the image displayed on {HEAD ~ the display surface} by said display unit, based on a plurality of image data input to said display unit, and images which correspond to the plurality of image data and are acquired by said acquisition unit, 
a controller adapted to { TAIL ~ control } said display unit so as to reduce a difference between the input image data and the image displayed on { HEAD ~ the display surface } by said display unit , based on a plurality of image data input to said display unit , and images which correspond to the plurality of image data and are acquired by said acquisition unit ,
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH