To allow a calibration processing with a simple system and without a particular device.
A calibration method of a projector 1 equipped with an encoder 34 to output an encoded value corresponding to an aperture value of a diaphragm ring 31 embedded in a projection optical unit 4 comprises a first position information acquisition step to obtain first position information corresponding to a maximum aperture value of the diaphragm ring 31, a second position information acquisition step to obtain second position information corresponding to a minimum aperture value of the diaphragm ring 31 and a correlation data generation step to generate a correlation data indicating a correlation between the aperture value of the diaphragm ring 31 and the encoded value.
Osamu Suzawa
Kazuhiko Miyasaka