To execute appropriate antiglare processing by easily determining a case where a person giving presentation enters in a projection range.
A projection auxiliary device comprises: an input unit 11 inputting a picture signal; a projection system 13-18 projecting an image corresponding to the picture signal from the input unit 11 using light emitted from a light source unit 16; an antenna 26 and a pointer communications unit 24 receiving information about reduction of luminance from external devices existing in a range within which the projection system 13-18 projects the image; and a CPU 19 determining whether or not the received information instructs reduction of the luminance of the image to be projected by the projection system 13-18 and reducing the luminance of the image to be projected by the projection system 13-18 on the basis of the determination result.
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Takakura Shigeo
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Morisezo Iseki
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Next Patent: LIGHT SOURCE DEVICE AND PROJECTOR DEVICE