| 摘要 |
This is provided with a plurality of retroreflective sheets each of which is attached to a screen and retroreflectively reflects received light, an imaging unit which photographs the retroreflective sheets, and an MCU which analyzes a differential picture obtained by photographing. The MCU detects, from the differential picture, a shade area corresponding to a part of the retroreflective sheet which is covered by a foot of a player. The detection of the shade area corresponds to the detection of the foot of the player. Because, in the case where the foot is placed on the retroreflective sheet, the part corresponding thereto is not captured in the differential picture, and is present as a shade area. It is possible to detect a foot without attaching and fixing a reflecting sheet to the foot.
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