Abstract: A calibration for an AR gaming system or method so that players equipped with AR capable devices such as handheld devices can join in an augmented reality game in an area such as a lobby of premises such as a cinema, shopping mall, museum, airport hall, hotel hall, attraction park, etc. The lobby L is equipped with digital Visual equipment and optionally Audio equipment connected to a digital signage network, In particular, the lobby L is populated with one or more display devices, such as fixed format displays, for instance LC displays, tiled LC displays, LED displays, plasma displays or projector displays, displaying either monoscopic 2D or stereoscopic 3D content. These displays are used to allow onlookers to see through a window onto the virtual world of the AR game.