| 摘要 |
There are provided an infrared LED panel for always applying infrared light to the back surface of a semi-transparent screen, a CCD camera for capturing only infrared light coming from the semi-transparent screen, and a projector for projecting an image onto the semi-transparent screen (with light not including infrared light). When a user performs a manipulation on the front side of the semi-transparent screen, the quantity of reflected infrared light varies. A control device picks up a variation in reflection light quantity as detection image information based on an imaging signal of the CCD camera. Further, in accordance with manipulation information that is obtained based on the detection image information, the control device executes controls necessary for, for instance, switching of an interface image to be displayed on the semi-transparent screen. A manipulation method may be in such a form as to cause a variation in detection image information through reflection of infrared light. Interactive input/output with various manipulation methods is thus enabled.
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