| 摘要 |
An interactive display (100) is provided by providing a user with a perceivable visible image on an image layer (102) configured to and configured to pass through infrared light, capturing an infrared image through the image layer (102), and detecting (303) from the infrared image contact areas where a pointing object (112) is located at the image layer (102) and casts in the infrared image a corresponding shadow, the shadow comprising a peripheral region corresponding to the shape of the pointing object (112) and a central region surrounded by the peripheral region. The detecting (303) of the contact area is performed under daylight, or corresponding strong and coherent ambient infrared illumination, from at least two of the following characteristics present in the shadow of the pointing in the infrared image: darkness of the shadow; gradient of the darkness of the shadow at the edge region; sharpness of the edge region; and dimensions (310) of the shadow. |
