| 摘要 |
We describe a touch sensitive image display device, the device comprising: an image projector to project a displayed image onto a surface; a touch sensor optical system to project light defining a touch sheet above said displayed image; a camera directed to capture a touch sense image from a region including at least a portion of said touch sheet, said touch sense image comprising light scattered from said touch sheet by an object approaching said displayed image; and a signal processor coupled to said camera, to process a said touch sense image from said camera to identify a location of said object relative to said displayed image; wherein said object is provided with a retroreflective element to reflect light from said touch sheet. |
