| 摘要 |
Disclosed is a system for locating a laser spot on a screen. The system includes a projector, a laser pointer, a camera, a diffractive optical element, and a computer. The projector casts an image on the screen. The laser pointer casts the laser spot on the screen. The camera takes a picture corresponding to the image on the screen. The diffractive optical element is put between the screen and the camera in order to transform the laser spot into an easily observable diffractive pattern in the picture. The computer receives the picture from the camera and locates a semi-cursor on a display connected thereto based on the diffractive pattern in the picture.
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