| 主权项 |
1. A projector comprising:
a light source for outputting light; a projection unit configured to scan the light output by the light source over a projection surface in a direction oblique to the projection surface to project an image onto the projection surface; a condenser lens for focusing, on an imaging point, reflected light, which is a portion of the light scanned by the projection unit, reflected off an object; a photodetector having a detector surface for sensing the reflected light focused on the imaging point; and a controller which images first reflected light focused by the condenser lens and second reflected light focused by the condenser lens at a same imaging point on the detector surface of the photodetector, the first reflected light being light reflected off the object at a position a predetermined height above a first region of the projection surface, the second reflected light being light reflected off the object at a position the predetermined height above a second region of the projection surface, the second region being closer to the photodetector than the first region is. |
