| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a position detection apparatus that can detect accurately a position on a display screen, indicated by an indicating unit even when there is an obstacle. <P>SOLUTION: The position detection apparatus includes an indicating unit 2 for projecting light onto the front surface of a display screen 11 on which the video images of a projector 12 are projected from the back surface side, an imaging means 3 placed at the back of the display screen 11 for picking up the light projected onto the display screen 11 by the indicating unit 2 from the back surface side of the display screen 11 and converting it into electric signals, and an image processing means 4 for analyzing the electric signals from the imaging means 3 and calculating the coordinate position on the display screen 11 of the indicating unit 2. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
