| 摘要 |
An apparatus and method for digitising the coordinates of an item (1), such as a map or X-ray image, are described. The item (1) is placed on the bed of a digitising tablet (2) and a mouse (3) is movable over the surface of the item. The mouse incorporates a television camera (6) which outputs an image signal to an associated computer (11). The image may be displayed on computer screen (10) simultaneously with a computer-generated cursor (14) which latter may be moved over the screen display to select a desired point on the image to be digitised. Positional and orientation information about the position of the mouse, and hence the scene being viewed, at any one time is determined by a pair of pick up coils(4, 8), the coordinates of whose positions are sent ot the computer. By computer analysis of the positions of the two coils (4 and 8), the position and orientation of the image on the screen can be related to the physical position of the scene being viewed, and hence the position of the cursor (14) at the selected point can likewise be determined, and stored in permanent storage. |
