| 摘要 |
A method and system for determining the position of a first object relative to a second object are disclosed. The method comprises providing a sheet having has a first surface, a second surface, and at least one optically detectable feature. The second surface of the sheet is placed adjacent a surface of the second object. The method further comprises providing an imaging system fixedly associated with the first object. The imaging system is placed adjacent the sheet first surface and is moved along with the first object relative to the sheet. The imaging system images planar portions of the sheet, including the optically detectable feature. Additionally, the imaging system identifies the locations of the optically detectable feature relative to the imaging system as the first object and the imaging system are moved relative to the sheet. The imaging system measures the amount and direction of the relative movement between the imaging system and the optically detectable feature. The relative movement between the first object and the second object is then readily determined, which in turn, yields the position of the first object relative to the second object.
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