| 摘要 |
<p>This invention provides a method and apparatus for position determination of a worktool in for example positioning equipment such as sensing, moving, marking or machining equipment. The method and apparatus comprises at least one reference pattern (g) in a known relation to a workpiece (m), means for imaging at least a portion of said reference pattern (c and d) with said means in a known relation to said worktool (b) and means for processing said image to determine one or more points on said image whereby said points accurately determine the position of said worktool (b) relative to said workpiece (m). Markings may be included on said reference pattern which specify spatial coordinates of particular points on said pattern. Calibration data may be included which specifies corrections to spatial coordinates of particular points on said reference pattern. Means may be included for calibrating and/or monitoring dimensional changes in at least said reference pattern and/or said workpiece and/or said sensors.</p> |
