| 摘要 |
A method of establishing the position of a target on an object (24), he method comprising the steps of: identifying one or more features (26a, 26b, 26c) associated with the object, the features being located at known positions on the object; applying a first target (3) to the object; establishing a datum co-ordinate system for the object based on the determined location of the features associated with the object; and, measuring using optical measuring means (6a, 6b) the position of the first target on the object to relative to the one or more features so as to determine the location of the target on the object.
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