Method for measuring object location by phase detection using a fixed observation system and a digital processor to process measurement data from a two dimensional periodic test marker fixed to the object being located

摘要

Method for measuring the location of an object (5) in an observation space by use of a fixed observation system (1) connected to a processing unit (4) for generation of an image comprising a pixel matrix. The object is provided with a test marker (8). The marker comprises at least one 2-D, periodic pattern. Digital processing of the marker image is carried out to produce an image comprising first and second networks, which are digitally analyzed to calculated the position of the test marker within the pixel matrix.