Method for identification of characteristic points of a calibration pattern within a set of candidate points in an image of the calibration pattern

A method for identification of characteristic points of a calibration pattern within an image of the calibration pattern, the method comprising the steps of

• for each candidate point of a set of candidate points derived from the image of the calibration pattern:
• overlaying a template arrangement of template points over the candidate point such that a principal point of the template points coincides with the candidate point, wherein the template arrangement corresponds to the calibration pattern or to a sub-pattern of the calibration pattern,
• for each template point of the overlaid template arrangement, except the principal point, identifying from the set of candidate points the candidate point closest to the template point, and
• determining a degree of deviation by summing the distances between each template point of the template arrangement, except the principal point, and the candidate point closest to this template point;
• and
• identifying as characteristic points of the calibration pattern all those candidate points of the set of candidate points with a degree of deviation below a deviation threshold.