Method of calibrating cameras for measuring an article

Details Method of calibrating cameras for measuring an article Method of calibrating cameras for measuring an article

G - Physics

01

B

33/45

G01B 11/14 (2006.01) G01B 11/02 (2006.01)

Patent

CA 1229975

- 1 - ABSTRACT A method and apparatus for calibrating cameras for measuring the dimension of an article is disclosed in which a calibration frame 20 having reference points 22-40 is located in the field of view of the cameras, Calibration constants are drive from the reference points as perceived by the camera having regard to known displacements. The calibration constants are used in equations which give the dimensions of the article in a subsequent measurement step which take into account perspective distortions due to the positional relationship between the cameras and calibration frame and therefore the article during the measurement step.

476081

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