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Abstract

A method and an apparatus serve for determining the deflection of a fastener, especially a screw. The method includes the steps of (a) recording a first image of the fastener with a first camera; (b) determining two first reference points of the fastener in the first image for determining a first reference axis of the fastener, the first reference axis extending through the two first reference points; (c) determining a first inspection point in a first inspection region in the first image; (d) comparing the position of the first inspection point with the respective position of the first reference axis for determining a first deviation; (e) recording a second image of the fastener with a second camera, the optical axis of the second camera being substantially perpendicular to the optical axis of the first camera, the optical axes of the first and second camera approximately intersecting in the longitudinal axis of the fastener; (f) determining two second reference points of the fastener in the second image for determining a second reference axis of the fastener, the second reference axis extending through the two second reference points; (g) determining a second reference point in a second inspection region in the second image; and (h) comparing the position of the second inspection point with the respective position of the second reference axis for determining a second deviation.

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