The camera calibration is the basis of putting the computer vision technology into practice. This paper proposes a new
method based on camera calibration for diameter measurement of gear, and analyses the error from calibration and
measurement. Diameter values are gained by this method, which firstly gets the intrinsic parameters and the extrinsic
parameters by camera calibration, then transforms the feature points in image coordinate extracted from the image plane
of gear to the 3D world coordinate, lastly computes distance between the features points. The experiment results
demonstrate that the method is simple and quick, and easy to implement, highly precise, and rarely limited to the size of
target.
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