Abstract：Aiming at the vibration has a great influence on the measurement results during visual on-line measurement of nylon zippers thickness dimension, through analyzed of the zipper vibration mechanism, the motion equation of the transverse vibration model of zipper under vibration condition was established and its definite solution was obtained. Then combined with the principle of LK optical flow method, the global vibration information of zipper at a certain moment was obtained. On this basis, an visual on-line measurement algorithm for thickness dimension of nylon zipper under vibration condition was proposed. Firstly, the coordinates of the measured zipper edge point in the image to be compensated were extracted. Secondly, the coordinates of edge points were modified according to the motion compensation algorithm. Then the coordinates of edge points were fitted into parallel lines by least square method and the spacing of the parallel lines was calculated. Finally, the spacing was converted to the actual thickness dimension of the zipper according to the pixel equivalent. The experimental results show that the uncertainty of the measurement results of this algorithm is 0.00051mm, which is far better than the measurement results of the vision measurement method without motion compensation,which can effectively suppress the impact of zipper vibration on the measurement results.
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2021, Vol. 42 
