QIN Xun-peng,DING Ji-xiang,DONG Huan-yu,et al.Calibration of cross structured light based on linear space rotation[J].Optics and Precision Engineering,2021,29(06):1430-1439.
QIN Xun-peng,DING Ji-xiang,DONG Huan-yu,et al.Calibration of cross structured light based on linear space rotation[J].Optics and Precision Engineering,2021,29(06):1430-1439. DOI: 10.37188/OPE.20212906.1430.
Calibration of cross structured light based on linear space rotation
Aiming at the rapid and high-precision calibration of cross structured light in the measurement of complex surface features, we propose a cursor calibration method for the cross structured light based on linear space rotation. We used the Otsu thresholding algorithm to select the best threshold for extracting the area where the light bar was located, and the Steger algorithm based on the Hessian matrix and the least square method were able to extract and fit the center of the light strip. After the construction of feature point pairs in the image and the target plane, the random sample consensus (RANSAC) algorithm was used to solve the homography matrix, and a straight line was transformed to obtain the linear equation of the light bar in the target plane. The straight line was then converted into the camera coordinate system. From the rotation transformation relationship of the space straight line around any axis, the light strips were rotated around the projection centerline, and the two straight lines before and after the rotation were plane fitted to solve the light plane equation parameters. The results showed that the average error when using this method to measure the distance between the target centers was 0.023 mm and that the root mean square error was 0.026 mm. This method can achieve higher measurement accuracy and can avoid multiple movements of the target plane.
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