Shaft diameter measurement using a digital image |
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| Institution: | 1. College of Basic Science, Changchun University of Technology, Yanan Street, Changchun, China;2. College of Mechanical Science and Engineering, Changchun University, Changchun, China;3. College of Mechanical Science and Engineering, Jilin University, Changchun, China;1. School of Mathematics, Changchun Normal University, Changji Highway (North) 677, Changchun, China;2. Department of Computer Science and Technology, Changchun Normal University, Changchun, China;1. School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, PR China;2. Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, PR China;3. Shaanxi Diesel Engine Heavy Industry Co., Ltd, Xingping, Shaanxi 713105, PR China |
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| Abstract: | In this paper, a non-contact and high-precision method based on the processing of a digital image is presented to measure the diameter of a shaft. The method mainly involves three steps: first, the camera is calibrated by an improved approach, which only uses the feature points in the measurement area of the image to optimise the local camera model; second, with the help of the parameters of the model in the first step, a measurement method for determining the shaft diameter is proposed; finally, to embody the spatial attitude of the shaft accurately, the extrinsic parameters are re-calibrated by measuring a shaft whose diameter is known, and then the precision of measurement is improved by means of the new extrinsic parameters. The experimental data demonstrate that the proposed method exhibits high precision, with relative errors of approximately 0.005 mm. |
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| Keywords: | Image measurement Camera calibration Image distortion Shaft diameter |
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