Abstract
Automated dimensional inspection is commonly expensive because of the requirement of high-precision measurement devices. To perform a precision measurement, the technician must be highly skilled and fully understands the operation of the equipment. This study proposes a method for reconstructing the two-dimensional profiles of ring-shaped objects using image processing. At first, an industrial camera captures partial images of the object. After that, through several image processing procedures such as binarization, line detection, and contour recognition, the profiles in the images were detected and grouped. Then, a calibration model was introduced to calibrate and combine the contours from partial images. This process results in a point cloud consisting of every point from the outer and inner contours of the object, which can be directly used for the automatic measurement. To verify the proposed method, the data were compared with those acquired from the ATOS measurement system, revealing a favourable correlation.
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Acknowledgements
The authors would like to acknowledge the financial support from the Ministry of Science and Technology, Taiwan. The authors would like to thank Linesoon Industrial Co., Ltd. (Taiwan) for providing the measurement specimens and for valuable discussion.
Funding
This research was partially funded by the Ministry of Science and Technology, Taiwan, under grant number MOST 106-2622-E-151-017-CC3.
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Anh-Tuan Dang: formal analysis, investigation, software, writing-original draft, visualization. Quang-Cherng Hsu: data curation, funding acquisition, methodology, project administration, resources. Tat-Tai Truong: review, visualization and editing.
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Dang, AT., Hsu, QC. & Truong, TT. A simple method for dimensional measurement of ring-shaped objects using image processing technique. Int J Adv Manuf Technol 115, 3657–3678 (2021). https://doi.org/10.1007/s00170-021-07416-5
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DOI: https://doi.org/10.1007/s00170-021-07416-5