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| Positioning and Dimension Measurement of Micro-channel Heat Exchangers Based on 3D Vision |
| SHU Zi-chao,CAO Song-xiao,JIANG Qing,XU Zhi-peng,LOU Xu-dong |
| College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China |
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Abstract To realize the automation and intellectualization of micro-channel heat exchanger production line, a 3D vision based automatic corner location and dimension measurement method for micro-channel heat exchanger was proposed to guide the manipulator to grasp and load and unload. First, the product was photographed with a 3D camera from the top view, the obtained image was corrected and the RGB image was aligned to the depth image. Secondly, with the help of 3D information of the product, accurate two-dimensional image segmentation and two-dimensional coordinate positioning were realized. Finally, the depth values of the corner points were weighted, and the three-dimensional coordinates were obtained through the conversion of the two-dimensional coordinates and depth information of the corner points, and the product dimension was calculated. The experimental results show that the algorithm can achieve accurate image segmentation and size measurement in complex background, and the relative error of dimension measurement can be controlled within 1% when the measurement distance is 4000mm, which can meet the requirement of the system.
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Received: 15 March 2021
Published: 19 September 2022
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2022, Vol. 43 
