Vision automatic positioning system of ruby bearing in a coordinate measuring machine
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1.
State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China;
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2.
Key Laboratory of MOEMS Technology of Ministry of Education, Tianjin University, Tianjin 300072, China;
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3.
707 Institute, China Ship-building Industry Corporation, Tianjin 300131, China;
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4.
8358 Institute, China Aerospace Science and Industry 3rd Corporation, Tianjin 300308, China;
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5.
College of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China
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Corresponding author:
LI Xing-fei, lixf@tju.edu.cn
;
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Received Date:
2012-05-21
Accepted Date:
2012-06-29
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Abstract
To improve the positioning accuracy of small objects, a direct positioning scheme was proposed based on machine vision. Besides, relevant theoretical analysis and experimental verification were carried out. By analyzing the optical features of ruby bearings, a vision automatic positioning system was designed, and image algorithms were used to get the center of the hole. The top of the probe on coordinate measuring machine was used as an ideal target for camera calibration, so the coefficients of coordinate transformation between camera system and the coordinate measuring machine was calculated. Experiments show that the positioning accuracy of the system is up to 0.01mm, which fulfills the requirement of positioning.
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