Feature Size Measurement of Multihole Sheet Metal Part Based on HALCON

Abstract:

To realize the target of having a precise feature size measurement of multihole sheet metal part, this paper based on HALCON, first calibrates the camera with HALCON's calibration assistant. After acquiring the image of the multihole sheet metal part, the image coordinates of the center of fitting ellipse and the length of the long and short half shaft (pixel unit) can be gotten by proceeding a series of operations like thresholding, subpixel-precise contour extraction, fitting ellipses and so on. At last, the point coordinates in image are transformed into the plane Z=0 of the world coordinate system through translation and rotation, and the value of each feature size of the sheet metal part can be calculated.

• Periodical: Applied Mechanics and Materials (Volume 302)
• Pages: 546-549
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.302.546
• Online since: February 2013
• Authors: Baoan Han, Hui Yu Xiang, Zhe Li, Xiao Zhuang Zhou
• Keywords: Calibration Assistant, Fitting Ellipses, HALCON, Multihole Sheet Metal Part, Subpixel

References

[1] Yuanyuan Wu. High speed sorting manipulator visual identification technology research [D]. Wuxi: Jiangnan University, (2009).

[2] Yifeng Chen. Halcon's application in two dimensional size detection [J]. Electromechanical technology, 2011, 12(4): 12.

[3] Steger. C, Ulrich. M, Wiedemann.C. Machine vision algorithm and application [M]. Translated by Shaorong Yang. Beijing: Tsinghua University Press, 2008: 218-245.