Research on detection method of end gap of piston rings based on area array CCD and image processing

Yan Sun; Zhong Wang; Qi Liu

doi:10.1117/12.917542

15 November 2011 Research on detection method of end gap of piston rings based on area array CCD and image processing

Yan Sun, Zhong Wang, Qi Liu

Proceedings Volume 8335, 2012 International Workshop on Image Processing and Optical Engineering; 83350Z (2011) https://doi.org/10.1117/12.917542
Event: 2012 International Workshop on Image Processing and Optical Engineering, 2012, Harbin, China

Abstract

Piston ring is one of the most important parts in internal combustion engine, and the width of end gap is an important parameter which should be detected one by one. In comparison to the previous measurements of end gap, a new efficient detection method is presented based on computer vision and image processing theory. This paper describes the framework and measuring principle of the measurement system. In which, the image processing algorithm is highlighted. Firstly, the partial end gap image of piston ring is acquired by the area array CCD; secondly, the end gap edge contour which is connected by single pixel is obtained by grayscale threshold segmentation, mathematical morphology contour edge detection, contour trace and other image processing tools; finally, the distance between the two end gap edge contour lines is calculated by using the least distance method of straight-line fitting. It has been proved by the repetitive experiments that the measurement accuracy can reach 0.01mm. What's more, the detection efficiency of automatic inspected instrument on parameters of piston ring based on this method can reach 10~12 pieces/min.

Citation Download Citation

Yan Sun, Zhong Wang, and Qi Liu "Research on detection method of end gap of piston rings based on area array CCD and image processing", Proc. SPIE 8335, 2012 International Workshop on Image Processing and Optical Engineering, 83350Z (15 November 2011); https://doi.org/10.1117/12.917542

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