多重抗干扰策略的销轴圆孔视觉测量方法

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中图分类号：TB9;TP391.41;TG806

文献标志码：A 文章编号：1674-5124（2025）11-0074-10

Abstract： Circular holes on pin shaft play an important role in precise positioning and limit reference in mechanical structures.Aiming at the interference problems caused by reflections from the inner wallof the hole and inverted edges at the hole opening， which afect the recognition and measurement of circular holes， a vision measuring method of pin shaft circular holes based on multiple anti-interference strategies is proposed. This method constructs a model for connected domain area screening， and processes threshold - segmented images with morphological methods，accurately removing interference from burrs，iron filings，and inverted edge reflections distributed in a circular shape around the outer circumference of the circular hole. It combines the rough and fine positioning of the circular hole contour.A distance constraint condition is set based on the theoryof random circle，and an interference point removal model is established to eectively remove interference data points reflected from the inner wallof the hole，achieving high-precision measurementof the pin shaft circular hole.The double headed perforated pinshaft is the experimental object，and a visual system for measuring the circular hole of the pin shaft is built.The proposed method is compared with three common circular measurement methods，least squares fiting circle （LSFC）， hough transform with gradient （GHT）， and the centroid method. And the proposed method is compared with the measurement values of line laser 3D shape measurement system. The results show that the proposed method has significant advantages in detecting the pin circular hole， with a maximum error of 0.007mm and a standard deviation of about 1/10 to 1/3 of other vision methods. The error of the proposed vision measurement method is reduced to 1/7of that of line laser measurement.

Keywords：machine vision; circular hole measurement; anti-interference; circle fittint

0 引言

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