基于改进Canny算法的石英玻璃环内外径测量方法

Measurement Method of Inner and Outer Diameters of Shi Ying Glass Ring Based on Improved Canny Algorithm

摘要:

针对石英玻璃环在工业检测中易受反射、低对比度干扰而导致测量精度低等问题，提出了基于改进Canny算法的石英玻璃环内外径测量方法。采用低角度成像与高角度均匀照明获取石英玻璃环图像，通过双边滤波进行图像预处理，抑制噪声并保留边缘轮廓特征信息；通过融合自适应平滑滤波、多方向梯度计算及Otsu自适应阈值优化的改进Canny算法，提高了石英玻璃环轮廓特征精度，采用最小二乘拟合法建立石英玻璃环内外径测量模型。实验结果表明，该方法对常见石英玻璃环的内外径测量测量误差小于±0.05 mm，与人工测量方法相比具有更高的稳定性，测量效率较传统人工接触式测量显著提升。

Abstract:

Aiming at the problem that Shi Ying glass ring is easily influenced by reflection and low contrast interference in industrial inspection, a method for measuring the inner and outer diameters of Shi Ying glass ring based on improved Canny algorithm is proposed. The image of Shi Ying glass ring is obtained by low-angle imaging and high-angle uniform illumination, and the image is preprocessed by bilateral filtering to suppress noise and retain edge contour feature information. The improved Canny algorithm, which combines adaptive smoothing filtering, multi-directional gradient calculation and Otsu adaptive threshold optimization, improves the accuracy of Shi Ying glass ring contour features, and establishes the measurement model of Shi Ying glass ring inner and outer diameters by least square fitting method. The experimental results show that the measurement error of the inner and outer diameters of common Shi Ying glass rings by this method is less than ±0.05 mm, and it has higher stability compared with manual measurement, and the measurement efficiency is significantly improved compared with traditional manual contact measurement.