基于数据拟合的激光焊接焊缝图像表面缺陷检测

为了检测等厚钢板激光焊接焊缝表面缺陷，采用结构光主动视觉检测法和数据拟合技术进行了焊缝图像表面缺陷检测的实验研究。首先采用高斯拟合法提取出具有亚像素精度的激光条纹图像中心线；然后通过最小二乘法拟合出2条直线和1条二次曲线，求直线和二次曲线的交点以获得精确的焊缝端点位置坐标；最后给出焊缝表面缺陷：凹度和凸度的计算方法，并以等厚钢板激光焊接焊缝为检测对象进行验证。结果表明，在此提出的基于数据拟合技术的焊缝表面缺陷图像检测方法为判断激光焊接焊缝质量是否合格提供了较为准确的判断依据。

Surface Defect Detection of Laser Welding Seam Based on Data Fitting Technology

In order to detect the defects of equal-thickness steel plate laser welding seam surface,the structured light active vision method and data fitting technology were used for the experiment research on the seam surface defects detection.Firstly,the laser strip center line with sub-pixel accuracy was extracted by Gaussian fitting.Secondly,the seam endpoint position was gained by computing intersection point of line and conic after two lines and one conic were obtained by data fitting.Thirdly,the surface defect...