基于斜率分析法的焊缝条纹直线特征提取分析

提出了一种基于直线拟合的斜率分析法，用于提取线结构光焊缝条纹特征直线. 该方法将光条上的所有n个像素点按坐标大小顺序排列，从起始点开始顺次推移，每连续n0个光点进行直线拟合，共记录n-n0个斜率值，通过斜率变化特征计算光点在各条纹直线上的分布数量,以完成点集划分，根据划分后的各点集拟合直线作为求得的焊缝特征直线，最后讨论了参量n0对拟合直线的影响. 结果表明，该方法能够有效地检测角接、搭接及V形等各类焊缝特征直线，满足焊缝检测的试验现场要求.

Feature extraction and analysis of weld seam stripe line on slope analysis method

For extracting the weld seam feature lines in line structured light stripe, a slope analysis method based on linear fitting is proposed. In this method, all the n pixels in the light stripe are arranged in the order of the coordinates, progressive from the starting point, linear fittings are performed for each consecutive points, and total n0 values of the slope are recorded. The number distribution of the points in each stripe line is calculated by the change characteristics of the slope and point set division is completed. According to the division of the point set, linear fitting are performed and these fitted lines are taken as the weld seam feature lines. Finally, the influence of parameter n0 on the fitting lines is discussed. The experiment results indicate that this method can efficiently extract the feature lines in corner butt welding, overlap butt welding and V-groove welding seam and meets actual field requirements.