基于改进Canny算法和Hough变换的脉冲氩弧焊坡口边缘提取研究  

Study on Groove Edge Extraction During Pulsed Argon Arc Welding Based on Improved Canny Algorithm and Hough Transform

作　　者：吴涛 刘卫华 张旺 陆皓[3] 丁超 谢忠奇 郭彦兵 WU Tao;LIU Weihua;ZHANG Wang;LU Hao;DING Chao;XIE Zhongqi;GUO Yanbing(School of Mechanical Engineering,Shanghai Dianji University,Shanghai 201306,China;China Nuclear Industry Fifth Construction Co.,Ltd.,Shanghai 201512,China;School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海电机学院机械学院,上海201306 [2]中国核工业第五建设有限公司,上海201512 [3]上海交通大学材料科学与工程学院,上海200240

出　　处：《热加工工艺》2024年第9期23-27,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51975346)。

摘　　要：针对脉冲氩弧焊中被动光传感采集的图像存在光亮变换快,目标像素少,难以提取出坡口的问题,提出一种基于改进阈值选择和双阈值检测的Canny算法。通过中值滤波和双边滤波代替传统Canny算法中的高斯滤波对图像进行滤波,引入背景像素与前景像素的数量比改进Otsu算法的最大方差,计算得到了靠近坡口的梯度值的阈值,依据改进后的双阈值检测获得完整的坡口边缘信息,对边缘信息进行Hough变换提取出清晰的坡口边缘。实验结果表明,和传统Canny算法相比,改进后的Canny算法提取坡口成功率提高,获得的坡口边缘信息也更加完整。The image collected by the passive light sensor during pulsed argon arc welding has the problems of fast light transformation,few target pixels,and it is difficult to extract the groove.A Canny algorithm based on improved threshold selection and double-threshold detection was proposed.The image was filtered by median filtering and bilateral filtering instead of Gaussian filtering in the traditional Canny algorithm,the number ratio of background pixels to foreground pixels was introduced to improve Otsu's maximum variance,and the threshold of the gradient value near the groove was calculated.The complete groove edge information was obtained by the optimized double-threshold detection,and the edge information was subjected to Hough transform to extract the clear bevel edge.The experimental results show that,compared with the traditional Canny algorithm,the improved Canny algorithm improves the success rate of groove extraction,and obtains more complete groove edge information.

关 键 词：被动光 坡口 CANNY算法 OTSU算法 HOUGH变换 

分 类 号：TG409[金属学及工艺—焊接]