| 雷凯云,秦训鹏,刘华明,倪茂.基于局部主动轮廓模型的宽带激光熔覆熔池边缘提取[J].光电子激光,2018,29(5):516~522 |
| 基于局部主动轮廓模型的宽带激光熔覆熔池边缘提取 |
| Weld pool edge extraction in wide-band laser cladding based on local region a ct ive contour model |
| 投稿时间：2017-09-06 |
| DOI： |
| 中文关键词: 主动轮廓模型 宽带激光熔覆 熔池边缘提取 局部 |
| 英文关键词:active contour model wide-bond laser cladding weld pool edge extraction loca l region |
| 基金项目:湖北省技术创新专项重大项目(cxzd2017000281),武汉理工大学研究生优秀学位论文培育项目(2017-YS-045),中央高校基本科研业务费(WUT2017-YB-023)资助项目 (1.武汉理工大学 现代汽车零部件技术湖北省重点实验室,武汉 430070； 2.武汉理工大学 汽车零部件技术湖北省协同创新中心,武汉 430070) |
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| 中文摘要: |
| 为了准确、高效地提取宽带激光熔覆熔池边缘, 排除宽带激光熔覆过程中存在的强烈弧光、金属液 滴、粉末飞溅等因素的干扰,通过CCD工业相机和复合滤光镜片组成的熔池监测系统实时采 集宽带激光熔 覆熔池图像。对获取的熔池图像进行预处理,选定阈值拟合二次曲线作为初始轮廓线,假设 目标区域与背 景区域具有最大的平均灰度差异,利用熔池本身几何结构信息与图像局部统计信息相互约束 驱动轮廓曲线 演化,准确地提取了宽带激光熔覆熔池边缘。与灰度阈值、数字形态学、C-V主动轮廓模 型等传统方法相 比,该方法有效地提高了熔池边缘提取的精度以及抗干扰性能。 |
| 英文摘要: |
| In order to extract weld pool edge in wide-band laser cladding accura tely and efficiently,and eliminate the interference such as strong arc,molten metal droplets and powder spatter,a m onitoring system composed of a charge-coupled device (CCD) camera and a composi te filter is used to gather the molten pool images directly during the laser cladding.The obtained molten pool image is preprocess ed,and the appropriate threshold is selected to fit a quadratic curve as the initial contour.Assuming that the t arget region and the background region have the maximum average grayscale difference,the geometric structure informati on of the molten pool and the local statistical information of the image are used to drive the contour evoluti on,ultimately,the pool edge in wide-bond laser cladding is extracted accurately.Compared with the traditional methods,such as gray threshold, digital morphology and Chan-Vese (C-V) active contour model,the experimental r esults show that the precision and anti-interference performance of the propose d method are improved. |
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