焊缝缺陷类型识别方法的研究  

Recognition of Weld Defect Types

作　　者：申清明[1] 高建民[1] 李成[1] 

机构地区：[1]西安交通大学机械制造系统工程国家重点实验室,西安710049

出　　处：《西安交通大学学报》2010年第7期100-103,共4页Journal of Xi'an Jiaotong University

摘　　要：针对焊缝射线检测图像中缺陷类型识别准确度较低的问题,提出了一种基于直接多类支持向量机的缺陷类型识别方法.该方法将焊缝缺陷类型识别问题转化为一个约束优化问题,采用由缺陷边缘特征和区域特征构成的特征向量对缺陷进行描述,解决了在实际训练样本较少的情况下,提高缺陷类型识别准确度的问题.实验表明,该方法的识别准确度为94.25%,比一对一支持向量机和多层感知神经网络的高,并且通过引入区域特征提高了特征组的缺陷描述能力.To improve the recognition accuracy of weld defects in the radiographic image,a method based on direct multiclass support vector machine （SVM） is proposed to recognize the defect types,where the recognition of weld defects is regarded as a constrained optimization problem,and the edge-based features and region-based features of the weld defect are employed as the feature vector. This method solves the difficulty of achieving higher accuracy under a small training set. The experimental results demonstrate that the recognition accuracy of the method gets 94.25%,higher than that of the one-versus-one SVM and multi-layer perceptron （MLP） neural network,and the introduced region-based features improve the characterization capability of the feature group.

关 键 词：射线检测图像 缺陷类型识别 直接多类支持向量机 

分 类 号：TN911.7[电子电信—通信与信息系统]