基于动态焦点损失函数和样本平衡方法的绝缘子缺陷检测方法

In the task of insulator defect detection in aerial transmission lines,there are problems such as the sample numbers imbalance among different defect types and the inefficient learning of difficult samples,aiming at which,the dynamic focus loss function and the sample balance method based on second-order moments are proposed. Firstly,the attenuation factor of the focus loss function is dynamically solved accor-ding to the change of the difficult and simple samples distribution in the forward propagation. Then the discrete value of sample loss is used to locate the boundary of the difficult simple samples and obtain a difficult sample set. Finally,in the back propagation process,the contribution rate distribution of the learning samples is balanced according to the second-order moments of different sample losses. The experimental results show that the proposed multi-type insulator defect detection method can effectively learn the depth features of different samples,and its performance is significantly improved compared with other methods.