**5. Conclusions**

The image processing technology is used to process the icing image of the insulator, extract the characteristics of the icing degree of the iced insulator, and analyze the icing characteristics of the insulator. The proposed method will be helpful to the monitoring of the icing degree of the iced insulator. The main conclusions are as follows


**Author Contributions:** Y.L., Q.L. conceived and designed the study. Y.L., Q.L. analyzed the results. Q.L. drafted this article. M.F., and B.X.D. made the critical and final reviewing. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by Chinese National Natural Science Foundation gran<sup>t</sup> number 51277131, National Basic Research Program of China gran<sup>t</sup> number2014CB239501 and 2014CB239506, and Natural Science Foundation of Tianjin gran<sup>t</sup> number 16JCQNJC06800.

**Conflicts of Interest:** The authors declare no conflict of interest.
