Yao, N.; Wu, X., and Cai, Y., 2018. Identification of corrosion degree for grounded screen of extra high voltage transmission line in coastal area based on infrared thermal image. In: Liu, Z.L. and Mi, C. (eds.), Advances in Sustainable Port and Ocean Engineering. Journal of Coastal Research, Special Issue No. 83, pp. 124–128. Coconut Creek (Florida), ISSN 0749-0208.
In the traditional recognition methods of corrosion degree of grounding grid of extreme high voltage transmission line, the noise in the infrared thermal images causes the inaccurate corrosion position and the large recognition error. Therefore, the recognition method of corrosion degree based on the infrared thermal image was proposed. Through the color histogram method, the color coherence vector method and the color correlogram method, the extraction of corrosion area characteristics in grounding grid image of extreme high voltage transmission line was realized. On this basis, HSI color space conversion was used to obtain the infrared image edge information. The median filter was used to preserve the advantage of edge information. The gradient method was used to extract the highest temperature area, realizing the identification of corrosion area of grounding grid of extreme high voltage transmission line. Experimental results show that the proposed method can accurately locate the corrosion area. It has the high recognition accuracy.