绝缘子串红外图像中单个绝缘子盘面的提取方法  

The Method to Extract Shed Surface Image of a Single Insulator From Infrared Image of a Insulator String

作　　者：陈芳[1] 姚建刚[1] 李佐胜[1] 李文杰[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南省长沙市410082

出　　处：《电网技术》2010年第5期220-224,共5页Power System Technology

基　　金：国网电力科学研究院科研基金项目;长沙市科技计划项目的支持

摘　　要：应用组合方法分割绝缘子串红外图像,首先采用改进的一维直方图灰度拉伸法增强绝缘子红外图像;然后用Otsu法对图像进行阈值分割;图像二值化后,采用形态学开启、闭合操作对图像进行去噪;再用梯度法提取图像边缘。绝缘子串中单个绝缘子盘面灰度没有明显差别,故采用最小二乘法拟合单个绝缘子盘面边缘;同时绝缘子串中各个绝缘子盘面遮挡部分不同,故对串中各个绝缘子未被遮挡的半盘面图像进行了提取。To extract infrared image of a single insulator shed surface from that of an insulator string, a combined cutting method is proposed and applied. Firstly, the infrared image of insulator string is enhanced by improved gray level stretching of unidimensional histogram; then the variance based Otsu method is adopted to perform the threshold segmentation of the image of insulator string; after the binarization of the whole image, the morphological open- and close-operation are carried out to denoise the whole image; and then the edge of the whole image is extracted by gradient method. Because there is no evident difference of gray level in the image of single insulator shed surface, so the least square method is used to fit the edge of shed surface of single insulator; for the shielded parts of insulators＇ shed surfaces in the string are diverse from each other, the infrared images of unshielded half shed surfaces of all insulators in the string are extracted.

关 键 词：绝缘子 阈值 一维直方图 图像二值化 形态学 最小二乘法 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构] TM85[自动化与计算机技术—计算机科学与技术]