复合绝缘子接触角的图像处理检测

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1、第13卷第2期电机与控制学报Vol113No122009年3月ELECTRICMACHINESANDCONTROLMar.2009复合绝缘子接触角的图像处理检测1,31,231陶维亮,王先培,刘艳,王泉德(1.武汉大学系统集成与故障诊断实验室,湖北武汉430079;2.襄樊学院计算机教学中心,湖北襄樊441053;3.武汉大学电子信息学院,湖北武汉430079)摘要:提出了利用数字图像处理技术和曲线拟合理论自动检测复合绝缘子表面接触角的方法。针对绝缘子表面水珠图像的特点,首先利用中值滤波、灰度拉伸等算法预处理图像,去

2、除高频噪声,并从背景中突出水珠轮廓;然后利用Robert算子边缘检测、迭代最优阈值区域分割等算法将水珠与背景分离;再采用骨架提取迭代和八邻域轮廓跟踪等算法提取水珠的边界曲线;最后以正交多项式为基函数拟合水珠边界曲线,继而求导得到接触角。该方法能够现场检测运行中的绝缘子,测量过程不需人工干预,客观精确。多次测量同一复合绝缘子的接触角,均方误差在2%之内。关键词:绝缘子;憎水性;接触角;图像处理中图分类号:TM216文献标识码:A文章编号:1007-449X(2009)02-0232-06Measurementoncom

3、positeinsulators’contactanglesbasedonimageprocessing1,31,231TAOWei2liang,WANGXian2pei,LIUYan,WANGQuan2de(1.LaboratoryofSystemIntegratedandFaultsDiagnostics,WuhanUniversity,Wuhan430079,China;2.ComputerTeachingCenter,XiangfanUniversity,Xiangfan441053,China;3.Scho

4、olofElectronicInformation,WuhanUniversity,Wuhan430079,China)Abstract:Amethodtoauto2detectcontactanglesofwaterdroponthesurfaceofacompositeinsulatorwithimageprocessingandcurvefittingisproposedinthispaper.Firstly,accordingtotheimagecharacteristicsofwaterdroponinsu

5、lator’ssurface,themedianfilteralgorithmandthegraystretchalgorithmwerede2ployedtosuppressnoiseandhighlighttheoutlineofwaterdropfrombackground.Secondly,inordertoseparatewaterdropfrombackground,theprocessofimagesegmentationwasimplementedusingtheedgedetectingalgori

6、thmofRobertandtheiterativeregionpartitionalgorithmonoptimizedthreshold.Then,theproposedmethodcombinedsketchextractioniterationalgorithmandeightneighborhoodoutlinetrackingal2gorithmtoextractthecorrespondingboundarycurveofwaterdrop.Finally,thepolynomialfittingwas

7、de2ployedtofittheboundarycurveofwaterdrop,andcontactangleswerecalculatedbydifferentiatethepoly2nomialdeducedfromthepolynomialfitting.Theproposedmethodcoulddetectcompositeinsulatorinoper2ation.Moreover,thedetectioncouldbeprocessedwithoutmanualinterventionwhichma

8、kesthedetectre2sultaccurateandobjective.Experimentsshowthat,implementingtheproposeddetectionofcontactanglestothesamecompositeinsulatormanytimes,therootmeansquareerrorisbelow