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1、第35卷第12期增刊仪器仪表学报Vol.35No.122014年12月ChineseJournalofScientificInstrumentDec.2014基于指针区域特征的仪表读数识别算法122312宋伟，张文杰，张家齐，王玉平，周庆，石为人（1.国网重庆市电力公司电力科学研究院重庆401123；2.重庆大学自动化学院重庆400044）摘要：针对目前指针式仪表读数识别算法易受光照影响，并且对较粗指针的仪表识别率不高的问题，本文提出一种基于指针区域的仪表读数识别算法。本文方法可分为两个阶段：第一阶段设计高斯型同态高通滤波器，增强仪表图像对光照变化的适应性
2、；并通过减影法、二值化、中值滤波、图像形态学处理等预处理方法减缓噪声、仪表非指针区域的干扰，突出仪表图像指针区域。第二阶段本文通过计算指针图像旋转不同角度后在纵轴投影，计算指针旋转至平行于横轴时旋转的角度；然后结合指针平行于横轴时在横轴上的投影得到指针夹角，最后通过指针夹角与仪表刻度对应关系识别仪表读数。本文算法简单稳定，得到的仪表读数与人工读数误差较小，同时能够较好适应光照变化。关键词：读数识别;同态高通滤波器;仪表指针区域;指针夹角Meterreadingrecognitionmethodviathepointerregionfeature122212
3、SongWei，ZhangWenjie,ZhangJiaqi,WangYuping,ZhouQing,ShiWeiren（1.StateGridCO.ElectricPowerResearchInstitute,Chongqing404100,China;2.SchoolofAutomation,ChongqingUniversity,Chongqing404100,China）Abstract：Readingrecognitionalgorithmsforpointertypemeterarevulnerabletoillumination,andrec
4、ognitionrateforthickerpointerisnothigh.Inthispaper,weproposeareadingrecognitionmethodbasedonpointerregion.Indetail,thisapproachcanbedividedintotwophases:inthefirstphase,theproposedmethoddesignsGaussianhomomorphichigh-passfiltertoenhancetheadaptabilitytotheilluminationchangeforinst
5、rumentimage,andutilizesimagepreprocessingmethods(includingimagesubtraction,binarization,medianfilter,imagemorphologyprocessingetal.)toreducenoiseinterference,suppressofbackgroundregion,outstandpointerregion.Inthesecondphase,thepresentedmethodfirstlyrotatesthemeterimage,andcomputes
6、projectionoftherotatedimageontheverticalaxisineachrotationangle,thencalculatestherotatedanglewhichrotatethepointerofmeterimagetoparalleltothehorizontalaxis.Whereafter,thedeflectionangleofpointercanbederivedforcombiningtheprojectionofrotatedimageonthehorizontalaxiswhichthepointerof
7、rotatedimageparallelstothehorizontalaxis.Finally,readingrecognitionisidentifiedbytherelationbetweenthepointerangleandthecorrespondinginstrumentsscale.Thisapproachissimpleandstable,theerrorbetweenthereadingoftheproposedapproachandartificialreadingissmall,anditcanbetteradapttoillumi
8、nationchanges.Keywords：readingrec
