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1、ComputerEngineeringandApplications计算机工程与应用2016，52（23）213面向自动校验系统的指针式压力表读数识别1231李祖贺，刘嘉，薛冰，王凤琴1231LIZuhe,LIUJia,XUEBing,WANGFengqin1.郑州轻工业学院计算机与通信工程学院，郑州4500022.郑州轻工业学院软件学院，郑州4500023.河南省日立信股份有限公司，郑州4500011.SchoolofComputerandCommunicationEngineering,ZhengzhouUniversi
2、tyofLightIndustry,Zhengzhou450002,China2.SchoolofSoftwareEngineering,ZhengzhouUniversityofLightIndustry,Zhengzhou450002,China3.HenanRelationsCo.,Ltd.,Zhengzhou450001,ChinaLIZuhe,LIUJia,XUEBing,etal.Automaticcalibrationsystemorientedreadingrecognitionforpressuregaug
3、eswithpointers.ComputerEngineeringandApplications,2016,52（23）：213-219.Abstract：Formachinevisionbasedcalibrationsystemsofpressuregaugeswithpointers,aschemebasedontheframedifferencemethodandtheanglemethodispresentedforautomaticreadingrecognitionofindexinstruments.Ame
4、thodthatusestheextremepointsindetectedregionstodeterminethecentroidsofpointersisalsoproposedtosolvetheproblemofcentroiddeviationforincompletelydetectedpointers.First,thecenterofthedialplateisdeterminedandtheregionofthedialplateissegmentedusingHoughcircledetection.T
5、henthepointerregionisdetectedusingthethree-frame-differencemethod.Thepointercentroidislocatedbyselectingthetwopointsclosesttothediagonalvertexesoftheminimumrectan-gleenclosingthepointerregionfromtheextremepointsineightdirections.Finally,thedeflectionangleofthepoint
6、eriscomputedandthepointerreadingisrecognizedviaconnectingthepointercentroidandthecenterofthedialplate.Experi-mentalresultsrevealthattheregionalextremepointsbasedpointercentroidlocationcansimplyandeffectivelycorrectthecentroiddeviationforincompletelydetectedpointers
7、.Theoverallschemecanaccuratelyrecognizethereadingsofpressuregaugeswithpointers.Keywords：pointerinstrument;readingrecognition;framedifference;centroidextraction摘要：针对基于机器视觉的指针式压力表校验系统，给出了一种采用帧差分法和角度法自动识别指针仪表读数的方案，并且为了解决残缺指针区域的质心偏移问题提出了一种利用区域极值点确定指针质心的方法。首先基于霍夫圆检测进行表盘
8、中心定位和表盘分割；然后采用三帧差分法检测指针区域，并从其八方向极值点中选择最接近指针区域最小外接矩形对角顶点的两点来定位指针质心；最后连接指针质心和表盘中心以计算指针偏转角度和识别读数。实验结果表明基于区域极值点的指针质心定位可以简单有效地修正残缺指针区域质心偏移，整体方案能够较准确地识
