儀表表盤參數(shù)符號識別技術(shù)研究.pdf

1、廣東工業(yè)大學(xué)博士學(xué)位論文儀表表盤參數(shù)符號識別技術(shù)研究姓名：張艷玲申請學(xué)位級別：博士專業(yè)：控制理論與控制工程指導(dǎo)教師：汪仁煌20080501PhDThesisofGuangdongUniversityofTechnologyvAbstractTherecognitionofmeterparametersymbolsistorecognizeallthesymbolsonthedialplateexcepttheareasofdialpoi

2、nterandscalesThesemeterparametersarescatteredinanypositionofdialplateexcepttheareasofdialpointerandscalesTheyarenotfixedandarrangedorderlylikeautomobileregistrationnumbersandIDcardnumbersTherearevariouskindsofparameterso

3、nthedialplate：accuracygrade，metername，metertype，unit，measurementrange，gradeofdefendingthemagneticfield，standardsignalscope，producedate，factoryserialnumberetccontentsTheirpositionsarenotregularonthedialplateSomemeterparam

4、etersymbolsarespecialsignsSothecurrentOCRsoftwareCan’tidentifythemThisthesisistesearchthesegmentationandrecognitionofmeterparametersymbolsThesemeterparameterssymbolshavetoberecognizedanddefinedatthetimeofmeasuringinorder

5、tealizethereading，calibration，andmanagementofmetersautomaticallyThemainresearchresultsandinnovativepointsofthisthesisareasfollows：1AnalgorithmispresentedtoenhancethecontrastofmeterimagebasedonsinglescaleRetinexandbilater

6、alfilterThisalgorithmstrengthenstheinformationhiddeninthelargescaleshadowofmeterimageefficiently2Twoilluminationcorrectionmethodsbasedonthesimulationofthebackgroundoftheimageareputforward：piecesamplingandreformedTophattr

7、ansformation3AnewschemeoflocatingdialplateparametersareaindirectlyisputforwardThisdesignincludestwokindsofmethodsOneistodetectanddeletethearcrangeusingthecombinedalgorithmoftrackingedgeandfanshapedSCan，Anotheristochooset

8、heparamrtersareabasedondialinformationandtextureanalysis4Basedonthecombinedfeaturesofcharacterssuchasconnectivitycharactercentraldistance，symmetryetc，themeteraccuracygradeandparametersymbolsaresegmentedefficiently5Basedo

9、nthecombinedfeaturesofHumoment&compactnessandsupportvectormachine，themeteraccuracygradeandparametersymbolsarerecognized，thealgorithmofthispaperimprovesrecognitionrateofmeterparameterssymbolsefficientlyItlaysthefoundation

10、forrealizingthereadingcalibration，andmanagementofmetersautomaticallyKeywords：dialplateparametersymbols；singlescaleRetinex；bilateralfilter；fan—shapedSCan；detectthearcrange；phasessegment；Humoment&compactness；supportvectorm