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1、杭州电子科技大学硕士学位论文ABSTRACTThePrintedCircuitBoard(PrintedCircuitBoard,PCB)defectdetectionbasedonmachinevisionistheingretationtechnologyofimageacquisition,imagetransmissionandimageprocessing,itisthefuturedevelopmenttrendofnon-contactdefectdetectiontechnologya
2、ndhasmanyadvantages,suchashighintelligentlevel,defectdetectioncoverageanderrordetectionrate.PrintedCircuitBoardisthebasicmaterialofelectroniccommunicationproducts,whosequalityaffectstheoverallqualityoftheelectroniccommunicationsproductsandsystemstabilit
3、y.Therefore,thedefectdetectionmethodcarriedoutonthePCBiscriticaltoimprovethequalityoftheproducts.Becauseofitshighintelligentlevel,defectdetectioncoverageanderrordetectionrate,ithasbeenwidelyusedindefectinspectionofPCB.ThisprojectcooperateswithZhejiangOV
4、ITechnology,designingandproducingtheembeddedFPGAhardwaremoduleandtakingtheadvantageofparallelcomputingandassemblylineprocessingofFPGAprocessortosolvethecomplexlogicoperations.Itusesuppermachinetoimplementpartoftheimageprocessingalgorithm,thusimprovingth
5、edefectsdetectionspeedandrecognitionaccuracyofPCB-AOIproducts,whichhastheverygoodpracticalvalue.Themaincontentsofthispaperareasfollows:1)ItdesignsthePCBimagetransmissioncollectionandprocessingsystem,includingtheimageacquisitionmodulebasedonCameraLinkint
6、erface,theFPGAimageprocessingmoduleandthepixelcoordinatesdatatransmissionmodulebasedonEthernetMAC(MediaAccessControl)protocollayer.2)ItproposesusingVeriloghardwaredescriptionlanguagetoimplementthealgorithmofcontrastenhancementbasedongammatransformationo
7、fcopperandnon-copperareainPCBimageontheFPGAimageprocessingmodule,italsoeliminatesthenoiseofmedianfilteringalgorithmandpreprocessesthescannedPCBimages.3)Thispaperfocusesonthedesignandimplementationoftheimagesegmentationalgorithmsbasedondoublethreshold,gr
8、adientthresholdandgaussLaplacetransformation,segmentsthecopperandnon-copperregioninPCBimageII万方数据杭州电子科技大学硕士学位论文andextractsthesubpixelcoordinatesofthebinaryimageaftersegmentation.Thispaperachievesthereal-timeimageprocessingonthePC
