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ID:33015610
大小:3.66 MB
页数:62页
时间:2019-02-19
《基于图像检测的双绞线绕距测量方法分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、宁波大学硕士学位论文Researchoftwisted-pairpitchmeasurementmethodbasedonimagedetectionAbstractWiththespeedofdatatransmissionimproving,internalcross-talknoiseofthetwisted-pairwillenhancesignificantly.Inordertokeephighdatatransmissionspeedofthetwisted-pairandmaintainint
2、ernalcross-talknoisewithinacontrollablescope,weneedtomeasurethepitchofthetwisted-pairaccurately.However,thetraditionalmethodsareinefficienttomeasurethepitchoftwisted-pair.Thetraditionalmethodsarelikelytoleadabigerrorbytheeffectofsubjectivevision.Toimproveth
3、eefficiencyoftwisted-pairpitchmeasurementandreduceartificialerrorsintheprocessofpitchmeasurement,thethesisputsforwardapitchmeasurementmethodbasedonimagedetection.Theproposedpitchmeasurementmethodsubstitutesmachinevisionforhumanvision.Itcanovercomethesubject
4、iveerrorofhumanvisioneffectively.AndthewholeprocessofmeasurementcanbecompletedindependentlybyindustrialPC.Itwillimprovetheefficiencyofpitchmeasurementeffectively.Inthethesis,themainachievementsareincludedasfollows:Firstly,thethesisoutlinesthewholeframeworko
5、ftwisted-pairpitchmeasurementsystemandtheeffectofeachmodulesinthesystem.Itexpoundsthepositionoftheparallellightsource,twisted-pairandCCDcamerainthemeasuredcavity.Inthecapturedimages,thedifferencebetweentheforegroundandthebackgroundismoreobviousbythisway.Fro
6、mtheaboveitisgoodforsubsequentimagesegmentation.Secondly,thegraydifferencebetweentheforegroundandthebackgroundisobviousinthecapturedimages.Toutilizethischaracteristic,animprovedtwo-dimensionalOtsualgorithmisproposed.Inthefirstplace,theimprovedalgorithmconst
7、itutesanewtwo-dimensionalhistogrambyanewlocaltemplate.Theimprovedalgorithmcanincludemorethan99.99%ofprobabilitydensitypointsbyusingtwoparallels.Thetwoparallelsareparalleltothemaindiagonal.Theoptimalscopeofnewtwo-dimensionalhistogramisabout30.63%ofthetraditi
8、onaltwo-dimensionalhistogram.Usingnewtwo-dimensionalhistogramwillreducetheoptimalscopeofalgorithmandacceleratethespeedofoptimization.Inordertoavoidtheproblemofrepetitivecomputationinthetraditionaltwo-d
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