基于图像检测的双绞线绕距测量方法分析

《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