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ID:32146899
大小:9.88 MB
页数:41页
时间:2019-01-31
《基于非采样contourlet变换和图论的医学图像侵害》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、山东大学硕士学位论文ABSTRACTImagesegmentationistheimportantpartinimageprocessingtechnology.Withthedevelopmentoftheinformationtechnology,Medicalimagesegmentationplaysamoreandmoreimportantroleinmedicalapplications.Medicalimagealgorithmefficiencyhasimportanttheoreticalresearchmeaningandcommercialva
2、lue.Inmedicalimages,thereoftenwillbeunnecessarynoisedistributioninfocalregion;thiswillincreasethedifficultyofthedoctortoaccuratelydiagnosisthedisease.Whenthemedicalimageusingageneralsegmentationmethodtosegmentmedicalimage,usuallyneedtodenoisetheimagefirstly,butthedenoiseprogresswillmak
3、ethesegmentationprocesstimelonger,thisrestricttheapplicationofmedicalimagesegmentationtechnology.Fortheabovephenomenon,thispaperproposesthemedicalimagesegmentationbasedonnon—subsampledContourlettransform(NSCT)andgraphtheory.Firstly,usenon—subsampledContourlettransformtheimage,gettheCon
4、tourletcoefficientofmultiscaleanddirectionalinformation.Non—subsampledContourlettransformisdecomposedfastalgorithmofimagewiththedirectionandwiththeshiftinvariance.Imagesegmentationbasedongraphtheoryisahottopicthisyear,becausethegraphtheoryisamaturetheoryinresearchandapplicationrelative
5、ly,thispapermainlyintroducestwokindsofsegmentationmethodbasedonGraphTheory:normalizedcutsegmentationandisoperimetricsegmentationmethod,becausethecuttingmethodbasedonGraphTheoryisgenerallyalargeamountofcalculation,andaffectedbynoise,SObeforethesegmentation,weusingNon-subsampledContourle
6、ttransformextractthelow-frequencyinformationoftheimage,researchshowsthat,thelowfrequencycoefficientsretainthemostoftheinformationintheimage,theunnecessarynoiseisfiltering,anditreducestheredundantinformationinimage.Sointheflowingsegmentationprocess,wecansavealotoftime,andgetagoodsegment
7、ationresults.Theproposedalgorithmisverifiedinthespecialtyofmedicalimage.The山东大学硕士学位论文experimentalresultsshowthat,theproposedalgorithmobtainedgoodresultsandgreatlyshortentheprocessingtime,whichhasanimportantsignificanceinpracticalapplication.Theexperimentalresultsshowthat,therecogniti
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