資源描述：
《基于非采樣contourlet變換和圖論的醫(yī)學(xué)圖像侵害》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、山東大學(xué)碩士學(xué)位論文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山東大學(xué)碩士學(xué)位論文experimentalresultsshowthat，theproposedalgorithmobtainedgoodresultsandgreatlyshortentheprocessingtime，whichhasanimportantsignificanceinpracticalapplication．Theexperimentalresultsshowthat，therecogniti
