基于加权红-黑小波变换的dr图像增强方法研究

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1、万方数据硕士学位论文basedonhybridoptimizationalgorithmandSOon．Thesemethodscanenhancethecontrastoftheimageandimagedetailstosomeextent，buttherearesomeshortcomings，suchastheintroductionofhaloartifactsattheedges，amplifyingnoise，fuzzydetailsandslowspeedandothershortcomings．Anenhancemen

2、talgorithmbasedonweightedred·blackwavelets(WRB)transformispresentedfortheoriginalDRimageswitlltheproblemsofdetailsburiedandwidedynamicrange．Withthepropertyofmulti-resolutionanalysis，classicalwavelettransformCandecomposeanimagetothevarioussub-bands，duetoitssub—bandtransfo

3、rmcoefficientshavegoodmaneuverability，andclassicalhasalong-termdevelopmentinthefieldofimageenhancement．However，sameastheFouriertransform，classicalwavelettransformbelongtothefrequencydomainanalysis，thoughithastherapidcalculationmethod，itstillhastheweaknessoflargeamountofc

4、alculation，largememo巧space，floatingpointcalculationsandSOon．Secondgenerationwavelettransform(alsocalledliRingwavelettransform)，comparedtothefirstgenerationwavelettransform，nolongerdependentontheFouriertransform，butinheritsthefirstgenerationwavelet’Scharacteristicsofmulti

5、-resolutionanalysis，itusein-situoperations，hasfastcomputingspeedandwithouttakingupadditionalstoragespace，andthereisnorestrictiononthesizeoftheimage．Onthisbasis，GeertUytterhoevenproposedanon-separablewavelet-red-blackWavelet(red·blackwavelet，RBW)basedontwo·dimensionallift

6、ingscheme．Thewavelethastwofullstepsofthehorizontal／verticalanddiagonallifting；eachliftingwavelettransformiscomposedbythreestepsofsplit，predictandupdate．Inthisthesis，weproposedanewweightedred-blackwavelettransformbasedonclassicalred-blackwavelet，andapplyittotheDRimageenha

7、ncement．Classicalred．blackWaveletTransformselectthelinearpredictionoperatorandupdateoperator，butmostoftheimageshavenon-contiguousareas(suchasedges)，the万方数据ABSTRACTpixelvalues’differenceisbigneartheedge，usinglinearinterpolationformulacannotgetagoodpredictionandupdate，wesh

8、ouldchoosethepredictionoperatorandupdateoperatorbasedonthelocalfeaturesofimages，SOthatthepredictionoper