水平未知时一种图像恢复正则化算法(图像和数字(3)

发布时间:2021-06-06

壁曼壅王墨塾壁=塑璺堡堡墨垂型垡基鎏

Aregularizationmethodforimagerestorationwithoutknowingnoise

level

ABS’I’RACT

Imagerestorationisoneofthebasicproblemsindigitalimage

processing.Inrecentyears,thetechnologyiswidelyappliedinmang

fields,suchasradioastronomy,sateliteremotesensing,medicalimag-

ingandindustyvision.Theusualmethodsincluderegularization

method,iterativemethod,stochasticmethodandSOon.

Inthisthesis.animprovedcombiningregularizationframework

oftwoparameterstype,proposedbyR.YoumaranandA.Adler,is

presentedanddiscussedforstableimagerestorationwithoutknowing

noiseleveloftheinputdata.Somedetailsoftheimprovementsin—

cludetheadoptionofwell—-knownL-curvecriterionwith

techniqueforaaspeed uproughinitialvalueofregularizationparameter,the

translationofEulerequationrequiringverylargeamoutofstorage

toanequationrequiringmuchlessmemory,therelatedanalysisand

proof,thedesignofthenewalgorithmandSOon.

Thetheoreticanalysisandnumericalexperimentsresultshave

shownthatournewalgorithmhasfastconvergencespeedandgood

arerestorationeffect,andvaluesofISNRimprovedupon0.3dbgen—

onerally.We

inachieveallthenumericalexpermentstogiveapersenalcomputerMatlablanguageandwishhandonthisworks.

KEYWORDS:imagerestoration,regularizationmethod,L—curve

criterion,choosingregularizationparmeter,frameworkoftwoparam—

eterstype

Il

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