DIP_Lecture_11

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1、ShanghaiJiaoTongUniversityInstituteofImageCommunication&InformationProcessingSchoolofElectronicInformation&ElectricalEngineeringDept.ofElectronicEngineering2010ShanghaiJiaoTongUniversityInstituteofImageCommunication&InformationProcessingSchoolofElectronicInformation&E

2、lectricalEngineeringDept.ofElectronicEngineering2010DigitalImageProcessingEdgeDetectionLineDetectionRegion-BasedSegmentationMorphologicalFiltering2010DigitalImageProcessingEdgeDetectionLineDetectionRegion-BasedSegmentationMorphologicalFiltering2010DigitalImageProcessi

3、ngHoughTransform•Detectalineofspecifiedshape2010DigitalImageProcessing•Detectalineofunknowndirectionandpositionyuxv=+00yu=xv+vx=−+uyvx=−+uyii2010DigitalImageProcessing•Detectacircleofgivenradiusandunknowncenterposition222(x−a)+(y−b)=r222()()ax−+−=byr222(a−x)+(b−y)=rii

4、ybPiPiPjPbbj00PkPkaxaa002010DigitalImageProcessingStepsofHoughTransform①Findtherightparameterspace②ConstructandinitiateanaccumulatorarrayA(u,v)③Scanthebinaryimage.Foreach“1”inthebinaryimage,letA(u,v)+1④FindthemaximumvalueofA(u,v)2010DigitalImageProcessing2010DigitalIm

5、ageProcessingEdgeDetectionLineDetectionRegion-BasedSegmentationMorphologicalFiltering2010DigitalImageProcessing•Topartitionanimageintoregionsthataresimilaraccordingtoasetofpredefinedcriteria•Thresholding&RegionGrowing2010DigitalImageProcessingA.Thresholding⎧1,f(,)xy≥T

6、fxy(,)=⎨T⎩0,f(,)xy

7、icapproachistostartwithasetof“seed”pointsandfromthesegrowregionsbyappendingtoeachseedthoseneighboringpixelsthathavepropertiessimilartotheseed(suchasspecificrangesoftraylevelorcolor)•Selectingasetofoneormorestaringpointsoftencanbebasedonthenatureoftheproblem•Theselecti

8、onofsimilaritycriteriadependsnotonlyontheproblemunderconsideration,butalsoonthetypeofimagedataavailable2010DigitalImageProce