电子信息类专业英语第7章・・.ppt

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1、UnitSevenImagesandTelevisionsPassageAFundamentalConceptsPassageBCompression/DecompressionTechniquesPassageCTelevisionPassageAFundamentalConceptsComputationalimageprocessingcanbedefinedastheoperationofmathematicalfunctionsonnumericrepresentationsofpictorialscenes.Ingeneralitispartofanoverallprocess

2、ofvisualperception,patternrecognitionandimageunderstanding.Theseformtheessentialcomponentsofcomputervision.Fortunatelyimageprocessingisconceptuallyrathersimplerthanmanyofthecognitiveprocessesassociatedwithcomputervisionandhasbeenthesubjectofrathermorepracticalandsuccessfuleffort.Whilstitmaybeofsci

3、entificinteresttoexploitmathematicsinthepursuitofperception,theobjectivebasisofimageprocessingistoapplyanalgorithmtoarepresentation(usuallydigital)ofavisualscenetoproducefollowingresults.[1]·Understandingthroughquantitation.·Perceptionthroughanimprovementinachosenindexofquality.·Efficiencythroughi

4、mprovedimagecoding.ImageAnalysisThegoalsofimageanalysiscantakeavarietyofforms:·Acompletesymbolicdescriptionofanimageatanadequatelevelofabstraction.·Alistofinterestingevents,orobjects,occurringwithintheimage.·  Adescriptionofchangeswhichhaveoccurredbetweensuccessiverecordingsofanimage.Thefirstofthe

5、sedefinitionsallowsussomeflexibilityinthechosenlevelofabstraction.Inimageprocessingwewillnormallybeoperatingatthelowestlevel,whichnamesregions,pixelsorlinesandattributescharacteristics.Athigherlevelswebegintobringinknowledgeoftheimageddomain.Thegeneralstructureoftheoverallimagingsystemcanbesimplif

6、iedasinFigure7.1.Figure7.1AgeneralmodelofimageanalysisAsystemforpatternanalysisandunderstandingmayrequireuptosevenbasiccomponents.·Adatabasewhichcontainstheoutcomesofcaptureorprocessing.·Amodulecontainingalgorithmsandprotocolsofprocessing.·Amodulecontainingknowledgeaboutthetaskdomainandthecandidat

7、enatureoftheimage.·Amodulecontainingconceptsofcontrolandstrategiesofprocessing.·Alearningmodulewhichenhancesknowledgeinthetaskdomainbyanalyzingtheeffectivenessofcurrentprocessingstrategies.·Amodulewhichexplainsac