机械外文翻译文献翻译原型基于颜色的图像检索与MATLABWord文档格式.docx

机械外文翻译文献翻译原型基于颜色的图像检索与MATLABWord文档格式.docx

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Abstrac

Content-basedretrievalof（image）databaseshasbecomemorepopularthanbefore.Algorithmdevelop-mentforthispurposerequirestesting/simulationtools,buttherearenosuitablecommercialtoolsonthemarket.

Asimulationenvironmentforretrievingimagesfromdatabaseaccordinghistogramsimilaritiesispresentedinthispaper.Thisenvironmentallowstheuseofdifferentcolorspacesandnumbersofbins.ThealgorithmsareimplementedwithMATLAB.Eachcolorsystemhasitsownm-files.

Thephasesofthesoftwarebuildingprocessarepre-sentedfromsystemdesigntographicaluserinterface（GUI）.ThefunctionalityisdescribedwithsnapshotsofGUI.

1.Introduction

Nowadaystherearethousandsorhundredsofthousandsofdigitalimagesinanimagedatabase.Iftheuserwantstofindasuitableimageforhis/herpurposes,he/shehastogothroughthedatabaseuntilthecorrectimagehasbeenfoundoruseareferencebookorsome“intelligent”program.Videoondemand（VoD）servicesalsorequiresanintelligentsearchsystemforend-users.VoDsystems’searchmethodsdifferslightlyfromimagedatabase’smethods.

Areferencebookisasuitableoption,iftheimagesarearrangedwithausefulmethod,forexample:

1）categories:

animals,flags,etc,2）names（requiresagoodnamingtechnique）or3）dates.Anexperiencedusercanusethesesystemsaswellastextualsearches（keywordshavetobeinsertedinadatabase）efficiently.Therearesituationswhenamulti-languagesystemhastobeused.Therealanguageindependentsearchsystem’sbestpropertiescanbeutilized.Atoolwhichisbasedontheimages’propertiescanbemadelanguageindependent.Thesepropertiescanbeforexamplecolor,shape,texture,spatiallocationofshapeetc.

IntheMuVi-project[1]thiskindoftoolisunderconstruction.Itwillcoverthepropertiespresentedabove.Researchworkoncontent-basedimageretrievalhasbeendonein[2–6].Thesystem,whichispresentedinthispaper,isasimulationenvironment,whereMuVi’scolorcontentbasedretrievalhasbeendevelopedandtested.

2.Systemdevelopment

MATLABisanefficientprogramforvectorandmatrixdataprocessing.Itcontainsreadyfunctionsformatrixmanipulationsandimagevisualizationandallowsaprogramtohavemodularstructure.BecauseofthesefactsMATLABhasbeenchosenasprototypingsoftware.

2.1Systemdesign

Beforeanym-fileshavebeenwritten,thesystemdesignhasbeendone.AsystemdesignfortheHSV（hue,saturationandvalue）colorsystembasedretrievalprocessispresentedinFigure1.Similardesignhasbeendoneforallusedcolorsystems.

Figure1:

FunctionchartforHSVcolorspacewith27binshistogram.

Tesths27isthemainfunctionforthiscolorsystemandthisnumberofbins.Itcallsotherfunctions（hs27read,dif_hsvandimage_pos）whenneeded.Each

colorsystemhasamainfunctionofitsownandvariablenumber（2–3）ofsub-functions.Ifthereisnoneedforcolorspaceconversionthereare2functions,otherwise3functionsonthefirstbranchofthefunctionchart.

Thefunctioncallofthemainfunctionis:

matches=tesths27（imagen,directory,num）

Thevariableimagenspecifiesthequeryimage’snameandpath.Thedirectoryisapathoftheimagedatabaseandnumisadesirednumberofretrievedimages.

2.2Functions

Atthismomenttherearefunctionsimplementedforfourcolorspaces:

HSV,L*a*b*,RGBandXYZ[7].Eachcolorspacehasfrom2to4implementationsfordifferentnumbersofbins.Therearealtogether14mainfunctions.

Forsomecolorsystemsitispossibletomakethesefunctionsdynamic,i.e.dynamichistogramcalculation.Everycolorsystem/bincombinationrequiresitsownhistogramsandthesecanbemadeonlywithanexhaustivemethod（pixelbypixel）.Histogramcalculationtakes½

-5minutesperimage,each

approximately320×

240pixels,dependingonthecomplexityofthecolorspaceon150MHzPentium.Thusitisnotreasonabletolettheuserselectabinnumberfreely,especiallyinthecaseoflargedatabases.

Thefunctionshavebeennamedsothatthenamescontaininformationofthecolorspaceused,thepurposeofthefunctionsandthenumberofusedbins.Somefunctions,forexampleimage_pos,havebeenusedbymanyorallmainfunctionsandthesefunctionshavenotbeennamedasdescribedabove.

Themainfunctionchecks,ifthefunctioncalliscorrect.Ifthequeryimage’snamedoesn’tcontainapath,thefunctionassumesthattheimageissituatedinthedatabasedirectory.Inadditiontothis,themainfunctionchecks,ifthequeryimagealreadyhasahistograminthecurrentlyuseddatabase.Iftherequiredhistogramisnotthere,theimageread（forexamplehs27read）functioniscalled.Thisfunctionalsonormalizespixelvaluesandarrangesimagematrixdatatoavectorformat