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AnImage-basedVirtualPresentationandAidedDesignSystemforTextileProductsWenLi,Ming-minZhang,Zhi-gengPan,PengWangStateKeyLabofCAD&CG,ZhejiangUniversity,Hangzhou,310027,China{liwen,zmm,zgpan,wangpeng}@cad.
zju.
edu.
cnAbstractVirtualpresentationanddesigntechniqueshavefoundalotofapplicationsintextileindustryinrecentyears.
Howtoachieverealisticeffectsinexhibitionandprovideasetofconvenientdesignmethodsisstillagreatchallenge.
Inthispaper,wedesignandimplementanimage-basedpresentationanddesignsystem(namedEasyshow).
Veryrealisticeffectsareachievedbyusingnoveltexturemappingandcolorblendingalgorithms.
Wealsoprovidepowerfulmanagementfunctionsandvariousdesigntools.
Inaddition,asitisanimage-basedsystem,itcanbemigratedtointernetandmobiledeviceseasily.
1.
INTRODUCTIONVirtualreality(VR)isanewandattractivehuman-computerinteractivetechnology,whichhasbecomeoneofthefocusesofresearchanddevelopmentincomputerfieldstoday.
FamousVRexpertsShermanandJudkinsdescribedthecharacteristicsofVRasfive-I:intensive,interactive,immersive,illustrativeandintuitive[4].
Therefore,VRisgreatlysuitableforusingintheapplicationofvirtualpresentationandaideddesign[6].
Ageneraldefinitionofproductvirtualpresentationis:aspecialcomputersystemisdesignedtosimulateorreplacetheexperiencesindealing,accordingtothepropertyofproduct,thetraitoftrade,andthefavorofcustomers.
Theusualformsareonlineshopping,onlineauction,virtualmall,onlinetry-onandsoon[11].
Generallyspeaking,therearetwokindsofproductvirtualpresentationways:2Dimagebasedpresentationand3Dmodelbasedpresentation[3].
A3Dmodelcanoffervaryingdegreesofviewing,enablesconsumerstointeractwiththeirproductsratherthanjustlookatthem,butstillencountersmanyunconquerableproblems[5]:Withthecurrentlimitedtransmissionbandwidth,buildingvirtualenvironmentsforInternetalwaysmeanstoreducegeometryandthenumberofelementsshown;Thesenseofimmersionisreducedbecauseofusingtraditional2Ddevices;Thesoftwareneededfor3Disusuallynon-standard,crash-prone,andrequiresanextradownload.
Today,theapplicationof2DimagebasedmethodinE-commerceisstillcommon.
Thereasonsarealsoobvious:Averagely,thepurchasingspeedunder2Denvironmentis140%fasterthanthatunder3Denvironment,becauseofsavedsearchingtime;Customersaremoreaccustomedtocontrola2Dobjectwiththeinteracitvetechniquesthatarecurrentlyincommonuse;Costisanimportantfactorasitisrelativelycheapertoconvertaproduct'sfiguretopicturesthantomodels.
Theuniquetextureandcoloraretheidentificationsofeachcloth.
Wewanttopreservetheprimalinformationaftercomputerprocessingasmuchaspossible.
Imagesoftheoriginalproductareobviouslybetterthanthemodelstothisduty.
Everyclothhasverycomplicatedexpressivedetails,suchasmillionsofmicrostructuresinwoof,floss,andwrinkle.
It'sstillverydifficultinresearchtorealize3Dsynthesizedcloth[7].
Wegettheconclusionthat2Dimagebasedmethodistheoptimalchoiceforthevisualpresentationoftextileproducts.
Notonlyfortheguaranteeofmoreabundantandconvenientinputsources,moreaccuratelyinpreservingthetruenessoftextureandcolor,butalsoforthebestuseoftheexistingimage-basedgraphicsprocessingalgorithms.
Itwillachieveamoreefficientrunningstatethan3Dmethodwiththereducedcomputercomplexityandreservingspace.
2.
RELATEDWORK2.
1.
RelatedSystemsHerewesimplyintroducesomerelatedvirtualpresentationandaideddesignsystemsdevelopedbydomesticorforeigncompaniesorresearchinstitutes.
VisionEasyMap[10]isaverysuccessfultexture-mappingprogramdevelopedbypredominantNedGraphicscompany.
VisionEasyMapCreator,VisionEasyMapViewer,andtheVisionEasyMapSDKmakeupasoftwaresuitethatallowsyoutorealisticallyvisualizedifferentcolor,fabric,andothersurfacesonphotographsofyourproduct.
Today,thetechnologyhasbeenmigratedtothewebasthee-merchandisingcomponentofB2BandB2Cwebsites.
KaledoStyle[9],aprofessionalfashiondesignerorientedsoftwarereleasedbyfamousLectracompany.
Itpreferstotheinspirationandideascomeupwiththedesigningoffiguresandcolors.
Itsprocessinginputsaresomesystembuilt-incartoonfiguresorclassicdesigntemplatesinsteadofrealphotographs.
TheDesignandPracticeforStripTextile[12]isaprototypedevelopedbyChinaTextileAcademyrecently.
Itconsistsofmorethanonethousanddesignexamples.
Goodharmonybetweencolormatchesandinnovativeideologyfordesignprocedurearethehighlightsofthissystem.
On-linegarmentexhibitionsystem[13]developedbyHangzhouSaihuNetworkTechnologiesCo.
Ltd.
isa3Donlinetry-onsystem.
Ithaspowerfulinteractivefunctions,canmakevariousfigures,cloth,andstylesreplacementsforgarmentmodels.
Itisespeciallyfitfortheexhibitionofnewpatternsindresscompanies.
2.
2.
DiscussTherearesomedeficienciesorshortagesintheexistingsystems:Thefocusesofthesesystemsincludeprofessionalindustry,fashiondesign,aestheticsandentertainment,butbusinessdealinghasnotbeencoveredyet!
Lackofflexibilitiesinmosttime.
Theregionsthatcanbereplacedintheprimitiveimagearemostlypredefined.
Thesamplesinthedatabasecan'tbeimportedorexportedaswill,beshortofuniversality.
Thetexturemappingorcolorblendingalgorithmshavesomedefects[2].
EspeciallyforHangzhouSaihu's,we'llfindobvioustexturedistortionswhenmappingcrossbandpatterns.
Highlightspotandshadowinformationwillgetlostindarkcolorcloth.
Soweascertainoursystemdesignprincipleandimplementaimjustagainsttheanalysesabove.
Realisticexpressiveeffects.
Wemakegreateffortstopreservetheimage'sappearancejustlikeafternaturalreplacementinreallife.
Thenewtextureextensiondirectionswillbeconsistentwithprimitiveones.
Thealgorithmsadoptedinoursystemareespeciallysuitablefortextileproductssuchasgarment,beddings,sofas,pillow,andtablecloth.
Providediverseinteractivewaysforusersandgivethemmoreopportunitiestocustomizeoralternatethevisualizationmanners[1].
Forexample,youcanselectautomodeormanualmodeonyourownaccordwhendeterminingtheboundariesofreplacementregion.
Powerfulmanagementcapabilities.
Sinceoursystemisbusinessoriented,besidesthesimplepresentationfunctions,weshouldmakeeffectivemanagementforagreatamountofbasemodelsandclothtextileimages.
3.
ARCHITECTUREEasyshowisatypicalsystemdevelopedunderwin32environment,withdatabasesupportinbackend,andimagesprocessingandrenderingworksinfront.
Ingeneral,therearefourcomponentsinthesystem.
Databaseaccesssub-componentisresponsibleformodelbaseimagesandtextileclothimages'loadingandsaving,andtheusers'privateaccountinformationaccess;Imageprocessingsub-componentisthekernelpart,theentiresystem'sexpressiveeffectandrunningefficiencyareaffectedbyit.
Thesoulofitistwoadaptedtexturemappingandcolorblendingalgorithms[8];Aideddesignsub-componentcomprisesVisualStampfacility,PiecePasteutility,andregionortextureborders'parametersadjustingtools.
Theyareindispensableaidedtoolswhenyouwanttoenhancetheexhibitioneffectsorimprovetheflexibilityincomparisons.
Securitysub-componentisabasicpartofeverymoderncommercialsoftware,they'reencryption,registration,authorization,rightscontroletc.
.
Fourmodulesareorganicallyunifiedbythesystematicmaininterface,thecorrespondingseriesofdialogboxesanddataexchangebetweenthetoolbars.
Thesystemusemainlymouseoperations(cooperatingwithkeyboardincidentally).
Theoverallsystemmoduleconstitutionanditsrelationshipsmayexpresswiththefollowingstructuredrawing(figure1):Aideddesignsub-componentSecuritysub-componentFigure1:Easyshowsystemstructuredrawing.
4.
IMPLEMENTATIONApplyingthetechnologiesthearticleproposedbefore,wehavealreadysuccessfullydevelopedanewtextileeffectvirtualdemonstrationsystem,mainlyusedfordemonstratingdifferentvisualeffectstocustomerswhenthewindowblinds'colorsandtexturearechanged(systemoverallinterfacelikefigure2).
UnderourcooperationwithShanghaiJiashuaiScienceandTechnologyLimitedCompany,thissystemhasbeensuccessfullypushedtothemarket,andgainedgoodresponse.
Figure2:OverallinterfaceofEasyshowThedevelopmentenvironmentandprogramtechnologiesappliedinoursystemincludewindowsXPOS,VisualC++6.
0IDE,OpenGLSDKandADOdatabaseengine.
Thesystemisdesignedintotwoeditions:self-runningeditionandnetwork-running(LAN)edition,whichprovideitwithbroaderusingsituationandstrongermarketcompetitivepower.
Consideredtosystembackstagedatabasescaleisnotbig(thenumberofmodelsandtextilesisabout100-300,notexceeding500generally),wedirectlyselectMicrosoftACCESS2000(theMDBdocument)asthedataformat.
ThenetworkversionchooseMSSQL2000server,guaranteeingthedataconsistenceandsafetywhenmulti-usersaccessatthesametime.
Acompletedemonstrationandtransactionprocesscanbeexpressedwiththefollowingsteps:Step1.
Loadmodelsimagecomefromdatabaseoroutsidefile;Step2.
Preprocess,resizing,contrastadjustment,withVirtualStamppossibly;Step3.
Specifyreplacementregions.
Ifnotsavedbefore,drawnewborders,manuallyorautodetected;Step4.
Parameterizetexturedirectionsinsub-areas.
Texturecoordinatesarecalculated,adjusted,andsmoothedautomatically;Step5.
Selecttextureandreplace.
Ifyouwanttoobservetheeffectswithothertexture,repeatthisstep,ifdissatisfied,backtostep4;Step6.
Post-process,withpiecepastepossibly.
Ifsatisfied,saveorprint,andexitthesystem.
Ifcontinuewithotherexhibition,backtostep1.
Clothtexturesandblindmodelscanbemanagedbyclothmanagementormodelmanagementsub-modulerespectively.
Includingthesettingandmodifyingofrelativeattributes,importingoutsideimagefiles,addingorremovingspecifieditems,printingorsavingcurrenteffects.
Theusersonlyneedtoselecttheirfavoritemodel,followingaseriesofstepslikedrawingborderlinesandsoon,thendraganddropfondtextureontothecertainregionstoexaminethereplacementeffectinrealtime.
Itshowsthatwrinklesofclothandlightsofshadearewellpreservedafterthemapping(whichisshowedinfigure3).
Sincewe'vespecifiedandsavedtherealsizesforeverytextureclothandblindmodel,thevisualizationeffectsareconsistentwiththoseunderrealenvironment.
Inordertoachievesoftwaregeneral-purpose,wealsoallowtheusertoloadnon-windowblindmodelimagesfromoutsidetemporarily.
Forinstance,importafashionmodelpicturetocarryonvirtualtry-ondemonstration.
a.
beforereplacementb.
afterreplacementFigure3:ComparisonofwindowsblindsplacementeffectInordertocausethetexturemappedontotothewindowblindmodelatthesametimeitcanextendnaturallyaccordingtothebasepicture'sfoldandsuspends,weusedasemiautomaticmechanism.
That'sthedivisionofsub-areasforeveryborderandthespecificationofdirectionsforeveryarea(seefigure3.
a).
Thepseudocodesofournoveltexturemappingalgorithmisshownbelow:Definitions:Bisasetofallbordersinthemodelimage,bisthecurrentborder;Aisasetofallsub-areaswithinb,aisthecurrentsub-area,a1,a2aretwoadjacentsub-areas;u,varetwotexturedirectionsofa;Nisasetofalladjacentsub-areasfora,Ri,Rjaretworegions(parallelconnectedsub-areas)thatthroughainiorjdirectionrespectively(i,jaretwonearlyperpendiculardirections)CalTextureCoordinates()1ForEachbBDo∈2ForEachaADo∈3CalTexCoor()withu、v//initializethecoordinates4PrepareRegions()amongN//findtheregionsincludecurrentarea5ForEachaR∈iDo6AjustTexICoor()//adjustcoordinatesinverticaldirection.
7ForEachaR∈jDo8AjustTexJCoor()//adjustcoordinatesinhorizontaldirection.
9ForEacha1,a2Aanda∈1∩a2≠0Do10SmoothTexCoor()betweena1,a2//smoothentheneighboringcoordinatesThesystemalsoofferstwoconvenientandpracticalauxiliarytoolstousers.
OneistheVirtualStamp.
Thegoalistopre-processthemodelimagebeforetexturereplacement,suchasdispellingthestains,oreliminatingthegrainsindeepcolorgirdpatterns(seefigure3,thedisappearanceofdark-redellipticalspotsintheleftandrightsidesincontrastwiththepatternsontop).
AnotherisPiecePaste.
Itenablestheuserstopastetheirinterestedpiecefromotherimageontotheirown(infigure4,wearepreparedtoputavaseontoatea-table).
Bothtoolsareplayingonekindofimageeditingrolesundersuitablesituation.
Theexperimentresultsareappropriateandeffective.
Figure4:ApplicationexamplesofPiecePasteInordertostrengthenthesystemtobeinteresting,wealsoprovidedsmallfunctionssuchas"FullScreenDisplay","AutomaticDemonstration","SpecialShowEffects","WallpaperReplacement"andsoon.
5.
CONCLUSIONANDPROSPECTInthispaper,wedesignedandimplementedacompletebusinessoriented2Dimage-basedvirtualpresentationandaideddesignsystemfortextileproducts.
Itisgroundedontheanalysisofattributesoftextileproductsandcharacteristicsofclothdealingbusiness.
Thesystemhasappliedtexturemapping,colorblending,automaticboundarydetection,imagelayers'separationandcombination,transparentmaskedbitmaps[14],digitalwatermarktechnologies,aswellasdatabaseandsoftwaresecuritymechanisms.
Ithastheadvantagesofrealisticexhibitioneffect,widespreadusingsituation,simpleandflexibleoperationmanners,andpowerfulopeningandexpansibility.
Andithasalreadyobtainedpromotionandapplicationinactualproductionlife,provedtobeamatureandproductivesystem.
Therearestillmanyaspectsthatneedtobecorrectedorimprovedinoursystem.
Firstly,themethodusedtoselectthereplacementregionsmaybemoreartificial,ratherthancurrentdrawingcontinuouspoints;Secondly,furtheroptimizingforcurrenttexturemappingandcolorblendingalgorithms,achievingmorerealisticeffect;Thirdly,transplantingfromLANeditiontoWEBedition.
Fourthly,developingathin-versionformobiledevicesisaverychallengework.
Finally,addingafewpracticalaideddesigntools,suchasdynamiceffectdemonstrationandvisualizationundermovinglightsourceandsoon.
6.
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