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1、学班学>I•［卩.1A指职本科毕业设计英文文献及翻译院级号名教师称ConceptsandDescriptionsof3DModelsInthefollowing,theconcepts,descriptionsandresearchdirectionsfornewly-developeddigitalmedia,3Dmodels,arepresented.Basedonthreeaspectoftechnicalrequirements,thebasicconceptsandthecommonly-usedtechniq
2、uesformultimediacompression,multimediawatermarking,multimediaretrievalandmultimediaperceptualhashingarethensummarized.3DModelsAmodelistheabstractrepresentationofanobjective,includingstructures,attributes,variationlawsandrelationshipsamongcomponents.3Dmodelsarethe
3、fourthgenerationofmultimediafollowingsound,imagesandvideos.A3Dmodelrepresentsa3Dobjectusingacollectionofpointsinthe3Dspace,connectedbyvariousgeometricentitiessuchastriangles,lines,curvedsurfaces,etc.AtypicalexampleisshowninFig.1」.Beingacollectionofdata(pointsando
4、therinformation),3Dmodelscanbecreatedbyhand,algorithmically(proceduralmodeling),orscanned.3Dmodelshavebeenwidelyusedanywherein3Dgraphics-Actually,theirusepredatesthewidespreaduseof3Dgraphicsonpersonalcomputers.Manycomputergamesusepre-renderedimagesof3Dmodelasspri
5、tesbeforecomputerscanrendertheminreal-time.Today,3Dmodelsareusedinawidevarietyoffields.Themedicalindustryusesdetailedmodelsoforgans.Themovieindustryusesthemascharactersandobjectsforanimatedandreal-lifemotionpictures.Thevideogameindustryusesthemasassetsforcomputer
6、andvideogames.Thesciencesectorusesthemashighlydetailedmodelsofchemicalcompounds.Thearchitectureindustryusesthemtodemonstrateproposedbuildingsandlandscapesthroughsoftwarearchitecturalmodels.Theengineeringcommunityusesthemasdesignsofnewdevices,vehiclesandstructures
7、,aswellasforahostofotheruses.Inrecentdecades,theearthsciencecommunityhasstartedtoconstruct3Dgeologicalmodelsasastandardpractice.point-basedrepresentationshavebeengainingsomepopularityinrecentyears,deformingsurfaceswhichprocessoftransformingpointcoordinateofaapoly
8、gonrepresentationwhere3Dmodelscanberoughlyclassifiedintotwocategories:(1)Solidmodels.Thesemodelsdefinethevolumeoftheobjecttheyrepresent(likearock).Thesearemore
