fast scaling technology in video transcoding

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1、上海师范大学硕士学位论文FastScalingTechnologyInVideoTranscoding姓名：董文涛申请学位级别：硕士专业：计算机应用技术指导教师：张文龙20040401AcknowledgementsIamextremelygratefultoProfessorZhangWenLong，forhisexcellentguidance，constantencouragement，andsupportduringthecourseofmystudy．ProfessorWangYaoMing，Yo

2、uWeiYan，LiLi，HuJinChualsoimpartsomuchknowledgetome．Aslo，Iappreciatemyroommates：DuanXinTao，ZhangPeiJun，／rioandmyclassmatesQinXiaoLing，ChangZhiGuo，HuZiHui，etc．TheyhavemademylifeandstlldyatSHNUanenjoyableexperience．Lastofall，Itakethisopportunitytothankmycolle

3、ague：SeniorScientistZhangDaQing，Kelvin．Zhang，Kelvin．Wang，Jim．J．Wang，ChenNingJiang，WanXin，ZengYongQin，Simon@OpticalStorage&DigitalTVDepartment，Cathy．sLTong@HRandothermembersfromPhilipsResearchEastAsia(PREA)，NalinfromPhilipsDigitalSystemLab(PDSL)．ABSTRACTFas

4、timagescalingwithhighfidelityplaysakeyroleinvideoprocessingandcodecbyprovidingvariousresolution，reducingbitratestofacilitatevideotransmissionandachievingthebestvisualquailtyatthereceiver．Infact，scalingtechnologyiSanessentialcomponentinmanyimage／videoproces

5、singsuchastomagnify／minifystillimage．toachievespecialeffectlikepicturewin—picture，tocompressortransforindigitalvideowithspatialscalabilityetc．Inthisthesiswemainlyemploythistechnologyinvideotranscoding．whichiSapowerfulbutcomputationallyintensivetoolstoconve

6、rtonekindofvideoformatintoanother，meetingdifferentdemandsuchaslowerbitratesorvariousdisplayterminals．Insum．therearetwokindsofscalingschemes：oneisinspatialdomainandtheotherintransfoITlldomain．nleschemeintransfotindoraainCanprovideverygoodperformance．thatiS．

7、emcientcomputationanddesirableimagequaliW．whereasithassomedisadvantagewhichiSimpossibleorhardlytoovercome，especiallysomescenariosrequkearbitraryratiozoominhorizontalandvertical．andexcellentvisualefbct．However．theotherschemeinspatialdomaincaileasilytackleth

8、eseproblemsviaFIRfilter,providingmorefiexibilityandbetterquality．Notethatweachievethisgoalatexpenseofnumerouscomputationand丹equentmemoryI／0．Actually，itiSnotfeasibletoputSOmuchWOrkloadonscalingwhichiSonlyasubs