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ID:12822748
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页数:25页
时间:2018-07-19
《利用离散余弦变换进行图像压缩毕业论文外文翻译》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、拟建中的阜阳市中国XXXX国际服装城依托中国XX国际服装城,拟建成为皖西北地区规格最高、规模最大、商务及功能最优的现代化、国际化服装专业市场,建设规模占地约128亩,建筑面积约25万平方米,项目总投资约5亿元人民币。经过1--2年的开发建设,能达到正常运营期的中国XX.XX国际服装城将吸纳全国和世界各地的经销商、代理商企业物流总部等500—1000家,预计年交易额实现68亿元人民币,每年实现税收8000—10000万元人民币,每年实现利润1.68亿元人民币,实现就业和创业人员约2万以上。ImageCompressionUsingtheDiscreteCosineT
2、ransformAbstractThediscretecosinetransform(DCT)isatechniqueforconvertingasignalintoelementaryfrequencycomponents.Itiswidelyusedinimagecompression.HerewedevelopsomesimplefunctionstocomputetheDCTandtocompressimages.ThesefunctionsillustratethepowerofMathematicaintheprototypingofimageproc
3、essingalgorithms.Therapidgrowthofdigitalimagingapplications,includingdesktoppublishing,multimedia,teleconferencing,andhigh-definitiontelevision(HDTV)hasincreasedtheneedforeffectiveandstandardizedimagecompressiontechniques.AmongtheemergingstandardsareJPEG,forcompressionofstillimages[Wa
4、llace1991];MPEG,forcompressionofmotionvideo[Puri1992];andCCITTH.261(alsoknownasPx64),forcompressionofvideotelephonyandteleconferencing.Allthreeofthesestandardsemployabasictechniqueknownasthediscretecosinetransform(DCT).DevelopedbyAhmed,Natarajan,andRao[1974],theDCTisacloserelativeofth
5、ediscreteFouriertransform(DFT).ItsapplicationtoimagecompressionwaspioneeredbyChenandPratt[1984].Inthisarticle,IwilldevelopsomesimplefunctionstocomputetheDCTandshowhowitisusedforimagecompression.Wehaveusedthesefunctionsinourlaboratorytoexploremethodsofoptimizingimagecompressionforthehu
6、manviewer,usinginformationaboutthehumanvisualsystem[Watson1993].ThegoalofthispaperistoillustratetheuseofMathematicainimageprocessingandtoprovidethereaderwiththebasictoolsforfurtherexplorationofthissubject.TheOne-DimensionalDiscreteCosineTransformThediscretecosinetransformofalistofnrea
7、lnumberss(x),x=0,...,n-1,isthelistoflengthngivenby:s(u)=C(u)u=0,…nwhereforu=0=1otherwiseEachelementofthetransformedlistS(u)istheinner(dot)productoftheinputlists(x)andbasisvector.Theconstantfactorsarechosensothatthebasisvectorsareorthogonalandnormalized.Theeightbasisvectorsforn=8aresho
8、wninF
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