基于全相位DCT的图像内插方法研究与方向滤波器组设计

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1、天津大学硕士学位论文基于全相位DCT的图像内插方法研究与方向滤波器组设计姓名：何凡申请学位级别：硕士专业：信号与信息处理指导教师：侯正信20080501ABSTRACTWiththedevelopmentofdigitalsignalprocessingtechnologydevelopsgradually．Intechnologyhascomeintoallaspectsofhumanindustry，geologyandotherfields．processingtechnology,digit

2、alimagerecentyears，digitalimageprocessinglife，forexample，inmilitary,medicine，Imageinterpolationisaprocessthatcontinuoussignalsarerecoveredthroughdiscretedigitalimage．Inthefieldofdigitalsignalprocessing，becauseofthediscretestyleofinformationstore，moreme

3、aningfulapproachofimageinterpolationistOchangethesamplingrateofdigitalimage，thatistosay,toregenerateahigher-resolutionimagefromtheoriginallow—resolutionone．Imageisatypicaltwo。dimensionaldata，andthecontentoftheimagehasdirectionalproperty．Nowadays，morean

4、dmorepeopledoresearchbasedonimagedirectionalrepresentationandmulti-resolutionimageprocessing．Thispaperdescribesanimageinterpolationmethodbasedonaseparabletwo-dimensionalAllPhaseDCT,designsarelativelyfairinterpolationexperiment，andcomparesthismethodwith

5、nearestneighborhoodinterpolation，linearinterpolation，cubicB-splineinterpolation，cubicconvolutioninterpolation，waveletinterpolationwithzerocoefficientshigh-frequencysubband，andedge—detectedinterpolation．Inthemeanwhile，thispaperpointsouttheunreasonableas

6、pectofwaveletinterpolation，andgivesawaveletinterpolationmethodwithgraymaintained．ExperimentalresultsshowthatimageinterpolationmethodbasedonallphaseDCThasaverygoodperformance．ThelatterpartofthispaperintroducesdesignmethodofallphaseDCT,anddesignstwOkinds

7、ofallphaseDCTdirectionalfilterbank．OneistheallphaseDCTdirectionfilterbankwithrotationstructure，whichdividesthefrequencywithanyprecision；theotherhasmoreaccuratefrequencydivisioninhorizontalandverticaldirection，andeight-directionandsixteen—directionfilte

8、rbanksareimplementedinthispaperwiththismethod．KEYWORDS：imageinterpolation；directionalfilterbank；discretecosinetransform；allphaseDCT(APDCT)独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作和取得的研究成果，除了文中特别加以标注和致谢之处外，论文中不包含其他人已经发表或撰写过的研究成果，也不包含为获得苤鲞盘堂或其他教育