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35 个结果
  • 简介:Inthispaper,alargeclassofndimensionalorthogonalandbiorthognalwaveletfilters(lowpassandhighpass)arepresentedinexplicitexpression.Wealsocharacterizeorthogonalfilterswithlinearphaseinthiscase.Someexamplesarealsogiven,includingnonseparableorhogonalandbiorthogonalfilterswithlinearphase.

  • 标签: 有限小波滤子 显式表示 正交滤子 线性相 双正交滤子
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  • 简介:有珍视的模糊集合被考虑的间隔的模糊间隔价值的伪巧合的概念。事实上,这是有一个模糊集合的一个模糊的点的伪巧合的归纳。由使用这个新想法,间隔的观点珍视(∈,∈∨q)在是BL代数学的模糊过滤器的归纳的BL代数学的模糊过滤器,被定义,;相关性质被调查。特别地,有阀值的模糊亚群的概念被扩大到间隔的概念有在BL代数学的阀值的珍视的模糊过滤器。

  • 标签: BL-代数学 广义模糊滤波 模糊值 代数结构
  • 简介:Itiswidelyacceptedthatthedesignofmorphologicalfilters,whichareoptimalinsomesense,isadifficulttask.Inthispaperanovelmethodforoptimallearningofmorphologicalfilteringparameters(Genetictrainingalgorithmformorphologicalfilters,GTAMF)ispresented.GTAMFadoptsnewcrossoverandmutationoperatorscalledthecurvedcylindercrossoverandmaster-slavemutationtoachieveoptimalfilteringparametersinaglobalsearching.Experimentalresultsshowthatthismethodispractical,easytoextend,andmarkedlyimprovestheperformancesofmorphologicalfilters.Theoperationofamorphologicalfiltercanbedividedintotwobasicproblemsincludingmorphologicaloperationandstructuringelement(SE)selection.Therulesformorphologicaloperationsarepredefinedsothatthefilter'spropertiesdependmerelyontheselectionofSE.Bymeansofadaptiveoptimizationtraining,structuringelementspossesstheshapeandstructuralcharacteristicsofimagetargets,andgivespecificinformationtoSE.Morphologicalfiltersformedinthiswaybecomecertainlyintelligentandcanprovidegoodfilteringresultsandrobustadaptabilitytoimagetargetswithclutterbackground.

  • 标签: 图像合成 形态滤波器 自动目标探测
  • 简介:Inthispaper,anewtypeofresonantBrewsterfilters(RBF)withsurfacereliefstructureforthemultiplechannelsisfirstpresentedbyusingtherigorouscoupled-waveanalysisandtheS-matrixmethod.Bytuningthedepthofhomogeneouslayerwhichisunderthesurfacereliefstructure,themultiplechannelsphenomenonisobtained.Longrange,extremelylowsidebandsandmultiplechannelsarefoundwhentheRBFwithsurfacereliefstructureisilluminatedwithTransverseMagneticincidentpolarizationlightneartheBrewsteranglecalculatedwiththeeffectivemediatheoryofsubwavelengthgrating.Moreover,thewavelengthsofRBFwithsurfacereliefstructurecanbeeasilyshiftedbychangingthedepthofhomogeneouslayerwhileitsopticalpropertiessuchaslowsidebandreflectionandnarrowbandarenotspoiledwhenthedepthischanged.Furthermore,thevariationofthegratingthicknessdoesnoteffectivelychangetheresonantwavelengthofRBF,buthavearemarkableeffectonitslinewidth,whichisveryusefulfordesigningsuchfilterswithdifferentlinewidthsatdesiredwavelength.

  • 标签: 谐振布鲁斯特滤波器 共轭波分析 S矩阵法 有效介质理论
  • 简介:Weproposeimprovedmultilevelfilters(IMLFs)involvingtheabsolutevalueoperationintothealgorithmicframeworkoftraditionalmultilevelfilters(MLFs)toimprovetherobustnessofinfraredsmalltargetenhancementtechniquesunderacomplexinfraredclutteredbackground.Comparedwiththewidelyusedsmalltargetenhancementmethodswhichonlydealwithbrighttargets,theproposedtechniquecanen-hancetheinfraredsmalltarget,whetheritisbrightordark.Experimentalresultsverifythattheproposedtechniqueisefficientandpractical.

  • 标签: 红外小目标 过滤器 多级 增强技术 复杂背景 算法框架
  • 简介:在大规模上在因特网上由于部署因特网协议(IP)的困难多点传送,覆盖多点传送被看作了一种有希望的选择在最近的年里开发multicast通讯。然而,存在覆盖多点传送解决方案受不了高费用在提交树的multicast维持节点的州的信息。一个无状态的覆盖多点传送计划被建议,在哪个multicast路由信息被一个花蕾过滤器(BF)编码并且没有对维持提交树的multicast的任何需要,包含了进包头。我们的计划利用节点异质,在物理拓扑学并且层次地的最近信息由把几何坐标分到所有覆盖节点构造运输树桩覆盖拓扑学。更重要地,计划使用BF技术识别提交树的multicast的节点和连接,它改进提交的效率并且减少假积极的提交环。分析并且模拟结果证明这个建议能完成高提交效率和好可伸缩性。

  • 标签: 覆盖多点传送 BF 因特网节点坐标 网络了解
  • 简介:为微波photonic过滤器的一个一般理论模型基于多波长光来源和散媒介被总结并且介绍,并且被用于double-laser-based微波photonic槽口过滤器鈥?性能的分析。双边带(DSB)的不同影响调整并且单个边带(SSB)调整理论上被表明并且解释。而且,不同因素的影响微波photonic槽口过滤器的表演上的3dB带宽和光谱振幅失配例如频率间距,是也学习了。数字模拟结果在对预言的好同意,并且能为微波photonic过滤器的未来优化有益。CLC数字TN253这个工作被浙江省的科技系partically支持(资助没有。R104154)。

  • 标签: 光纤元件 微波纤维 激光 扩散技术
  • 简介:BeamalignmentdependsonCCDreal-timeimageanalysisandprocessing.Inordertoimprovethequalityofthealignment,multiplefiltersareusedinfar-fieldandnear-fieldimageprocessings.Thesemultiplefiltersareconstitutedofanaveragefilterandamedianfilterindifferentconnectionsequences,sothattheycandealwithdifferentkindsofnoise.Toreducetheeffectoftheunknownnonlinearrelationshipbetweenmotorrunningstepsanddeviationpixels,afeasiblemethodologyisofferedtoimprovethisphenomenonandafuzzyalgorithmisappliedtothemotorfeedbackcontrolprocess.Becauseofthefuzzycontrolitisnotnecessarytoestablishanaccuratemathematicalmodel,sotheimpactofthenonlinearrelationshipwillbereduced.

  • 标签: ALIGNMENT FUZZY control IMAGE processing MULTIPLE
  • 简介:Asystemofunequalthicknessinterferencefilterswithquarterwavelengthstackwhichconsistsofaspacersurroundedbytwomultilayerstacksisdesigned,andtheexamplesofthefilterdesignaregiven.Thiskindoffiltersarenotonlycharacterizedbyhigh-transparency,butalsobyhigh-reflection,therefore,itissuperiortothecommonequalthicknessinterferencesystemwithquarterwavelength.Itiseasiertocontrolthemanufacturingtechniquesofthenewdesignascomparedwiththatofinterferencefilterofnon-quarterwavelength.

  • 标签: 干扰滤波器 厚度不等 设计 四分之一波长存储器
  • 简介:为WTP的产品水的混浊标准根据在中国的南部的区域的饮料水的保护措施技术上的州的工程‘863'是0.1NTU。在激活的碳过滤器的混浊移动在飞行员规模测试被分析;在生物学上激活的碳(用绳子拖的平底渡船)改进混浊移动的一种创新技术过滤被提出以便满足标准。试验性的结果证明由增加polymerized铝氯化物(PAC)进BAC过滤器的提高的过滤在混浊控制是相当有效的。自河混浊在0.05mgL与PAC的增加为0.1100240NTU的流入的混浊与大约80%的高移动在0.033NTU的稳定的水平(平均数)被保留[1],完全为等于的filtrate混浊或不到0.1NTUC满足要求。另外,PAC剂量越大,越多降低自河混浊。然而,混浊移动的进一步的改进不为在0.l0mgL以外的PAC剂量是明显的,;在0.050.10mgL的范围的最佳的PAC剂量被建议。

  • 标签: 饮用水 BAC过滤器 C强化过滤 生物活性碳 浑浊度 有机物脱除
  • 简介:Inthispaperanewmethodtorealizerationalgeneralizedtransferfunctionsoflinearshift-variantdigitalfiltersthroughstatefeedbackispresentedInsomepracticalapplicationstherequiredcharacteristicsofthefilterchangeslowly.Underthesecircumstances,theproposedmethodisveryeffectiveandtheresultingfilterstructureissimple.Anumericalexampleisprovidedtoshowtheperformanceofthemethod.

  • 标签: LINEAR shift-variant digital filter Shift-variant IMPULSE
  • 简介:ThisworkisaimedtorigorouslymanagevoltagesaturationandmaximumcurrentconstraintsinShuntActiveFilters.Inthisrespect,assuming'unconstrained'controlalgorithmshavealreadybeendefinedtoachievestandardobjectivesforsuchdevices(i.e.currenttrackingforharmoniccompensationandDC-busvoltageboundness),aplug-inunit,orientedtoextendthesystemoperatingregionandatthesametimepreservinggoodperformanceunderlargetransientsandoverloadconditions,ispresented.Thissolutionallowstoimproveavailability,robustnessandcomposabilityofShuntActiveFilters,whichareexpectedtobekeyfeaturesinpresentandnextgenerationcomplexandpossibly'smart'powergrids.Theproposedunitiscomposedbytwoparts.First,asuitableanti-windupstrategyisdefinedinordertodealwithcontrolinputsaturation.Itsmainpurposeistopreservetheoriginal'unconstrainederrordynamics',infaceofinputsaturation,whileguaranteeinglowcomputationalburdenandreducedperformanceimpairment(thelattergoal,inharmoniccompensationcontext,leadstorathernon-standardproblemformulation).Tothisaim,theanti-windupactsonthecurrentreferencesthroughasuitably-designedadditionaldynamics.Then,inordertocopewithcurrentlimitations,anadditionalstrategyhasbeendesigned;againthecurrentreferencesissuitablyshapedtocomplywiththefeaturesandboundsofthesystem,augmentedwiththeabove-mentionedanti-windupsolution.TheproposedschemecanbesimplyjoinedtoanykindofunconstrainedcontrolleradoptedtosteerShuntActiveFilters.Inthiswork,anInternal-Model-basedcurrentcontrollerisadoptedasabenchmarkcase.Theproposedapproachisvalidatethroughextensivesimulationtests.

  • 标签: SHUNT ACTIVE FILTERS power quality ANTI-WINDUP
  • 简介:Weproposeanovelphotonictechniqueformicrowavefrequencymeasurementbasedontransversalmicrowavefilterswithhighresolution.Twoparallelmicrowavefilterswithsineandcosinefrequencyresponsesareobtainedbycrossgainmodulationinasinglesemiconductoropticalamplifier,whichintroducestwodifferentfrequencyresponsestoachieveanamplitudecomparisonfunction.Wealsodemonstrateaproof-of-conceptexperiment.Themeasurementerrorislessthan±0.04GHzforthefirstbandrangeof0–3.45GHzandlessthan±0.03GHzforthesecondbandrangeof3.45–5.8GHz.Ourschemeisfoundtobecapableofbeingextendedforlargerfrequencyrangemeasurementsusingashorterfiberlength.

  • 标签: 微波频率测量 微波滤波器 高分辨率 半导体光放大器 瞬时 交叉增益调制
  • 简介:ECGisanimportanttoolfortheprimarydiagnosisofheartdiseases,whichshowstheelectrophysiologyoftheheart.Inourmethod,asinglematernalabdominalECGsignalistakenasaninputsignalandthematernalP-QRS-Tcomplexesoforiginalsignalisaveragedandrepeatedandtakenasareferencesignal.LMSandRLSadaptivefiltersalgorithmsareapplied.TheresultsshowedthatthefetalECGshavebeensuccessfullydetected.TheaccuracyofDaisydatabasewasupto84%ofLMSand88%ofRLSwhilePhysioNetwasupto98%and96%forLMSandRLSrespectively.

  • 标签: 信号检测 自适应滤波器 RLS LMS 心电图 胎儿
  • 简介:光安全设备在对伪造的战斗起一个必要作用。在这份报纸,我们学习并且设计光过滤器基于metameric完成的一双金属电介质,它在观察的一个特定的角度由颜色移动提供隐藏的图象效果。与所有电介质相比多层的系统,金属电介质多层的结构让更大的颜色与改变事件角度,更高的颜色浸透和少数变层。最后,有5层的栈和7层被完成,并且颜色差别索引仅仅是0.71,它显示出匹配效果的好metameric。同时,当厚度偏差是牥и时,到免职错误的过滤器的敏感被分析

  • 标签: 光学滤光片 安全设备 电介质 同色异谱 金属 同分异构
  • 简介:AnewcompactopticalFanofiltersuitableforbiologicalsensingisproposed,whichpatternsphotoncrystalinsinglecrystallinesiliconnanomembranes(SiNMs)andtransferringontotransparentglasssubstrates.Theeffectsofairholesizeandsiliconthicknessonthetransmissioncharacteristicsofnewfilterarenumericallyinvestigatedbyusingthree-dimensionalfinite-differencetime-domain(FDTD)technique,thespectralresponseisalsostudiedbyback-fillingbioliquid.Theresultsshowthatthedipwavelengthwillshifttowardlongerwavelengthbyeitherreducingairholeradiusorfillingbio-liquid.Thenumberofdipswillincreasewiththeincreaseofsiliconthickness.Thesizeofproposedfiltercanbelessthan1mm2.

  • 标签: 二维光子晶体 生物传感 玻璃基板 过滤器 三维有限差分 光学遥感器