简介:Amethod,calledTwo-DimensionalExtendedAttributeGrammars(2-DEAGs)fortherecognitionofhand-printedChinesecharactersispresented.Thismethodusesdirectlytwodimensionalinformation,andprovidesaschemefordealingwithvariouskindsofspecificcasesinauniformway.Inthismethod,componentsaredrawninguidedandredundantwayandreductionsaremadelevelbylevejustinaccordancewiththecomponentcombinationrelationsofChinesecharacters.Themethodprovidsalsopolysemousgrammars,coexistinggrammarsandstructureinferringswhihconstrainredundantrecognitionbycomparisonamongsimilarcharactersofcomponentsandgreatlyincreasethetoleranceabilitytodistortion.
简介:Aimingatachievingthehighaccuracy3Dmodelfromsliceimages,anewmodelreconstructionmethodusingsliceimagesisproposed.Wantingtoextracttheoutermostcontoursfromsliceimages,themethodoftheimprovedGVF-Snakemodelwithoptimizedforcefieldandraymethodisemployed.Andthen,the3Dmodelisreconstructedbycontourconnectionusingtheimprovedshortestdiagonalmethodandjudgmentfunctionofcontourfracture.Theresultsshowthattheaccuracyofreconstruction3Dmodelisimproved.
简介:A3D-viewishelpfultoinstantlygraspwhatispresentedinadrawing.Thereexistavarietyofwaystopresentthesamepartwith3D-views.Tofacilitatethechoiceofanoptimumoneamongthem,theworkdividescompositesolidmodelsintothreecategories,soastoconveytheoriginalityofdesignconciselyandaccuratelybyusingtheleast'engineeringlanguage'.
简介:Inthispaperweproposeasufficientconditionforminimalroutingin3-dimensional(3-D)mesheswithfaultynodes.Itisbasedonanearlyworkoftheauthoronminimalroutingin2-dimensional(2-D)meshes.Unlikemanytraditionalmodelsthatassumeallthenodesknowglobalfaultdistributionorjustadjacentfaultinformation,ourapproachisbasedontheconceptoflimitedglobalfaultinformation.First,weproposeafaultmodelcalledfaultycubeinwhichallfaultynodesinthesystemarecontainedinasetoffaultycubes.Faultinformationisthendistributedtolimitednumberofnodeswhileitisstillsufficienttosupportminimalrouting.Thelimitedfaultinformationcollectedateachnodeisrepresentedbyavectorcalledextendedsafetylevel.Theextendedsafetylevelassociatedwithanodecanbeusedtodeterminetheexistenceofaminimalpathfromthisnodetoagivendestination.Specifically,westudytheexistenceofminimalpathsatagivensourcenode,limiteddistributionoffaultinformation,minimalrouting,anddeadlock-freeandlivelock-freerouting.Ourresultsshowthatanyminimalroutingthatispartiallyadaptivecanbeappliedinourmodelaslongasthedestinationnodemeetsacertaincondition.Wealsoproposeadynamicplanar-adaptiveroutingschemethatoffersbetterfaulttoleranceandadaptivitythantheplanar-adaptiveroutingschemein3-Dmeshes.Ourapproachisthefirstattempttoaddressadaptiveandminimalroutingin3-Dmesheswithfaultynodesusinglimitedfaultinformation.