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1、EurographicsItalianChapterConference(2006)G.GalloandS.BattiatoandF.Stanco(Editors)ANewDescreeningTechniqueintheFrequencyDomainS.Battiato,F.StancoDipartimentodiMatematicaeInformatica,UniversityofCataniaVialeA.Doria,6-95125Catania,Italy{battiato,fstanco}@dmi.uni
2、ct.itAbstractInthispaperanewalgorithmtoobtainacontinuoustoneimagestartingfromahalftonedoneisproposed.ThisdescreeningtechniqueisbasedonButterworthfilteringinthefrequencydomain.Itremovesthepatternoftheoriginalscreenleavingunchangedthecolorsintheimage.Theproposeda
3、lgorithmensuresfastandeffectiveresults,andcanbeusedalsobynon-qualifiedoperators.CategoriesandSubjectDescriptors(accordingtoACMCCS):I.4.3[ImageprocessingandComputerVision]:Restoration1.Introductiontheyareappliedoveracontinuoustoneimage.Forexample,scalingascreene
4、dimageproducesseverealiasing.Toen-Agrayscalephotographhashundredsofshadesofgray,abletheseoperations,grayimagesneedtobereconstructedwhileblack-and-whitedisplaydevicesrequiresonlybinaryfromthehalftonesthroughinversehalftoningordescreen-images.Hence,whenanimageis
5、reproduced,thecontinuousing.However,thescreeningoperatorslostsomeinforma-toneimageisconvertedinabinaryimage.Thisconvertingtion,andthereisnowaytoreconstructaperfectgrayim-process,calledscreeningorhalftoning,breaksanimageintoagefromthegivenhalftonedimage.Manyeffi
6、cientinverseaseriesofdotswithdifferentsizes.Eachsizeapproximateahalftoningalgorithmshavebeendevelopedinthepastsev-shadeofcolor:agroupoflargedotsplacedcloselytogethereralyearstoimprovethequalityofthereconstructedimageappearsblack;agroupofsmallerdotswithlargersp
7、acesbe-(moredetailsinSection3).Often,theperformanceofthesetweenthemproducesaweakergrayshade;whileagroupofmethodsisrelatedtotheknowledgeoftheusedhalftoningevensmallerdotsspacedwidelyapartappearsalmostwhitealgorithm.Someofthese,improvethefinalqualityusing(Fig.1).
8、unsharpmaskingtechniques.Anyway,whenthehalftoningIntraditionalgraphicarts,screeningwasgenerallydonealgorithmisunknownorverydifficulttounderstand,theyusingascreen-likepatternetchedin
