mtheSpatialandFourierdomaintotheWavelettransformdomain.EversinceDonoho’sWaveletbasedthresholdapproachwaspublishedin,therewasasurgeinthede-noisingpapersbeingpublished.AlthoughDonoho’sconceptwasnotrevolutionary,hismethodsdidnotrequiretrackingorcorrelationofthewaveletmaximaandminimaacrossthedifferentscalesasproposedbyMallat.Thus,therewasarenewedinterestinwaveletbasedde-noisingtechniquessinceDonohodemonstratedasimpleapproachtoadifficultproblem.Researcherspublisheddifferentwaystocomputetheparametersforthethresholdofwaveletcoefficients.Dataadaptivethresholdswereintroducedtoachieveoptimumvalueofthreshold.LatereffortsfoundthatsubstantialimprovementsinperceptualqualitycouldbeobtainedbytranslationinvariantmethodsbasedonthresholdofanUn-decimatedWaveletTransform.Thesethresholdtechniqueswereappliedtothenon-orthogonalwaveletcoefficientstoreduceartifacts.Multi-waveletswer