简介:InthispaperthedesignandimplementationofMulti-Dimensional(MD)filter,particularly3-Dimensional(3D)filter,arepresented.Digital(discretedomain)filtersappliedtoimageandvideosignalprocessingusingthenovel3Dmultiratealgorithmsforefficientimplementationofmovingobjectextractionareengineeredwithanexample.Themultirate(decimationand/orinterpolation)signalprocessingalgorithmscanachievesignificantsavingsincomputationandmemoryusage.Theproposedalgorithmusesthemappingrelationsofz-transferfunctionsbetweennon-multirateandmultiratemathematicalexpressionsintermsoftime-varyingcoefficientinsteadoftraditionalpolyphasede-compositioncounterparts.ThemappingpropertiescanbereadilyusedtoefficientlyanalyzeandsynthesizeMDmultiratefilters.
简介:Thispaperpresentsanefficienttechniqueforprocessingof3Dmeshedsurfacesviasphericalwavelets.Morespecifically,aninput3Dmeshisfirstlytransformedintoasphericalvectorsignalbyafastlowdistortionsphericalparameterizationapproachbasedonsymmetryanalysisof3Dmeshes.Thissignalisthensampledonthespherewiththehelpofanadaptivesamplingscheme.Finally,thesampledsignalistransformedintothewaveletdomainaccordingtosphericalwavelettransformwheremany3Dmeshprocessingoperationscanbeimplementedsuchassmoothing,enhancement,compression,andsoon.Ourmaincontributionliesinincorporatingafastlowdistortionsphericalparameterizationapproachandanadaptivesamplingschemeintotheframeforprocessing3Dmeshedsurfacesbysphericalwavelets,whichcanhandlesurfaceswithcomplexshapes.Anumberofexperimentalexamplesdemonstratethatouralgorithmisrobustandefficient.
简介:Thispaperpresentsadirectmethodtofindtheinternalfaces.Itusesfoursetsofinformation:1getthecoordinatesofeachpointonthe3Dcompositeobjects;2basedonthe3Dcoordinatestocalculatealltheplaneequationoftwoobjects;3calculatealltheintersectinglinesofthetwoobjectsandexcludetheintersectinglineswhicharenotwithinthescopeoftheplane;4findingtheinternalface,theremainingintersectinglinesformedtheplaneistheinternalfaceofthetwoobjects.Weproposedanewalgorithmforfindinginternalfaces.Thisalgorithmcouldbeadaptedtoanyregularcompositeobjects.Thealgorithmworkswellforfindinginternalfaces.