denhanced.)Theenhancedimageafterdenoisingisgainedusingwaveletinversetransform.ThesimulationeffectofwaveletdenoisingthroughMatlabisshowninFig..originalimagewithimageaftermedianimageafterwaveletnoisefilteringdenoisingFig.thecomparisonoftwodenoisingmethodsComparingwiththetraditionalmatchedfilter,thehigh-frequencycomponentsofimagemaynotbedestroyedusingwavelettransformtodenoise.Inaddition,therearemanyadvantagessuchasthestrongadaptiveability,calculatingquickly,completelyreconstructed,etc.Sothesignaltonoiseratioofimagecanbeimprovedeffectivelymakinguseofwavelettransform.III.EDGEDETECTIONTheedgedetectionofdigitalimageisquiteimportantfoundationinthefieldofimageanalysisincludingimagedivision,identificationofobjectiveregionandpick-upofregionshapeandsoon.Edgedetectionisveryimportantinthedigitalimageprocessing,becausetheedgeisboundaryofthetargetandthobel算子可以处理图像噪声和灰度梯度。