数字图像增强算法的研究与实现摘要人类在对信息进行获取、互换之时，图像这一载体能够发挥重要作用，相关研究表明，人类感知的外界信息中，从视觉这一渠道获得的信息占比超过80%。所以，图像处理能够在各行各业都得到充分运用。经分析可知，所谓图像增强，指的是根据相关需求将图像信息分类两类，一类为无用信息；一类为有用信息，然后对前者进行削弱或消除，对后者进行强化和突出，如此获得的图像用机器识别起来更加容易，和人眼视觉特性也更加相符。能够发现，如今图像增强技术在诸多行业比如人物摄影以及医学成像等行业得到了充分运用，在各类图像处理算法比如目标跟踪算法或者图像融合算法中，图像增强可以作为预处理算法发挥极大作用。在图像处理中，处于预处理环节的图像增强拥有重要意义和价值，其主要是对图像进行低层次处理，同时发挥承接前后环节的作用，要想令图像高层次处理获得不错的效果，就必须先做好图像增强工作，如此图像视觉效果才能够获得优化和完善，对其用机器识别起来才更加容易，和人眼视觉特性也才更加相符，观察这类图像，人们能够快速得到所需数据信息。此次基于频域法图像增强理论来展开研究，先对频域法的低通/高通滤波进行了研究，然而借助MATLAB完成了巴特沃斯滤波器等相关滤波器的仿真工作，经研究发现，不论是滤波属于低通滤波还是高通滤波，它们都能够令图像质量得到优化和完善。关键词：图像增强；数字图像，对比度增强算法，频域；滤波ⅠABSTRACTWhenhumanbeingsacquireandexchangeinformation,image,asacarrier,canplayanimportantrole.Relevantstudiesshowthatintheexternalinformationperceivedbyhumanbeings,theinformationobtainedfromthevisualchannelaccountsformorethan80%.Therefore,imageprocessingcanbefullyusedinallwalksoflife.Theanalysisshowsthattheso-calledimageenhancementreferstotheclassificationofimageinformationintotwocategoriesaccordingtotherelevantneeds,oneisuselessinformation;Oneisusefulinformation,andthentheformerisweakenedoreliminated,andthelatterisstrengthenedandhighlighted.Theimageobtainedinthiswayiseasiertorecognizebymachineandmoreconsistentwithhumanvisualcharacteristics.Itcanbefoundthatimageenhancementtechnologyhasbeenfullyusedinmanyindustries,suchaspeoplephotographyandmedicalimaging.Invariousimageprocessingalgorithms,suchastargettrackingalgorithmorimagefusionalgorithm,imageenhancementcanplayagreatroleasapreprocessingalgorithm.Inimageprocessing,imageenhancementinpreprocessingisofgreatsignificanceandvalue.Itmainlydealswiththelow-levelimageprocessing,andplaystheroleofpreandpostlinks.Inordertoachievegoodresultsinhigh-levelimageprocessing,wemustfirstdoagoodjobinimageenhancement,sothattheimagevisualeffectcanbeoptimizedandimproved,Itiseasiertorecognizeitbymachine,anditismoreconsistentwiththecharacteristicsofhumanvision.Peoplecanquicklygettherequireddatainformationbyobservingsuchimages.Thisresearchisbasedontheimageenhancementtheoryoffrequencydomainmethod.Firstly,thelow-pass/highpassfilteroffrequencydomainmethodisstudied.However,thesimulationofButterworthfilterandotherrelatedfiltersiscompletedwiththehelpofMATLAB.Itisfoundthatwhetherthefilterbelongstolow-passfilterorhighpassfilter,theycanoptimizeandimprovetheimagequality.Keywords:imageenhancement;Digitalimage,contrastenhancementalgorithm,frequencydomain;filteringⅢⅢ目录摘要................................................................................................................IABSTRACT....................................................................................................II1绪论.......................................................................................................
