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ID:14138215
大小:1.09 MB
页数:42页
时间:2018-07-26
《基于matlab的图像去噪算法研究与仿真_本科论文.doc》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要图像在获取和传输过程中会受到各种噪声的干扰,从而使得图像退化,造成图像质量下降。图像退化会引起图像模糊和特征淹没,从而不利于图像分析。为了去除噪声并改善图像质量,需要对图像进行去噪处理,从而有必要研究图像去噪算法。图像去噪算法有很多种,可以分别在空间域和频率域中进行。论文综述了平均值滤波、中值滤波、空间域低通滤波、多幅图像求平均法和频域低通滤波去噪算法。首先介绍了噪声的概念、产生的原因、分类及其特点。接着介绍了平均值滤波和中值滤波算法的基本原理及其适用范围,最后介绍了空间域低通滤波、频率域低通滤波和多幅图像求平均算法的基本原理。论文遵循理论联系实践,理论实践并重的研
2、究思路。不仅对各种去噪算法的理论基础和滤波原理作了详细的论述,而且使用MATLAB程序进行仿真并分析了去噪效果。论文最后设计了图形用户界面来评价各种算法的去噪效果。MATLAB仿真结果表明:各种去噪算法各有其优缺点。因此,在对一幅图像去噪之前,首先要分析噪声类型及其产生原因,然后再选择恰当的去噪算法,这样才能得到比较令人满意的去噪效果。关键词:图像噪声;图像去噪算法;MATLAB;图形用户界面IAbstractTheimagecanbeaffectedbynoiseduringtheprocessofacquisitionandtransmission.Theimage
3、noiseleadstoimagedegenerationanddropinquality.Imagedegenerationcancauseimagebluraswellascharacteristicmaskingsothatunfitforimageanalysis.Inordertoremovenoiseandimproveimagequality,noisereductionisneeded.Therefore,itisnecessarytostudyimagenoisereductionalgorithms.Therearemanykindsofimagen
4、oisereductionalgorithmsandtheycanbeimplementedinspatialdomainandfrequencydomainrespectively.Thispapersummarizessuchalgorithmasmeanfilter,medianfilter,lowpassfilterinspatialdomain,meanofmulti-imageaddingandlowpassfilterinfrequencydomain.Firstly,conception,causing,classificationandcharacte
5、risticofnoiseareintroduced.Secondly,thebasicprincipleandapplicationrangeofmeanfilterandmedianfilteralgorithmisintroduced.Finally,thebasicprincipleoflowpassfilterinspatialdomain,lowpassfilterinfrequencydomainandmeanofmulti-imageaddingalgorithmisintroduced.Thispaperpaysbothattentiontotheor
6、yandpractice.Itnotonlysummarizesthetheoryandfilterprincipleofdifferentimagenoisereductionalgorithmsindetail,butalsosimulatesthemusingMATLABprocedureandanalyzestheirnoisereductionresults.Thegraphicuserinterfaceisdesignedtoevaluatetheresultofnoisereductiontodifferentimagenoisereductionalgo
7、rithmsTheMATLABsimulationresultsdemonstratethatdifferentnoisereductionalgorithmsareofdifferentadvantagesanddisadvantages.Therefore,typeandcausingofnoiseshouldbeanalyzedfirstandthenappropriatenoisereductionalgorithmisselectedbeforeimagenoisereductionsoastoacquiresatisfacto
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