Contourlet变换在图像处理中的应用研究的中期报告-第一文库 | 海量文档资源下载与分享平台

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Contourlet变换在图像处理中的应用研究的中期报告（本报告使用英文撰写）1.IntroductionContourlettransformisanextensionofwavelettransformthatisspecificallydesignedtocapturetheedgesandotherfinedetailsinanimage.Ithasbeenwidelyusedinvariousimageprocessingapplications,suchasimagedenoising,imagecompression,andimagerestoration.Inthismidtermreport,wewilldiscusstheuseofcontourlettransforminimageprocessingandthecurrentresearchinthisarea.2.ContourletTransformThecontourlettransformisadirectionalandmulti-scaletransformthatdecomposesanimageintosub-bandsatdifferentscalesanddirections.Thetransformationprocessconsistsoftwostages:thefirststageinvolvesthedecompositionoftheimageusingafilterbank,whilethesecondstageinvolvestheuseofadirectionalfilterbanktocapturethedirectionalinformationofthesub-bands.Thecontourlettransformisabletoprovidesparseimagerepresentations,whichcanbeusedforvariousimageprocessingtasks.3.Applications3.1ImageDenoisingThecontourlettransformhasbeenwidelyusedinimagedenoisingapplications.Thecontourletcoefficientsofnoisyimagesarethresholdedtoremovethenoise,andthentheinversecontourlettransformisappliedtoobtainthedenoisedimage.Thecontourlettransformhasbeenshowntobesuperiorindenoisingcomparedtoothertransformssuchasthewavelettransformandcurvelettransform.3.2ImageCompressionThecontourlettransformhasalsobeenappliedtoimagecompression.Thecontourletcoefficientsarequantizedandthenencodedusingvariouscompressionalgorithms.Thecompressedimagecanbereconstructedbyapplyingtheinversecontourlettransform.Thecontourlettransformhasbeenshowntohavebettercompressionperformancethanthewavelettransformandcurvelettransform.3.3ImageRestorationThecontourlettransformhasalsobeenusedinimagerestorationapplications,suchasimagedeblurringandimagesuper-resolution.Inimagedeblurring,theblurredimageisfirstdecomposedusingthecontourlettransform,andthenthecontourletcoefficientsarethresholdedtoremovenoise.Theinversecontourlettransformisappliedtoobtaintherestoredimage.Inimagesuper-resolution,thecontourlettransformisusedtoextracthigh-frequ