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时间: 2019-12-25 15:01
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LinearimageprocessingisbasedonthesametwotechniquesasconventionalDSP:convolutionandFourieranalysis.Convolutionisthemoreimportantofthesetwo,sinceimageshavetheirinformationencodedinthespatialdomainratherthanthefrequencydomain.Linearfilteringcanimproveimagesinmanyways:sharpeningtheedgesofobjects,reducingrandomnoise,correctingforunequalillumination,deconvolutiontocorrectforblurandmotion,etc.Theseproceduresarecarriedoutbyconvolvingtheoriginalimagewithanappropriatefilterkernel,producingthefilteredimage.Aseriousproblemwithimageconvolutionistheenormousnumberofcalculationsthatneedtobeperformed,oftenresultinginunacceptablylongexecutiontimes.Thischapterpresentsstrategiesfordesigningfilterkernelsforvariousimageprocessingtasks.Twoimportanttechniquesforreducingtheexecutiontimearealsodescribed:convolutionbyseparabilityandFFTconvolution.CHAPTERLinearImageProcessing24LinearimageprocessingisbasedonthesametwotechniquesasconventionalDSP:convolutionandFourieranalysis.Convolutionisthemoreimportantofthesetwo,sinceimageshavetheirinformationencodedinthespatialdomainratherthanthefrequencydomain.Linearfilteringcanimproveimagesinmanyways:sharpeningtheedgesofobjects,reducingrandomnoise,correctingforunequalillumination,deconvolutiontocorrectforblurandmotion,etc.Theseproceduresarecarriedoutbyconvolvingtheoriginalimagewithanappropriatefilterkernel,producingthefilteredimage.Aseriousproblemwithimageconvolutionistheenormousnumberofcalculationsthatneedtobeperformed,oftenresultinginunacceptably……