Correctionforreconstructed images wasthat the ring artifacts in theC coordinateweretransformedinto thevertical line artifactsinthe polar coordi removedas sinogram correction．Thefirst methodis al(ind of image prepro Anotherone belongs to imagepostprocessing．In mostcasescorrectionsare o applied to sinogramdata．The setof algorithms enable virtuallycompletering removalfrom tomographic imagery withminimalto negligible contaminatio nderlying data．

图像阈值分割.doc

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