Segmentation of certain regions defined on a firearm cartridge case forsuccessful automaticmatching of cartridge cases after a cartridge is fired, on the basis of themarks left on thecartridge cases fired. Disclosed is a method for segmentation of a cartridgecase base byusing surface height matrix information comprising; detecting the center ofthe cartridgecase base; according to this center, obtaining the polar height matrix bysubjecting thesurface height matrix to polar transformation; acquiring a one-dimensionalsignal, "AverageHeight Signal on Basis Radius (AHSBR), by calculation of the mean value on theradius axisapplied on the polar height matrix; determining regions similar to circlesignal models on theAHSBR and detecting circles; determining the firing pin mark region bythresholdprocessing of the primer region surface height matrix. Letters on thecartridge case base aredetected by using slope matrices.
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