performs the morphological operations and dilation to "shave" observations off of the interior or exterior of a cartridge case surface matrix.

preProcess_erode(x3p, region, morphRadius = 50)

## Arguments

x3p

an x3p object

region

either "interior," meaning the observations around the firing pin hole will be eroded, or "exterior," meaning the observations around the outer edge of the cartridge case primer will be eroded