Erode volumetric mask

Source: R/format_data.R

Erode a volumetric mask by a certain number of voxel layers. For each layer, any in-mask voxel adjacent to at least one out-of-mask voxel is removed from the mask.

erode_vol(vol, n_erosion = 1, out_of_mask_val = NA)

Arguments

vol

The volume to erode. Out-of-mask voxels should be indicated by a value in out_of_mask_val.
n_erosion

The number of layers to erode the mask by.
out_of_mask_val

A voxel is not included in the mask if and only if its value is in this vector. The first value in this vector will be used to replace the eroded voxels. Default: NA.

Value

The eroded vol. It is the same as vol but with eroded voxels replaced with the value out_of_mask_val[1].

Details

Diagonal voxels are not considered adjacent, i.e. the voxel at (0,0,0) is not adjacent to the voxel at (1,1,0) or (1,1,1), although it is adjacent to (1,0,0).