fn erode_sphere(
mask: &[bool],
(nx, ny, nz): (usize, usize, usize),
r: i64,
) -> Vec<bool>Expand description
imerode(mask, strel('sphere', r)): a voxel stays if every voxel of the ball of radius r
voxels around it is in the mask, counting voxels outside the array as in the mask (MATLAB’s
border rule for erosion).