Function sti_bounding_box 

fn sti_bounding_box(
    mask: &[u8],
    dims: (usize, usize, usize),
) -> Option<([usize; 3], [usize; 3])>

STI’s MaskBoundingBox: tight bounding box (0-based, inclusive); an odd extent grows by one voxel at the high end, or at the low end when the high end is the array edge (and shrinks by one at the high end when both ends are edges).