Function binary_erosion 

pub fn binary_erosion(
    mask: &ArrayRef3<bool>,
    kernel: &ArrayRef3<bool>,
    iterations: usize,
) -> Mask

Binary erosion of a 3D binary image.

• mask - Binary image to be eroded.
• kernel - Structuring element used for the erosion. Must be of odd length. The center must be true.
• iterations - The erosion is repeated iterations times.