Function purrmitive::imageops::filter3x3

pub fn filter3x3<I, P, S>(
    image: &I, 
    kernel: &[f32]
) -> ImageBuffer<P, Vec<S, Global>> where
    P: Pixel<Subpixel = S> + 'static,
    S: Primitive + 'static,
    I: GenericImageView<Pixel = P>, 

Perform a 3x3 box filter on the supplied image. kernel is an array of the filter weights of length 9.