Function image::imageops::filter3x3

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

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