Function imageproc::filter::filter3x3

pub fn filter3x3<P, K, S>(
    image: &Image<P>, 
    kernel: &[K]
) -> Image<ChannelMap<P, S>> where
    P::Subpixel: ValueInto<K>,
    S: Clamp<K> + Primitive + 'static,
    P: WithChannel<S> + 'static,
    K: Num + Copy, 

Returns 2d correlation of an image with a 3x3 row-major kernel. Intermediate calculations are performed at type K, and the results clamped to subpixel type S. Pads by continuity.