Function `filter3x3`

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

Perform a 3x3 box filter on the supplied image.

Arguments:

image - source image.
kernel - is an array of the filter weights of length 9.

This method typically assumes that the input is scene-linear light. If it is not, color distortion may occur.