Function morphology_rect_u8 

pub fn morphology_rect_u8(
    input: ImageView<'_, u8, 1>,
    operation: MorphologyOperation,
    element: &StructuringElement,
    iterations: usize,
    border: BorderMode<u8, 1>,
) -> Result<Image<u8, 1>, VisionError>

Applies composite grayscale u8 morphology using the rectangular fast path.