Function rustflow::coarse2fine_flow

pub fn coarse2fine_flow(
    img1: &DynamicImage, 
    img2: &DynamicImage, 
    alpha: f64, 
    ratio: f64, 
    min_width: i32, 
    num_outer_fp_iters: i32, 
    num_inner_fp_iters: i32, 
    num_sor_iters: i32, 
    col_type: i32
)