def calc_cent_scale(img):
    """
    Calculates the centre of an image and the correct scale value.

    Parameters
    ----------
    img : numpy.ndarray
        The image to process.

    Returns
    -------
    c : int
        The coordinates of the centre of the image.
    s : float
        The scale of the image in relation to a 200x200 image.
    """
    imgw = img.shape[1];
    imgh = img.shape[0];
    
    c = (int(imgw / 2), int(imgh / 2));
    s = imgh / 200;
    
    return c , s;