def METHOD_NAME(self, im):
    """
    Args:
        im (np.ndarray): image (np.ndarray)
    Returns:
        im_scale_x: the resize ratio of X
        im_scale_y: the resize ratio of Y
    """
    origin_shape = im.shape[:2]
    im_c = im.shape[2]
    if self.keep_ratio:
        im_size_min = np.min(origin_shape)
        im_size_max = np.max(origin_shape)
        target_size_min = np.min(self.target_size)
        target_size_max = np.max(self.target_size)
        im_scale = float(target_size_min) / float(im_size_min)
        if np.round(im_scale * im_size_max) > target_size_max:
            im_scale = float(target_size_max) / float(im_size_max)
        im_scale_x = im_scale
        im_scale_y = im_scale
    else:
        resize_h, resize_w = self.target_size
        im_scale_y = resize_h / float(origin_shape[0])
        im_scale_x = resize_w / float(origin_shape[1])
    return im_scale_y, im_scale_x