def METHOD_NAME(self, coords):
    '''Convert the bounding boxes back to the original image frame.
    Args:
        coords (numpy.ndarray):
            `N` x `M` array where `M >= 4` and first 4 elements
            of `M` are `x`, `y` (center coordinates of bounding box),
            `w` and `h` (bouding box width and height).
    '''
    return apply_inverse_letterbox_coordinate_transform(
        coords, self.im_w, self.im_h, self.new_w * 1.0 / self.width, self.new_h * 1.0 / self.height)