def bbox_rot90(bbox, factor, rows, cols):
    """Rotates a bounding box by 90 degrees CCW (see np.rot90)

    Args:
        bbox (tuple): A tuple (x_min, y_min, x_max, y_max).
        factor (int): Number of CCW rotations. Must be in range [0;3] See np.rot90.
        rows (int): Image rows.
        cols (int): Image cols.
    """
    if factor < 0 or factor > 3:
        raise ValueError("Parameter n must be in range [0;3]")
    x_min, y_min, x_max, y_max = bbox
    if factor == 1:
        bbox = [y_min, 1 - x_max, y_max, 1 - x_min]
    if factor == 2:
        bbox = [1 - x_max, 1 - y_max, 1 - x_min, 1 - y_min]
    if factor == 3:
        bbox = [1 - y_max, x_min, 1 - y_min, x_max]
    return bbox