dev(narugo): add env check

import cv2

import numpy as np

from PIL import Image

from cv2.ximgproc import guidedFilter

from ..data import load_image

try:

    from cv2.ximgproc import guidedFilter

except (ImportError, ModuleNotFoundError):

    guidedFilter = None

def _check_environment():

    if guidedFilter is None:

        raise EnvironmentError('opencv-contrib-python is not available.\n'

                               'Please install `opencv-contrib-python`.')

def remove_adversarial_noise(

        image: Image.Image, diameter_min: int = 4, diameter_max: int = 6,

    :return: Image with adversarial noise removed.

    :rtype: Image.Image

    """

    _check_environment()

    image = load_image(image, mode='RGB', force_background='white')

    img = np.array(image).astype(np.float32)

    y = img.copy()