从指定 URL 读取图像并以 OpenCV 格式返回的函数（从指定 URL 读取图像并使其可由 OpenCV 处理。）

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import requests
from io import BytesIO

import cv2
import numpy as np
from PIL import Image
from fake_useragent import UserAgent


def imread_from_url(url, seek_index=0, debug=False):
    image = None

    # URLから画像を取得
    ua = UserAgent()
    header = {'User-Agent': str(ua.chrome)}
    response = requests.get(url, headers=header)

    # PILでURLの画像を読み込み
    try:
        image = Image.open(BytesIO(response.content))
    except Exception as e:
        print(e)
        return None

    if debug:
        print(image)
        print(image.size)
        print(dir(image))

    # アニメーションGIF等の複数枚ある画像はシーク
    if 'n_frames' in dir(image):
        if debug:
            print('n_frames', image.n_frames)
            print('seek_index', seek_index)

        if 0 <= seek_index < image.n_frames:
            image.seek(seek_index)
        elif seek_index < 0:
            print(&