将来自网络的图像存储到 Python 中的变量中

Question

我有很多图片的URL存储在网络上，一个URL的例子如下：

https://m.media-amazon.com/images/M/MV5BOWE4M2UwNWEtODFjOS00M2JiLTlhOGQtNTljZjI5ZTZlM2MzXkEyXkFqcGdeQXVyNjUwNzk3NDc@._V1_QL75_UX190_CR0

我想从上述类似的 URL 加载图像，然后对该图像执行一些操作，然后返回结果图像。

这是我的代码：

def get_image_from_url(url, path):
    try: 
        # downloading image from url
        img = requests.get(url)
        with open(path, 'wb') as f:
            f.write(img.content)

        # reading image, str(path) since path is object of Pathlib's path class
        img = cv2.imread(str(path), cv2.IMREAD_COLOR)

        # some operations 
        
        # deleting that downloaded image since it is of no use now   
        if os.path.exists(path):
            os.remove(path)

        return resulting_image
    except Exception as e:
        return np.zeros((224, 224, 3), np.uint8)

但是这个过程花费了太多时间，所以我想而不是下载和删除图像，我会直接将 URL 上的图像加载到变量中。

类似这样的：

def store_image_from_url(url):
    image = get_image_from_url(url) # without downloading it into my computer 

    # do some operations 

    return resulting_image

有没有办法做到这一点？

谢谢

Answer 1

作为How can I read an image from an Internet URL in Python cv2, scikit image and mahotas?，它可以是这样的：

import cv2
import urllib
import numpy as np

def get_image_from_url(url):
    req = urllib.urlopen(url)
    arr = np.asarray(bytearray(req.read()), dtype=np.uint8)
    img = cv2.imdecode(arr, -1)
    return img