python-2.7 - 如何使用 Opencv 直接从 Azure Blob 存储读取图像，而不将其下载到本地文件？

Question

我想使用 Python 2.7 中的 opencv 3 从 Azure blob 存储读取图像。如何在不将 blob 下载到本地文件的情况下执行此操作？

Answer 1

根据我的经验，您可以尝试使用 get_blob_to_bytes 方法将 blob 下载为字节数组并将其转换为 opencv 图像，如下面的示例代码。

from azure.storage.blob import BlockBlobService

account_name = '<your-storage-account>'
account_key = '<your accout key>'
block_blob_service = BlockBlobService(account_name, account_key)

container_name = 'mycontainer'
blob_name = 'test.jpg'
blob = block_blob_service.get_blob_to_bytes(container_name, blob_name)

import numpy as np
import cv2
# use numpy to construct an array from the bytes
x = np.fromstring(blob.content, dtype='uint8')

# decode the array into an image
img = cv2.imdecode(x, cv2.IMREAD_UNCHANGED)
print img.shape

# show it
cv2.imshow("Image Window", img)
cv2.waitKey(0)

希望有帮助。