python：如何直接从字节字符串变量显示图像？

Question

I have a byte string variable fig which I get from another API.

print(fig)

b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\....'

How can I display a picture directly from this variable?

PS: I don't want to store this variable in a PNG file, then use matplotlib to read and show.

I have tried PIL.Image.frombytes https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.frombytes however, I don't know which mode( https://pillow.readthedocs.io/en/stable/handbook/concepts.html#concept-modes ) I have to choose. It reports errors when I tried several modes.

Answer 1

Something like this should help:

import numpy as np
import cv2

nparr = np.fromstring(img_str, np.uint8)
image = cv2.imdecode(nparr, -1)

cv2.imshow('image', image)
cv2.waitKey(0)