Decode base64 image in JSON with Python

Question

I receive from front-end an image in base64 into JSON file, and need take image and decode with OpenCV, the JSON there is:

{
     'photo': "b'/9j/4AAQSkZJR...(continue)"
}

and code is

obj = json.loads(json.dumps(event))
obj = obj['foto']
obj = bytes(obj,'utf-8')

obj_d = base64.decodebytes(obj)
print(type(obj_d))

img_buffer = np.frombuffer(obj_d, dtype=np.uint8)
print(img_buffer)
img = cv2.imdecode(img_buffer, flags=cv2.IMREAD_COLOR)
print(img.shape)

And received error is, AttributeError: 'NoneType' object has no attribute 'shape'.

When I code and decode in base64 the image in the Python, I not have problem.

people need to use debuggers, it helps a lot. Pycharm / Vscode are free and have great debuggers. — DevLounge
– DevLounge, Commented Mar 22, 2021 at 0:55
you might have to eval() the string that because it starts with b'...' but y'know security — bherbruck
– bherbruck, Commented Mar 22, 2021 at 1:00
Does this answer your question? Read a base 64 encoded image from memory using OpenCv python library — Maurice Meyer
– Maurice Meyer, Commented Mar 22, 2021 at 1:28
in the JSON you have 'photo' but in your code you try to read obj['foto']. This might be the problem. — jps
– jps, Commented Mar 22, 2021 at 8:11
JSON have obj['foto'], I wrote a previous version, and the error is with b'...', deleted this and works, thanks for yours help — Sebastián Guajardo Herrera
– Sebastián Guajardo Herrera, Commented Mar 22, 2021 at 14:48

Sebastián Guajardo Herrera · Accepted Answer · 2021-03-22 14:50:53Z

0

In the JSON I wrote previous version(not error in here), the error is in b'...', I deleted this in front-end or with other method and works

answered Mar 22, 2021 at 14:50

Sebastián Guajardo Herrera

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