I'm trying to draw a bounding box on an image using OpenCV2. I'm using aiohttp.ClientSession()
to make a request to an image and I'm using cv2.imdecode
to read the image.
My code ends up something like:
async with aiohttp.ClientSession() as session:
async with session.get(attachment.proxy_url, headers={
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36 Edg/92.0.902.55'
}) as resp:
image = await resp.content.read()
nparr = np.fromstring(image, dtype=np.uint8)
cvimg = cv2.imdecode(nparr, cv2.IMREAD_COLOR)
# *hopefully* get to this point without erroring
Usually when it gets to the imdecode part, it errors with 'utf-8' codec can't decode byte 0x89 in position 0: invalid start byte
.
The image that opencv is trying to load is https://media.discordapp.net/attachments/831327584364920862/870406065257336852/photo-1571577275698-54f36820ee9b.png
Try this and see if it works:
import base64
import json
import cv2
import numpy as np
async with aiohttp.ClientSession() as session:
async with session.get(attachment.proxy_url, headers={
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36 Edg/92.0.902.55'
}) as resp:
image = await resp.content.read()
jpg_original = base64.b64decode(image)
jpg_as_np = np.frombuffer(jpg_original, dtype=np.uint8)
img = cv2.imdecode(jpg_as_np, flags=1)
I got it too work. Turns out it was a different section of code that threw this error, and was unrelated to the snippets I sent.
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