Python convert JPEG bytes to image array

Question

How can i pass row jpg data to OpenCV? i have the code that saves the image and then opens it again but it is to slow for my purpes, does someone know how to do it without saving?

import requests
from PIL import Image
from io import BytesIO 
import cv2

while True:
    response = requests.get("https://www.cleverfiles.com/howto/wp-content/uploads/2018/03/minion.jpg", stream=True, allow_redirects=True)
    image = Image.open(BytesIO(response.content))
    image.save(r'C:UsersmartiPicturesDesktopscriptsCAMIMG.jpg', 'JPEG')    #SAVE
    frame = cv2.imread(r'C:UsersmartiPicturesDesktopscriptsCAMIMG.jpg')    #OPEN    
    cv2.imshow("dfsdf",frame)
cv2.destroyAllWindows

Asked By: finix

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Source

Answer 1

To answer your initial question, you could do

import requests
from PIL import Image
import cv2
import numpy as np

url = "https://www.cleverfiles.com/howto/wp-content/uploads/2018/03/minion.jpg"
frame =  Image.open(requests.get(url, stream=True, allow_redirects=True).raw)
cv2.imshow("dfsdf", np.asarray(frame)[:,:,::-1])

But as per Mark’s comment and this answer, you can skip PIL altogether:

import requests
import cv2
import numpy as np

url = "https://www.cleverfiles.com/howto/wp-content/uploads/2018/03/minion.jpg"

# Fetch JPEG data
d = requests.get(url)
# Decode in-memory, compressed JPEG into Numpy array
frame = cv2.imdecode(np.frombuffer(d.content,np.uint8), cv2.IMREAD_COLOR)
cv2.imshow("dfsdf",frame)

Answered By: Keldorn

Python convert JPEG bytes to image array

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