OpenCV open image with URL

Question

I keep getting an error when running the code below

import cv2
import urllib3 as urllib
import requests
import numpy as np

url = "https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fwallup.net%2Fwp-content%2Fuploads%2F2016%2F03%2F10%2F343179-landscape-nature.jpg"

r = requests.get(url)

imgar = np.array(bytearray(r.text,'utf-8'),dtype=np.uint8)
img = cv2.imdecode(imgar,-1)
cv2.imshow('img',img)
cv2.waitKey()

Error:

cv2.imshow('img',img)
cv2.error: OpenCV(4.5.1) C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-kh7iq4w7\opencv\modules\highgui\src\window.cpp:376: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'

This error keeps happening no matter what I change the photo to and I'm unsure why, thanks

Answer 1

You can try this:

import urllib.request
url_response = urllib.request.urlopen(url)
img_array = np.array(bytearray(url_response.read()), dtype=np.uint8)
img = cv2.imdecode(img_array, -1)
cv2.imshow('URL Image', img)
cv2.waitKey()

An alternative way:

import cv2
import urllib3 as urllib
import requests
import numpy as np
import io
import PIL
url = "https://s3-us-west-2.amazonaws.com/uw-s3-cdn/wp-content/uploads/sites/6/2017/11/04133712/waterfall-750x500.jpg"
r = requests.get(url)

response = requests.get(url)
image_bytes = io.BytesIO(response.content)
img = PIL.Image.open(image_bytes)
img.show()