OpenCV-Python not displaying image

Question

I am currently following a tutorial on how to use OpenCV with python but something isn't working. When i run this code that should display an image i get this error: error: C:\builds\master_PackSlaveAddon-win32-vc12-static\opencv\modules\highgui\src\window.cpp:271: error: (-215) size.width>0 && size.height>0 in function cv::imshow

Here is the code

import numpy as np
import cv2

img = cv2.imread('C:\Users\Ive\Downloads\7.jpg',0)
cv2.imshow("image",img)
cv2.waitKey(0)
cv2.destroyAllWindows()

Someone already asked this question on here but the answer didn't work for me. The answer was to remove the unnecessary quotes. But i don't have them.

Try img = cv2.imread('C:\\Users\\Ive\\Downloads\\7.jpg',0) (Escape backslash) See also here — Miki
– Miki, Commented Aug 9, 2015 at 10:54
curious: Doesn't the python interface require using the namedWindow function first to create a window? — Photon
– Photon, Commented Aug 9, 2015 at 10:55
It's working, thanks. But can you explain why is it working? — Ive Zenzerovic
– Ive Zenzerovic, Commented Aug 9, 2015 at 10:55
As you know, "\n" (new line), "\t" (tab) etc have a well defined meaning. "\U", "\I" etc don't. So your string is ill-formed. Try printing the string with and without escaping backslashes, and you'll see that one is a valid pathname, the other is not. — Miki
– Miki, Commented Aug 9, 2015 at 10:58

Community · Accepted Answer · 2017-05-23 12:13:51Z

3

You need to escape backslashes, or your string will be ill-formed. This will work:

img = cv2.imread('C:\\Users\\Ive\\Downloads\\7.jpg',0)

You can find here additional information.

edited May 23, 2017 at 12:13

CommunityBot

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answered Aug 9, 2015 at 10:59

Miki

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