Assertion failure : size.width>0 && size.height>0 in function imshow

Question

i am using opencv2 and python on raspberry pi. and i am new with python and opencv. i tried to read a jpeg image and display image it shows the following error:

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Answer 1

In my case, I had forgotten to change the working directory of my terminal to that of my code+testImage. Hence, it failed to find the image there.

Finally, this is what worked for me:

I saved the image and Python file on Desktop. I changed my cmd directory to it,

cd Desktop

And then checked for my file:

ls

And this was my code that worked:

import cv2
import numpy as np

im = cv2.imread('unnamed.jpg')
#Display the image
cv2.imshow('im',im)
cv2.waitKey(2000) #Milliseconds