opencv python error: Assertion failed (size.width>0 && size.height>0)

Question

I am getting an error while running the following code.

import cv2
import numpy as np
img = cv2.imread('messi.jpg',0)
img = cv2.line(img,(0,0),(50,50),(255,0,0),5)
cv2.imshow("image",img)
cv2.waitKey(0)
cv2.destroyAllWindows()

The error says:

OpenCV Error: Assertion failed (size.width>0 && size.height>0) in unknown function, file ......\src\opencv\modules\highgui\src\window.cpp, line 261

Traceback (most recent call last):

File "F:\Computer programming\scripts\OpenCv\1.py", line 6, in cv2.imshow("image",img) cv2.error: ......\src\opencv\modules\highgui\src\window.cpp:261: error: (-215) size.width>0 && size.height>0

If I remove the line:

img = cv2.line(img,(0,0),(50,50),(255,0,0),5)

the script works.

The message says your img is empty. Your file 'messi.jpg' is not in your working directory. You likely need to specify a proper path to it. — fmw42
– fmw42, Commented Dec 31, 2022 at 0:28

Loocid · Accepted Answer · 2015-06-09 03:25:52Z

4

Its because cv2.line returns None and you are assigning that to your img variable. So when you get to the next line and try to show the image, there is no image to be shown.

Replace img = cv2.line(img,(0,0),(50,50),(255,0,0),5) with cv2.line(img,(0,0),(50,50),(255,0,0),5)

1 Comment

Nil Over a year ago

The tutorial should be corrected Opencv drawing options

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