Hey everyone,
previously I was able to use the OpenCV but after I did system restore, I am not able to use it anymore. I have Ubuntu 18.04 installed on WSL and working on ROS. There are two versions of OpenCV installed:
- 4.3.0-dev (when I check the version via python: >>>print cv2.__version__)
- 3.2.0 (this is when I check with: $ pkg-config --modversion opencv)
when I run this:
$ rosrun read_image show_image.py
I get this error:
read an image from file
create a window holder for the image
display the image
Traceback (most recent call last):
File "/home/candas/catkin_ws/src/read_image/src/show_image.py", line 17, in <module>
cv2.imshow("Image",img) # show the image, name of the display
cv2.error: OpenCV(4.3.0-dev) /home/candas/opencv_build/opencv/modules/highgui/src/window.cpp:376: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'
The code I am trying to run is to read and display the image:
#!/usr/bin/env python
#import numpy: the data structure that will handle an image
import numpy as np # stores all the pixels of image
#import openCV
import cv2
print 'read an image from file'
img = cv2.imread("images/apple-touch-icon-144x144-precomposed.png")
print 'create a window holder for the image'
cv2.namedWindow("Image",cv2.WINDOW_NORMAL) # name of the window, resize
print 'display the image'
cv2.imshow("Image",img) # show the image, name of the display
Is it because, there are different versions installed? Or the way I define the path? Or CMakeLists.txt? I would be glad if you could help. Thanks
