OpenCV not working properly with python on Linux with anaconda. Getting error that cv2.imshow() is not implemented

Question

This is the exact error that I am getting. My OS is Ubuntu 16.10.

OpenCV Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in cvShowImage, file /feedstock_root/build_artefacts/work/opencv-3.1.0/modules/highgui/src/window.cpp, line 545 Traceback (most recent call last): File "untitled.py", line 7, in cv2.imshow('image',img) cv2.error: /feedstock_root/build_artefacts/work/opencv-3.1.0/modules/highgui/src/window.cpp:545: error: (-2) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function cvShowImage

my code is:

import numpy as np
import cv2

# Load an color image in grayscale
img = cv2.imread('0002.png',0)

cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

0002.png is an image in the same directory as the program. I first installed anaconda with python 3.5, then I installed opencv by using the command

conda install -c conda-forge opencv

I installed libgtk2.0-dev just as the error said to but I still get the same error. Any help would be much appreciated. I've been trying to solve this for several hours.

Answer 1

1.The easiest way:

conda remove opencv
conda update conda
conda install --channel menpo opencv

or (for OpenCV 3.1) :

conda install -c menpo opencv3

2.And if u don't want to do this, you can try to use matplotlib .

import cv2
import matplotlib.pyplot as plt

img = cv2.imread('img.jpg',0)

plt.imshow(img, cmap='gray')
plt.show()

3.Or try to build library by your own with option WITH_GTK=ON , or smth like that.

Update - 18th Jun 2019

I got this error on my Ubuntu(18.04.1 LTS) system for openCV 3.4.2, as the method call to cv2.imshow was failing. I am using anaconda. Just the below 2 steps helped me resolve:

conda remove opencv
conda install -c conda-forge opencv=4.1.0

If you are using pip, you can try

pip install opencv-contrib-python