OpenCV GTK+2.x error - "Unspecified error (The function is not implemented...)"

Question

I had installed OpenCV following these steps. After trying to compile one example, I got this error:

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 cvNamedWindow, file /home/nick/.Apps/opencv/modules/highgui/src/window.cpp, line 516
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/nick/.Apps/opencv/modules/highgui/src/window.cpp:516: 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 cvNamedWindow

CMakeLists.txt

cmake_minimum_required(VERSION 2.8.4)
project(threadTest)

find_package( OpenCV REQUIRED )


set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wextra -pthread")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "/home/nick/ClionProjects/threadTest")

set(SOURCE_FILES main.cpp)
add_executable(threadTest ${SOURCE_FILES})
target_link_libraries( threadTest ${OpenCV_LIBS} )

How can I solve it?

Just read the error message? It states: _The function is not implemented. Rebuild the library with [..] GTK+ 2.x [..] support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script_ If you are not using Ubuntu or Debian, try to figure out how the GTK 2.0 developer package is called and install it together with pkg-config. — usr1234567, Feb 28 '15 at 06:55
Does CMke find it? Have a look in the output. Maybe you have to path the path to Gtk to CMake. — usr1234567, Feb 28 '15 at 15:22

score 31 · Accepted Answer · edited Sep 02 '21 at 18:28

31

First check whether libgtk2.0-dev is installed properly. If you have installed aptitude package manager, run the following:

sudo aptitude search libgtk2.0-dev

It should return like this:

i  libgtk2.0-dev              - development files for the GTK+ library
p  libgtk2.0-dev:i386         - development files for the GTK+ library

You need to build the files once again. Locate your OpenCV folder. Create a new folder and name it Release. Enter into this folder. For example,

cd /home/user_name/OpenCv
mkdir Release
cd Release

Now build using CMake with following command:

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_GTK=ON -D WITH_OPENGL=ON ..

Remember to put WITH_GTK=ON during CMake.

After this step, enter the command,

make
sudo make install

This should resolve your problem. If you have broken dependencies for libgtk2.0-dev, then install a fresh copy of libgtk2.0-dev using aptitude.

sudo aptitude install libgtk2.0-dev

edited Sep 02 '21 at 18:28

Peter Mortensen

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answered Jun 22 '15 at 11:45

KiranCP

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5

Thanks. Basically, to solve the problem I had to recompile and install OpenCV with GTK, **WITH_GTK=ON**. – Thomio Sep 15 '15 at 19:08
7

Doesn't work on 2017. Even after doing all those steps, I still get the gtk error and can't do cv2.imshow. – Oxydron Mar 28 '17 at 17:58
@Thomio what is the command line you put to solve the problem? – ElleryL May 22 '17 at 07:30
if the problem with just GTK. Do i need to compile with openGL?? – Vivasvan Patel Jun 28 '21 at 16:56
This worked. I have been struggling so hard for resolving this issue, finally this solution worked – Aishwarya Patil Aug 28 '22 at 03:37

score 15 · Answer 2 · edited Sep 02 '21 at 18:20

If you installed OpenCV using the opencv-python pip package, be aware of the following note, taken from opencv-python:

IMPORTANT NOTE
macOS and Linux wheels have currently some limitations:

video related functionality is not supported (not compiled with FFmpeg)

for example cv2.imshow() will not work (not compiled with GTK+ 2.x or Carbon support)

Also note that to install from another source, first you must remove the opencv-python package.

To install OpenCV in Ubuntu, I followed this guide, and it worked perfectly fine: Ubuntu 16.04: How to install OpenCV

score 9 · Answer 3 · edited Sep 02 '21 at 18:30

9

In order to improve Nic Szer's answer I want to explain how to fix this error on macOS in three simple steps.

Remove installed OpenCV version to avoid messing up later
```
pip3 uninstall opencv-python
```
Lower your Python version to 3.5 (the current version, 3.6, has problems with Conda which we will use to install OpenCV)
```
conda install python=3.5
```
Finally, use Conda to install a working version of OpenCV
```
conda install -c menpo opencv3
```

And then voilà: OpenCV will start working on your macOS (macOS v10.12.4 (Sierra)).

edited Sep 02 '21 at 18:30

Peter Mortensen

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answered May 19 '17 at 07:57

hris.to

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Yeah you could also just edit my answer instead of selfishly seeking points. – Nic Szerman Sep 17 '21 at 16:20

score 6 · Answer 4 · edited Aug 14 '21 at 03:01

6

For Windows, just uninstall the OpenCV package:

pip uninstall opencv-python

And reinstall:

pip install opencv-python

edited Aug 14 '21 at 03:01

Peter Mortensen

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answered May 02 '20 at 16:59

Abhishek singh

61
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1

was gonna write this :) – Singh Nov 23 '21 at 17:33
small addition: in my case, i was uninstall `opencv-python-headless` yet – Volkov Maxim Jul 25 '22 at 10:28

score 5 · Answer 5 · edited Aug 14 '21 at 03:03

5

In case what is mentioned in previous answers doesn't work, try:

pip install opencv-python

for Python 2, or

pip3 install opencv-python

for Python 3.

edited Aug 14 '21 at 03:03

Peter Mortensen

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answered Jan 21 '19 at 08:52

Ahmed J.

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score 3 · Answer 6 · answered Feb 27 '18 at 21:51

For me (Arch Linux, Anaconda with Python 3.6), installing from the suggested channels menpo or loopbio did not change anything. My solution was to

install pkg-config (sudo pacman -Syu pkg-config),
remove opencv from the environment (conda remove opencv) and
re-install opencv from the conda-forge channel (conda install -c conda-forge opencv)

conda list now returns opencv 3.3.0 py36_blas_openblas_203 [blas_openblas] conda-forgeand all windows launched using cv2 are working fine.

score 2 · Answer 7 · edited Sep 02 '21 at 18:25

I have Ubuntu 16.04 LTS (Xenial Xerus) environment with GTK 3 preinstalled.

I got the same error for Caffe build (master branch), Try the following steps, may be it should work for you.

sudo apt-get install libgtk-3-dev
cmake .. (WITH_GTK=ON and other settings),
make

And bingo, the error was gone... in my Python Caffe code

Please note:

The CMake configuration should reflect GTK+ 3.x instead of GTK+ 2.x:

       GUI:
--     QT:                          NO
--     GTK+ 3.x:                    YES (ver 3.18.9)
--     GThread :                    YES (ver 2.48.2)
--     GtkGlExt:                    NO
--     OpenGL support:              NO
--     VTK support:                 NO

In the official opencv installation guide (https://docs.opencv.org/3.4.1/d7/d9f/tutorial_linux_install.html) they still link to libgtk2.0-dev. If your application uses Gtk3, then you should replace by libgtk-3-dev, as suggested by @SeCp — jmgonet, May 21 '18 at 05:08

score 2 · Answer 8 · edited Aug 14 '21 at 03:07

2

I have the solved using Anaconda 3 installing on Ubuntu 16.04 (Xenial Xerus).

I have used the PyCharm editor for my Python code.

I am using the Python 3.6 version.

I solved the issue using these processes.

IDEA: we need to install the package opencv-contrib-python package from PyCharm.

edited Aug 14 '21 at 03:07

Peter Mortensen

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answered Apr 14 '18 at 19:57

MK HASAN

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score 2 · Answer 9 · edited Aug 14 '21 at 03:05

2

I have had to deal with this issue a couple of times, and this is what has worked consistently thus far:

conda remove opencv
conda install -c menpo opencv
pip install --upgrade pip
pip install opencv-contrib-python

edited Aug 14 '21 at 03:05

Peter Mortensen

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answered Dec 12 '18 at 21:47

mrk

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score 2 · Answer 10 · edited Aug 14 '21 at 03:12

After installing OpenCV using vcpkg on Ubuntu, there is a known issue with vcpkg where you'll end up with the exact same error message as the top of this post with no access to highgui:

OpenCV(4.3.0) Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Cocoa support.
If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in cvNamedWindow,
file .../vcpkg/buildtrees/opencv4/src/4.3.0-0c6047baf6.clean/modules/highgui/src/window.cpp, line 634
Caught exception: OpenCV(4.3.0) .../vcpkg/buildtrees/opencv4/src/4.3.0-0c6047baf6.clean/modules/highgui/src/window.cpp:634:
error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Cocoa support.

If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function 'cvNamedWindow'

The problem is vcpkg passes in the build option -DWITH_GTK=OFF when building OpenCV. The open issue: https://github.com/microsoft/vcpkg/issues/12621

The workaround is the following:

edit the file vcpkg/ports/opencv4/portfile.cmake
find the line that says -DWITH_GTK=OFF and change it to say -DWITH_GTK=ON
run ./vcpkg remove opencv4
run sudo apt-get install libgtk2.0-dev pkg-config
reinstall OpenCV with ./vcpkg install opencv4 or whichever vcpkg command you used

score 2 · Answer 11 · answered May 11 '22 at 10:37

2

I have fixed my issue using this,try it

pip install opencv-python-headless==4.5.3.56 
pip install opencv-contrib-python==4.5.3.56
pip install opencv-python==4.5.3.56

answered May 11 '22 at 10:37

Ujwala Shinde

41
2

score 1 · Answer 12 · edited Dec 12 '18 at 22:13

1

I had the same problem, and fixed it by simply reinstalling opencv.

There is no need to uninstall it first.

edited Dec 12 '18 at 22:13

mrk

8,059
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answered Sep 06 '17 at 23:00

Z Cao

583
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score 1 · Answer 13 · edited Aug 14 '21 at 03:04

I tried several of the previous answers the one that worked for me in ubuntu is mentioned in the following steps:

Firstly, remove the current opencv package that is installed in your system by typing in the following command in the terminal conda remove opencv.
If your Python version is 3.6 or above then change it into the stable version which can be done by typing in conda install python=3.5.
Later on, install the opencv package again by giving the following input in terminal conda install -c menpo opencv3

score 1 · Answer 14 · edited Aug 14 '21 at 02:58

1

My issue was solved after installing opencv-contrib-python:

pip install opencv-contrib-python

edited Aug 14 '21 at 02:58

Peter Mortensen

30,738
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answered May 27 '21 at 05:51

Nannigalaxy

492
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score 0 · Answer 15 · answered Jul 27 '21 at 11:46

0

I had the same issue and it has been resolved after uninstalling opencv-python and doing a fresh install.

pip uninstall opencv-python
pip install opencv-python

answered Jul 27 '21 at 11:46

Bedir Yilmaz

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score 0 · Answer 16 · answered Sep 04 '21 at 07:01

0

try this. It worked for me

sudo apt-get install cmake cmake-curses-gui libgtk2.0-dev

answered Sep 04 '21 at 07:01

Shaik Ahmad

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score 0 · Answer 17 · answered Nov 23 '21 at 21:53

pip install opencv-contrib-python

reinstalling and installing with the above command solved my issue but just after closing all instances of pyhton and anaconda because apparently a cache version of the library was being kept in my system.

Hence, uninstall opencv (try with pip and conda), close the IDE and reboot it, check if you can import opencv. If you still can import it, try to run the code:

help(cv2)

and check where the files are stored and delete that folder. Repeat the process untill you are sure it is uninstalled so you can reinstall opencv full package (option 2 - see https://pypi.org/project/opencv-python/ )

score 0 · Answer 18 · answered May 12 '22 at 17:15

0

I had the same issue and it has been resolved after uninstalling opencv-python version 4 and then installing the OpenCV version 3.

pip install opencv-python==3.4.9.33

answered May 12 '22 at 17:15

Muzamal Ali

1
1

score -1 · Answer 19 · edited Aug 26 '17 at 08:23

-1

I have fixed this issue by replacing

cvDestroyWindow("showImage");

by

cvDestroyWindow("ShowImage");

edited Aug 26 '17 at 08:23

Pang

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answered Aug 26 '17 at 08:04

劉大為

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OpenCV GTK+2.x error - "Unspecified error (The function is not implemented...)"

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