OpenCV GTK+2.x error

Question

I had installed OpenCV following these steps (). After trying to compile one examples,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 to solve it?

Answer 1

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 as 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

Answer 2

If you installed OpenCV using the opencv-python pip package, be aware of the following note, taken from https://pypi.python.org/pypi/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: http://www.pyimagesearch.com/2016/10/24/ubuntu-16-04-how-to-install-opencv/

Answer 3

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

1. Remove installed OpenCV version to avoid mess up later

   pip3 uninstall opencv-python 
   

2. Lower your python version to 3.5 (current version 3.6 has problems with conda which we will use to install OpenCV)

   conda install python=3.5
   

3. Finally, use conda to install working version of OpenCV

   conda install -c menpo opencv3 
   

And then voila: OpenCV will start working on your Mac OS(Siera 10.12.4).

Answer 4

In case what they mentioned above doesn't work, try:

pip install opencv-python

for python2, or

pip3 install opencv-python

for python3

Answer 5

@oxydron/Elliott Miller: I have Ubuntu 16.04 LTS environment with gtk 3 pre installed. 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

Answer 6

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

1. install pkg-config (sudo pacman -Syu pkg-config),
2. remove opencv from the environment (conda remove opencv) and
3. 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.

Answer 7

I have the solved using Anaconda 3 installing on Ubuntu 16.04.

I have used pycharm editor for my python code.

I am using python 3.6 version.

I solved the issue using these processes.

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

Answer 8

I have had to deal with this issue a couple of times, 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

Answer 9

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

There is no need to uninstall it first.

Answer 10

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

1. Firstly, remove the current opencv package that is installed in your system by typing in the following command in the terminal conda remove opencv.
2. 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.
3. Later on install the opencv package again by giving the following input in terminal conda install -c menpo opencv3

Answer 11

for windows just uninstall the OpenCV pip uninstall opencv-python and reinstall pip install opencv-python

Answer 12

If someone else ends up here like I did 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
• re-install OpenCV with ./vcpkg install opencv4 or whichever vcpkg command you used

Answer 13

my issue was solved after installing opencv-contrib-python

pip install opencv-contrib-python

Answer 14

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

Answer 15

I have fixed this issue by replacing

cvDestroyWindow("showImage");

by

cvDestroyWindow("ShowImage");