Python Opencv imshow error

Question

I try on some trial.. i build

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 ..

and if i try on python :

import cv2

print(cv2.version)

3.2.0

my full code : (https://www.solarianprogrammer.com/2016/09/17/install-opencv-3-with-python-3-on-windows/)

import cv2
image = cv2.imread("/home/reigin/Pictures/games.jpg")
gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
cv2.imshow("Over the Clouds", image)
cv2.imshow("Over the Clouds - gray", gray_image)
cv2.waitKey(0)
cv2.destroyAllWindows()

i got error on this :

cv2.imshow("Over the Clouds", image)
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 /io/opencv/modules/highgui/src/window.cpp, line 583
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
cv2.error: /io/opencv/modules/highgui/src/window.cpp:583: 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

i set my dpk-configure :

reigin@reigin-K43SA:~$ echo $PKG_CONFIG_PATH
/usr/local/lib/pkgconfig:/usr/lib/x86_64-linux-gnu/pkgconfig:/usr/lib/pkgconfig

if i do other than show my image no any problem..

can't help :

opencv 3.0 python imshow error

http://vinllen.com/solve-error-libgtk2-0-dev-and-pkg-config-when-install-opencv/

http://answers.opencv.org/question/57945/opencv-gui-with-gtk-2-solved/

https://askubuntu.com/questions/210210/pkg-config-path-environment-variable

Thanks for pay attention and help..

Answer 1

You might be using the pip opencv-python that doesn't support GTK. Your python bindings must come from your build of opencv.

Check your /usr/local/lib/python2.7/site-packages/ folder and make sure you have a cv2.so file from your compilation and installation of opencv, and that you're not using the package from pip's opencv-python in dist-packages.

See here: http://www.pyimagesearch.com/2015/06/22/install-opencv-3-0-and-python-2-7-on-ubuntu/

Here was my Cmake line to prepare for installation:

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D WITH_GTK=ON -D WITH_V4L=ON -D WITH_OPENGL=ON -D WITH_CUBLAS=ON -DWITH_QT=OFF -DCUDA_NVCC_FLAGS="-D_FORCE_INLINES" ..

Do note that this assumes you've installed the appropriate libgtk via sudo apt-get install libgtk2.0-dev.

This is what CMake should spit out:

-- GUI:

-- QT: NO

-- GTK+ 2.x: YES (ver 2.24.30)

-- GThread : YES (ver 2.48.2)

-- GtkGlExt: YES (ver 1.2.0)

-- OpenGL support: YES (/usr/lib/x86_64-linux-gnu/libGLU.so /usr/lib/x86_64-linux-gnu/libGL.so)

-- VTK support: YES (ver 6.2.0)