OpenCV error the function is not implemented

Question

I m trying to get OpenCV working with Python on my Ubuntu machine   I ve downloaded and installed OpenCV  but when I attempt to run the following python code  which should capture images from a webcam and push them to the screen   import cv  cv NamedWindow  w1   cv CV WINDOW AUTOSIZE  capture   cv CaptureFromCAM 0   def repeat        frame   cv QueryFrame capture      cv ShowImage  w1   frame      time sleep 10   while True      repeat     I get the following 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   So I do what they ask  install the packages  move to the folder from whence I installed OpenCV  and run  sudo make uninstall make sudo make install   But when I try to run the python  it gives me the same error   Am I missing something

User · Answer

If you installed OpenCV using the opencv-python pip package at any point in time, 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

User · Answer

Before installing  libgtk2 0-dev and pkg-config or libqt4-dev  Make sure that you have uninstalled opencv  You can confirm this by running import cv2 on your python shell  If it fails  then install the needed packages and re-run cmake

User · Answer

If it s giving you errors with gtk  try qt   sudo apt-get install libqt4-dev cmake -D WITH QT ON    make sudo make install   If this doesn t work  there s an easy way out   sudo apt-get install libopencv-    This will download all the required dependencies although it seems that you have all the required libraries installed  but still you could try it once   This will probably install OpenCV 2 3 1  Ubuntu 12 04   But since you have OpenCV 2 4 3 in  usr local lib include this path in  etc ld so conf and do ldconfig  So now whenever you use OpenCV  you d use the latest version  This is not the best way to do it but if you re still having problems with qt or gtk  try this once  This should work   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  e g   at the line of cv2 namedWindow name  with error  cv2 error  OpenCV 3 4 2   The function is not implemented    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

User · Answer

Don t waste your time trying to resolve this issue  this was made clear by the makers themselves  Instead of cv2 imshow   use this   img   cv2 imread  path to image   plt imshow img  cmap    gray   interpolation    bicubic   plt xticks      plt yticks        to hide tick values on X and Y axis plt show

User · Answer

I hope this answer is still useful  despite problem seems to be quite old   If you have Anaconda installed  and your OpenCV does not support GTK   as in this case   you can simply type  conda install -c menpo opencv 2 4 11   It will install suitable OpenCV version that does not produce a mentioned error  Besides  it will reinstall previously installed OpenCV if there was one as a part of Anaconda

[python] OpenCV error: the function is not implemented

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