Installing OpenCV for Python on Ubuntu getting ImportError No module named cv2 cv

Question

I have an Ubuntu 14 04 system  on which I want to install OpenCV and use it with Python 2 x   I installed OpenCV using the instructions here  https   help ubuntu com community OpenCV  The install seemed to run properly  no errors  the script ended with output   OpenCV 2 4 9 ready to be used   When I try to run the sample Python script  I get the following     python opencv py Traceback  most recent call last     File  opencv py   line 1  in  lt module gt      from cv2 cv import   ImportError  No module named cv2 cv   I suspect I know why  I just don t know how to fix it  OpenCV installed to the current directory I was in when I ran the install script  it s a subdirectory of my home folder    Others who get this import error after install seem to be having a path issue  and have luck adding this to their code   import sys sys path append   usr local lib python2 7 site-packages     or updating their PYTHONPATH with that same directory  I tried adding that code  it doesn t make a difference  I don t see any files in the  site-packages  directory  Should I have done the install in that directory  I imagine the installation instructions would have spelled that out  I suspect that my problem has to do with Python not finding the OpenCV install  but I m not sure how to proceed   Please help me get a usable install of OpenCV as simply as possible

User · Answer

I found a solution in the guide here   http   www samontab com web 2014 06 installing-opencv-2-4-9-in-ubuntu-14-04-lts   I resorted to compiling and installing from source  The process was very smooth  had I known  I would have started with that instead of trying to find a more simple way to install  Hopefully this information is helpful to someone

User · Answer

If you really sure that you installed cv2 but it gives no module error  There is a solution for this  Probably you have cv2 so file in your directory   usr local lib python2 7 site-packages cv2 so   move this cv2 so file to   usr lib python2 7 site-packages   copy the file into site-packages directory

User · Answer

This seemed to work for me on Max OSX  https   anaconda org menpo opencv3  conda install -c menpo opencv3 3 1 0   I confirmed that you can import cv2 in python using python2 7 and python3

User · Answer

You can build for source following the official OpenCV tutorial  The crucial part is to set the PYTHON3 EXECUTABLE  PYTHON LIBRARY  PYTHON3 PACKAGES PATH and PYTHON3 NUMPY INCLUDE DIRS parameters for python3 6  Here are all the steps    Clone the repo  git clone https   github com opencv opencv git  Create build directory  cd   opencv mkdir build cd build  Configure  cmake -D CMAKE BUILD TYPE RELEASE         -D CMAKE INSTALL PREFIX  usr local            -D PYTHON INCLUDE DIR  usr include python3 6         -D PYTHON INCLUDE DIR2  usr include x86 64-linux-gnu python3 6m         -D BUILD NEW PYTHON SUPPORT ON         -D BUILD opencv python3 ON         -D HAVE opencv python3 ON         -D INSTALL PYTHON EXAMPLES ON         -D PYTHON3 EXECUTABLE  usr bin python3 6         -D PYTHON DEFAULT EXECUTABLE  usr bin python3 6         -D PYTHON LIBRARY  usr lib x86 64-linux-gnu libpython3 6m so         -D PYTHON3 PACKAGES PATH  usr lib python3 dist-packages            -D PYTHON3 NUMPY INCLUDE DIRS  home user  local lib python3 6 site-packages numpy core include   Build  make -j8  Install libraries  sudo make install  Test  python3 import cv2    If you don t get the error  No module named cv2   then the installation was successful   Note  If you don t know the path to numpy for the PYTHON3 NUMPY INCLUDE DIRS parameter  you can find it by executing import numpy and then numpy   file   in a python3 shell

User · Answer

I also had this issue  Tried different things  But finally  conda install opencv   worked for me

User · Answer

My environment     Ubuntu 15 10 Python 3 5   Since none of the previous answers worked for me  I downloaded OpenCV 3 0 from http   opencv org downloads html and followed the installation manual  I used the following cmake command       Programs opencv-3 0 0  cmake -D CMAKE BUILD TYPE Release -D CMAKE INSTALL PREFIX  usr local -D PYTHON3 EXECUTABLE  usr bin python3 5 -D PYTHON INCLUDE DIR  usr include python3 5 -D PYTHON INCLUDE DIR2  usr include x86 64-linux-gnu python3 5m -D PYTHON LIBRARY  usr lib x86 64-linux-gnu libpython3 5m so -D PYTHON3 NUMPY INCLUDE DIRS  usr lib python3 dist-packages numpy core include  -D PYTHON3 PACKAGES PATH  usr lib python3 dist-packages      Each step of the tutorial is important  Particularly  don t forget to call sudo make install

User · Answer

For me  this problem was due to the fact that I had not appropriately sym-linked the cv2 so file in the   virtualenvs cv lib python3 5 site-packages folder  the name of your virualenv may not be  cv   your version of python may not be 3 5--adjust accordingly     If you go to the    virtualenvs cv lib python3 5 site-packages folder and ls  the cv2 so file should appear in light blue  Ubuntu 16 04  showing that it is linked  You can check the link location by typing  readlink cv2 so   If cv2 so appears in red  as mine did   rm the file and type   for my install of python 3 5   ln -s  usr local lib python3 5 dist-packages cv2 cpython-35m-x86 64-linux-gnu so cv2 so   OR  if you have python 3 6   ln -s  usr local lib python3 6 dist-packages cv2 cpython-36m-x86 64-linux-gnu so cv2 so   If you are working in python 2 6 or python 2 7  you instead type   ln -s  usr local lib python2 7 dist-packages cv2 so cv2 so   If the cv2 so or cv2 cpython-36m-x86 64-linux-gnu so files do not exist in your  usr local lib python    dist-packages location  check to see if they re in a  usr local lib python    sites-packages folder  If so  adjust the path accordingly  If not  something has gone wrong with your opencv installation   This answer was inspired by information here  https   www pyimagesearch com 2016 10 24 ubuntu-16-04-how-to-install-opencv

User · Answer

If you want as simple as possible  install from the repository   sudo apt-get install python-opencv libopencv-dev python-numpy python-dev

User · Answer

Try using  from cv2 import cv  It works for me

User · Answer

Use pip      https   pypi python org pypi pip     pip install SomePackage           Successfully installed SomePackage   And when you add a path to PYTHONPATH with sys  PYTHONPATH it s always restarted to default values when you close your Python shell  Check this thread      Permanently add a directory to PYTHONPATH   First add openCV to your path  Quick guide       https   help ubuntu com community OpenCV   after that  install the non-python packages pyopencv depends on   sudo apt-get build-dep python-opencv   finally  use pip   pip install pyopencv   Also  you can check this tutorial to install openCV in ubuntu 14 04 LTS     http   www samontab com web 2014 06 installing-opencv-2-4-9-in-ubuntu-14-04-lts

User · Answer

Its complete installation nightmare  but I ll give one more hope you can avoid building opencv from source    pip install opencv-contrib-python

User · Answer

Find where the cv2 so is  for example  usr local lib python2 7 dist-packages  then add this into your    bashrc by doing   sudo gedit    bashrc   and add   export PYTHONPATH  usr local lib python2 7 dist-packages  PYTHONPATH   In the last line  And then remember to open another terminal  this can be work  and I have solve my problem  Hope it can help you

User · Answer

if you are using pycharm platform it s very simple go into view  tool windows   python console after that you will see in the bottom the console with  1    type this  pip install opencv-python

User · Answer

For those who are trying to use 3 1 0 but after installing python says  cv2 module not found    You likely have python but not python-dev   sudo apt-get install python-dev   then reinstall 3 1 0 and it ll work

User · Answer

try using sudo apt install python3-opencv it will install the latest package of open cv  Or you could try reinstalling the opencv package  It might have got corrupted during installation

User · Answer

I think you don t have the python-opencv package   I had the exact same problem and   sudo apt-get install python-opencv   solved the issue for me   you can install opencv from the following link  https   www learnopencv com install-opencv3-on-ubuntu  It works for me    apt-get install doesnt contain many packages of opencv

User · Answer

Verify if cv2 so did compile  should be placed in   usr local lib python2 7 site-packages Then export that path like this  export PYTHONPATH  usr local lib python2 7 site-packages  PYTHONPATH   Same as in the answer here

User · Answer

Create a symbolic link to OpenCV  Eg   cd    virtualenvs cv lib python2 7 site-packages  ln -s  usr local lib python2 7 dist-packages cv2 so cv2 so ln -s  usr local lib python2 7 dist-packages cv py cv py

User · Answer

I tried all the other options here  but I could not get import cv2 working with Anaconda on Ubuntu  This is the only thing that helped   pip install opencv-python

User · Answer

Try conda install -c conda-forge opencv if you are using anaconda  it works

[python] Installing OpenCV for Python on Ubuntu, getting ImportError: No module named cv2.cv

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