Install opencv for Python 3 3

Question

Is OpenCV still not available for Python 3 3 and do I really have to downgrade to Python 2 7 to use it  I didn t find much about it on the internet  only some posts from 2012 that OpenCV wasn t yet ported to be used in Python 3 x  But now it s 2014 and after trying to install the latest OpenCV 2 4 x and copying the cv2 pyd file to C  Program Files  x86  Python333 Lib site-packages this still yields the error in Python IDLE    gt  gt  gt  import cv2 Traceback  most recent call last     File   lt pyshell 0 gt    line 1  in  lt module gt      import cv2 ImportError  DLL load failed   1 ist keine zul  ssige Win32-Anwendung

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If you re down here    I m sorry the other options didn t workout  Try this   conda install -c menpo opencv3   from Step 1 of Scivision s Tutorial  If that doesn t work  then go on to Step 2       Windows only  OpenCV 3 2 pip install      Download OpenCV  whl file here  The packages that mention contrib in their name include   OpenCV-extra packages  For example  assuming you have Python 3 6  you   might download opencv python-3 2 0 contrib-cp36-none-win amd64 whl to get the OpenCV-extra packages       Then  from Command Prompt   pip install opencv python-3   yourVersion   win amd64 whl    Note that the    win amd64 whl wheels packages from step 2 in that tutorial are meant for AMD chips

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A full instruction relating to James Fletcher s answer can be found here  Particularly for Anaconda distribution I had to modify it this way    cmake -D CMAKE BUILD TYPE RELEASE       -D CMAKE INSTALL PREFIX  usr local       -D PYTHON3 PACKAGES PATH  anaconda lib python3 4 site-packages        -D PYTHON3 LIBRARY  anaconda lib libpython3 4m dylib       -D PYTHON3 INCLUDE DIR  anaconda include python3 4m       -D INSTALL C EXAMPLES ON       -D INSTALL PYTHON EXAMPLES ON       -D BUILD EXAMPLES ON       -D BUILD opencv python3 ON       -D OPENCV EXTRA MODULES PATH    opencv contrib modules      Last line can be ommited  see link above

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Spent 3 hours trying the various options on Ubuntu 14 04LTS mentioned here and in another referenced tutorial to no avail  For a while tried with OpenCV3 0 0 but eventually switched to 3 1 0  The following worked   cmake -D CMAKE BUILD TYPE RELEASE   -D PYTHON3 LIBRARY  usr lib x86 64-linux-gnu libpython3 4m so   -D PYTHON3 EXECUTABLE  usr bin python3 4m   -D PYTHON3 INCLUDE DIR  usr include python3 4m    -D PYTHON INCLUDE DIR  usr include python3 4m    -D PYTHON3 INCLUDE DIRS  usr include python3 4m    -D PYTHON INCLUDE DIRS  usr include python3 4m    -D BUILD opencv python3 ON       output   --   OpenCV modules  --     To be built                  core flann imgproc ml photo video imgcodecs shape videoio highgui objdetect superres ts features2d calib3d stitching videostab python3 --     Disabled                     java world --     Disabled by dependency       - --     Unavailable                  cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev python2 viz  --   Python 3  --     Interpreter                   usr bin python3 4m  ver 3 4 3  --     Libraries                     usr lib x86 64-linux-gnu libpython3 4m so  ver 3 4 3  --     numpy                         usr lib python3 dist-packages numpy core include  ver 1 8 2  --     packages path                 usr lib python3 dist-packages --  --   Python  for build           And with virtualenv used the following cmake options   cmake -D CMAKE BUILD TYPE RELEASE   -D CMAKE INSTALL PREFIX  VIRTUAL ENV   -D PYTHON3 EXECUTABLE  VIRTUAL ENV bin python3   -D PYTHON3 PACKAGES PATH  VIRTUAL ENV lib python3 4 site-packages   -D PYTHON3 LIBRARY  usr lib x86 64-linux-gnu libpython3 4m so   -D PYTHON3 INCLUDE DIR  VIRTUAL ENV include python3 4m   -D PYTHON INCLUDE DIR  VIRTUAL ENV include python3 4m   -D PYTHON3 INCLUDE DIRS  VIRTUAL ENV include python3 4m   -D PYTHON INCLUDE DIRS  VIRTUAL ENV include python3 4m   -D BUILD opencv python3 ON       If you have issues with ffmpeg includes add the following to remove video support   -D WITH FFMPEG OFF   -D WITH GSTREAMER OFF   -D WITH V4L OFF   -D WITH 1394 OFF     Also take heed of the warning from cmake about using make clean  If you ran make clean you might have to uncompress the original package anew  Cmake is dead  long live the Cmake

User · Answer

I know this is an old thread  but just in case anyone is looking  here is how I got it working on El Capitan   brew install opencv3 --with-python3  and wait a while for it to finish   Then run the following as necessary   brew unlink opencv  Then run the following as the final step   brew ln opencv3 --force  Now you should be able to run import cv2 no problem in a python 3 x script

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You can use the following command on the command prompt  cmd  on Windows   py -3 3 -m pip install opencv-python   I made a video on how to install OpenCV Python on Windows in 1 minute here   https   www youtube com watch v m2-8SHk-1SM  Hope it helps

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For Ubuntu - pip3 install opencv-python sudo apt-get install python3-opencv

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Use the pip application  On windows you find it in Python3 Scripts pip exe and On Ubuntu you can install with apt-get install python3-pip  and so  use the command line   pip3 install --upgrade pip  pip3 install opencv-python  On Windows use only pip exe instead pip3

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I can t comment on midopa s excellent answer due to lack of reputation   On a Mac I  finally  successfully installed opencv from source using the following commands   cmake -D CMAKE BUILD TYPE RELEASE  -D CMAKE INSTALL PREFIX  usr local  -D PYTHON EXECUTABLE  Library Frameworks Python framework Versions 3 4 bin python3  -D PYTHON LIBRARY  Library Frameworks Python framework  Versions 3 4 lib libpython3 4m dylib  -D PYTHON INCLUDE DIR  Library Frameworks Python framework Versions 3 4 include python3 4m  -D PYTHON NUMPY INCLUDE DIRS  Library Frameworks Python framework Versions 3 4 lib python3 4 site-packages numpy core include numpy  -D PYTHON PACKAGES PATH  Library Frameworks Python framework Versions 3 4 lib python3 4 site-packages   relative path to source directory    Then   make -j8   change 8 for the number of threads your machine can handle  to speed things up  sudo make install   I added a PYTHONPATH environment variable to my    bash profile file so that Python could find cv2 so   PYTHONPATH    PYTHONPATH   usr local lib python3 4 site-packages    export PYTHONPATH    For those using PyCharm  I had to go to Preferences   Project Structure   Add Content Root  and added the path to cv2 so s parent directory   usr local lib python3 4 site-packages   This command got me past errors such as   Could NOT find PythonLibs  by explicitly declaring the python library path  ld  can t link with a main executable for architecture x86 64 collect2  error  ld returned 1 exit status make 2        lib cv2 so  Error 1 make 1        modules python2 CMakeFiles opencv python2 dir all  Error 2 make       all  Error 2   by explicitly pointing to the libpython3 4m dylib  In terminal  check that it worked with    python3  gt  gt  gt  import cv2   It s all good if you don t get ImportError  No module named  cv2   This worked on a Macbook Pro Retina 15  2013  Mavericks 10 9 4  Python 3 4 1  previously installed from official download   opencv3 from source  Hope that this helps someone

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I had a lot of trouble getting opencv 3 0 to work on OSX with python3 bindings and virtual environments  The other answers helped a lot  but it still took a bit  Hopefully this will help the next person   Save this to build opencv sh  Then download opencv  modify the variables in the below shell script  cross your fingers  and run it      build opencv sh    For debugging  use the other posts  especially James Fletchers   Don t forget to add the opencv lib dir to your PYTHONPATH   Note - this also downloads opencv-contrib  where many of the functions have been moved  And they are also now referenced by a different namespace than the documentation - for instance SIFT is now under cv2 xfeatures2d SIFT create  Uggh      bin bash   Install opencv with python3 bindings  https   stackoverflow com questions 20953273 install-opencv-for-python-3-3 21212023 21212023    First download opencv and put in OPENCV DIR      Edit this section   PYTHON DIR  Library Frameworks Python framework Versions 3 4 OPENCV DIR  usr local Cellar opencv 3 0 0 NUM THREADS 8 CONTRIB TAG  3 0 0     This will also download opencv contrib and checkout the appropriate tag https   github com Itseez opencv contrib       Run it    set -e    Exit if error  cd   OPENCV DIR   if       -d opencv contrib    then     echo    Get contrib modules         -d opencv contrib       mkdir opencv contrib     git clone git github com Itseez opencv contrib git       git checkout   CONTRIB TAG  else     echo    Contrib directory already exists  Not fetching   fi  cd   OPENCV DIR   echo    Going to do  cmake  cmake -D CMAKE BUILD TYPE RELEASE       -D CMAKE INSTALL PREFIX  usr local       -D PYTHON EXECUTABLE   PYTHON DIR  bin python3       -D PYTHON LIBRARY   PYTHON DIR  lib libpython3 4m dylib       -D PYTHON INCLUDE DIR   PYTHON DIR  include python3 4m       -D PYTHON NUMPY INCLUDE DIRS   PYTHON DIR  lib python3 4 site-packages numpy core include numpy       -D PYTHON PACKAGES PATH   PYTHON DIR lib python3 4 site-packages       -D OPENCV EXTRA MODULES PATH opencv contrib modules       -D BUILD opencv legacy OFF          OPENCV DIR    echo    Going to do  make  make -j  NUM THREADS   echo    Going to do  make install  sudo make  install  echo    Add the following to your  bashrc  export PYTHONPATH   PYTHONPATH    OPENCV DIR  lib  export PYTHONPATH   PYTHONPATH    OPENCV DIR  lib  echo    Testing if it worked  python3 -c  import cv2  echo  opencv properly installed with python3 bindings      The script will exit if the above failed

User · Answer

Yes support for Python 3 it is still not available in current version  but it will be available from version 3 0   see this ticket   If you really want to have python 3 try using development version  you can download it from GitHub   EDIT  18 07 2015    version 3 0 is now released and python 3 support is now officially available

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Someone has published a docker container   file for this   https   github com vipul-sharma20 docker-opencv3-python3  https   hub docker com r vipul20 docker-opencv3-python3   dockerfile   You can pull the image directly from docker hub or follow the instructions in the Dockerfile to install

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Just in case you found that pip3 install opencv-python takes too long for you  you can set number of build threads  export MAKEFLAGS  quot -j8 quot  pip3 install opencv-python --no-cache-dir   --no-cache-dir will ignore previous build

User · Answer

EDIT  first try the new pip method    Windows  pip3 install opencv-python opencv-contrib-python  Ubuntu  sudo apt install python3-opencv   or continue below for build instructions  Note  The original question was asking for OpenCV   Python 3 3   Windows  Since then  Python 3 5 has been released  In addition  I use Ubuntu for most development so this answer will focus on that setup  unfortunately  OpenCV 3 1 0   Python 3 5 2   Ubuntu 16 04 is possible  Here s how   These steps are copied  and slightly modified  from    http   docs opencv org 3 1 0 d7 d9f tutorial linux install html https   opencv-python-tutroals readthedocs io en latest py tutorials py setup py setup in fedora py setup in fedora html install-opencv-python-in-fedora   Prerequisites  Install the required dependencies and optionally install update some libraries on your system     Required dependencies sudo apt install build-essential cmake git libgtk2 0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev   Dependencies for Python bindings   If you use a non-system copy of Python  eg  with pyenv or virtualenv   then you probably don t need to do this part sudo apt install python3 5-dev libpython3-dev python3-numpy   Optional  but installing these will ensure you have the latest versions compiled with OpenCV sudo apt install libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev   Building OpenCV  CMake Flags  There are several flags and options to tweak your build of OpenCV  There might be comprehensive documentation about them  but here are some interesting flags that may be of use  They should be included in the cmake command     Builds in TBB  a threading library -D WITH TBB ON   Builds in Eigen  a linear algebra library -D WITH EIGEN ON   Using non-system level Python versions  If you have multiple versions of Python  eg  from using pyenv or virtualenv   then you may want to build against a certain Python version  By default OpenCV will build for the system s version of Python  You can change this by adding these arguments to the cmake command seen later in the script  Actual values will depend on your setup  I use pyenv   -D PYTHON DEFAULT EXECUTABLE  HOME  pyenv versions 3 5 2 bin python3 5 -D PYTHON INCLUDE DIRS  HOME  pyenv versions 3 5 2 include python3 5m -D PYTHON EXECUTABLE  HOME  pyenv versions 3 5 2 bin python3 5 -D PYTHON LIBRARY  usr lib x86 64-linux-gnu libpython3 5m so 1   CMake Python error messages  The CMakeLists file will try to detect various versions of Python to build for  If you ve got different versions here  it might get confused  The above arguments may only  fix  the issue for one version of Python but not the other  If you only care about that specific version  then there s nothing else to worry about   This is the case for me so unfortunately  I haven t looked into how to resolve the issues with other Python versions   Install script    Clone OpenCV somewhere   I ll put it into  HOME code opencv OPENCV DIR   HOME code opencv  OPENCV VER  3 1 0  git clone https   github com opencv opencv   OPENCV DIR    This ll take a while       Now lets checkout the specific version we want cd   OPENCV DIR  git checkout   OPENCV VER     First OpenCV will generate the files needed to do the actual build    We ll put them in an output directory  in this case  release  mkdir release cd release    Note  This is where you d add build options  like TBB support or custom Python versions  See above sections  cmake -D CMAKE BUILD TYPE RELEASE -D CMAKE INSTALL PREFIX  usr local   OPENCV DIR     At this point  take a look at the console output    OpenCV will print a report of modules and features that it can and can t support based on your system and installed libraries    The key here is to make sure it s not missing anything you ll need    If something s missing  then you ll need to install those dependencies and rerun the cmake command     OK  lets actually build this thing    Note  You can use the  make -jN  command  which will run N parallel jobs to speed up your build  Set N to whatever your machine can handle  usually  lt   the number of concurrent threads your CPU can run   make   This will also take a while       Now install the binaries  sudo make install   By default  the install script will put the Python bindings in some system location  even if you ve specified a custom version of Python to use  The fix is simple  Put a symlink to the bindings in your local site-packages   ln -s  usr local lib python3 5 site-packages cv2 cpython-35m-x86 64-linux-gnu so  HOME  pyenv versions 3 5 2 lib python3 5 site-packages    The first path will depend on the Python version you setup to build  The second depends on where your custom version of Python is located   Test it   OK lets try it out   ipython  Python 3 5 2  default  Sep 24 2016  13 13 17   Type  copyright    credits  or  license  for more information   IPython 5 1 0 -- An enhanced Interactive Python            - gt  Introduction and overview of IPython s features   quickref - gt  Quick reference  help      - gt  Python s own help system  object    - gt  Details about  object   use  object    for extra details   In  1   import cv2  In  2   img   cv2 imread  derp png   i In  3   img 0  Out 3    array   26  30  31           27  31  32           27  31  32                        16  19  20           16  19  20           16  19  20    dtype uint8

User · Answer

Whether or not you install opencv3 manually or from Gohlke s whl package  I found the need to create edit the file cv py in site packages as follows to make compatable with old code   import cv2 as cv

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Here a solution for  I believe as seen by  cp34  on the link below  Python 3 4   Go to to http   www lfd uci edu  gohlke pythonlibs  opencv   Download the appropriate  whl   Go to the directory where the  whl is saved   Use pip to install the  whl   e g  pip install opencv python-3 0 0-cp34-none-win amd64 whl  Then just use import cv2

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