Install opencv3 for python3 on mac

README.md

Summary of installation

based on pyimagesearch tutorial

• install XCode, homebrew
• install python3:
  • brew install python3
  • brew linkapps python3
• if existing virtual environment is installed, activate it
• else activate new virtualenv cv (using virtualenvwrapper):
  • pip install virtualenv virtualenvwrapper
  • echo "export WORKON_HOME=~/.virtualenvs" >> ~/.bash_profile
  • echo "source /usr/local/bin/virtualenvwrapper.sh" >> ~/.bash_profile
  • . ~/.bash_profile
  • mkvirtualenv cv -p python3
  • workon cv
• install opencv requirements:
  • pip install numpy
  • brew install cmake pkg-config jpeg libpng libtiff openexr eigen tbb
• download opencv3 from github source:
  • cd ~
  • git clone https://github.com/opencv/opencv
  • git clone https://github.com/opencv/opencv_contrib
• compile and build the source
  • cd ~/opencv && mkdir build-test && cd $_

  •   PY3LIB=$(ls -t /usr/local/Cellar/python3/3.*.*/Frameworks/Python.framework/Versions/3.*/lib/python3.*/config-3.*m*/libpython3.*[0-9].dylib | head -1)
      PY3INCLDIR=$(ls -td /usr/local/Cellar/python3/3.*.*/Frameworks/Python.framework/Versions/3.*/include/python3.*m/ | head -1)
    
      cmake -D CMAKE_BUILD_TYPE=RELEASE \
      -D CMAKE_INSTALL_PREFIX=/usr/local \
      -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \
      -D PYTHON3_LIBRARY=$PY3LIB \
      -D PYTHON3_INCLUDE_DIR=$PY3INCLDIR \
      -D PYTHON3_EXECUTABLE=$VIRTUAL_ENV/bin/python \
      -D BUILD_opencv_python2=OFF \
      -D BUILD_opencv_python3=ON \
      -D INSTALL_PYTHON_EXAMPLES=ON \
      -D INSTALL_C_EXAMPLES=OFF \
      -D BUILD_EXAMPLES=ON ..

  • check the cmake output for errors
  • make -j4
  • sudo make install
• rename and sym-link your OpenCV 3 + Python 3.5 bindings

  •   PY3LOCALPACKAGES=$(ls -td /usr/local/lib/python3.*/site-packages | head -1)
      cd $PY3LOCALPACKAGES
      PY3CVSO=$(ls *.so | head -1)
      mv $PY3CVSO cv2.so 
      PY3VENVPACKAGES=$(ls -d $VIRTUAL_ENV/lib/python3.*/site-packages | head -1)
      cd $PY3VENVPACKAGES
      ln -s $PY3LOCALPACKAGES/cv2.so cv2.so

install-cv2-mac.sh

# based on pyimagesearch tutorial
# http://www.pyimagesearch.com/2016/12/05/macos-install-opencv-3-and-python-3-5/

echo "~ Installing and linking python3 ~"
brew install python3
brew linkapps python3

echo "~ Installing virtualenv wrapper ~"
pip install virtualenv virtualenvwrapper
echo "export WORKON_HOME=~/.virtualenvs" >> ~/.bash_profile
echo "source /usr/local/bin/virtualenvwrapper.sh" >> ~/.bash_profile
source ~/.bash_profile
if [ $# -eq 0 ]
    VENVNAME=cv
else
    VENVNAME=$1
fi
mkvirtualenv $VENVNAME -p python3
workon $VENVNAME

echo "~ Using virtual env: $VENVNAME ~"
cd ~
git clone https://github.com/opencv/opencv
git clone https://github.com/opencv/opencv_contrib
cd ~/opencv && mkdir build-test && cd $_

echo "~ Compiling from souce file ~"
PY3LIB=$(ls -t /usr/local/Cellar/python3/3.*.*/Frameworks/Python.framework/Versions/3.*/lib/python3.*/config-3.*m*/libpython3.*[0-9].dylib | head -1)
PY3INCLDIR=$(ls -td /usr/local/Cellar/python3/3.*.*/Frameworks/Python.framework/Versions/3.*/include/python3.*m/ | head -1)

cmake -D CMAKE_BUILD_TYPE=RELEASE \
      -D CMAKE_INSTALL_PREFIX=/usr/local \
      -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \
      -D PYTHON3_LIBRARY=$PY3LIB \
      -D PYTHON3_INCLUDE_DIR=$PY3INCLDIR \
      -D PYTHON3_EXECUTABLE=$VIRTUAL_ENV/bin/python \
      -D BUILD_opencv_python2=OFF \
      -D BUILD_opencv_python3=ON \
      -D INSTALL_PYTHON_EXAMPLES=ON \
      -D INSTALL_C_EXAMPLES=OFF \
      -D BUILD_EXAMPLES=ON ..

echo "~ Building from souce file ~"
make -j4
sudo make install

PY3LOCALPACKAGES=$(ls -td /usr/local/lib/python3.*/site-packages | head -1)
cd $PY3LOCALPACKAGES
PY3CVSO=$(ls *.so | head -1)
mv $PY3CVSO cv2.so 
PY3VENVPACKAGES=$(ls -d $VIRTUAL_ENV/lib/python3.*/site-packages | head -1)
cd $PY3VENVPACKAGES
ln -s $PY3LOCALPACKAGES/cv2.so cv2.so