uechi.io/_posts/2017-03-23-install-opencv3-and-python3-bindings.markdown

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---
title: Definitive Guide to Install OpenCV 3 and its Python 3 bindings
date: 2017-03-23 15:10:00 +09:00
redirect_from: /blog/2017/03/23/install-opencv3-and-python3-bindings
---
This article describes how to install OpenCV 3 and its Python 3 bindings on macOS and Ubuntu.
## `pyenv` users beware
Make sure to use system python because there is some tricky problem with OpenCV 3 install script.
To switch to system python, run `pyenv global system`.
# macOS
Install OpenCV 3 package from `homebrew/science`, make sure to add `--with-python3` so we'll also get its Python 3 bindings simultaneously.
```bash
brew tap homebrew/science
brew install opencv3 --with-python3
```
After installing OpenCV 3, put OpenCV 3 path file as `opencv3.pth` into brewed-`python3` site-packages directory, which indicates where the OpenCV 3 bindings installed.
```bash
echo /usr/local/opt/opencv3/lib/python3.6/site-packages >> /usr/local/lib/python3.6/site-packages/opencv3.pth
```
# Ubuntu
```bash
git clone https://github.com/opencv/opencv
cd opencv
git checkout 3.2.0
mkdir build
cd build
cmake \
-D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D WITH_TBB=ON \
-D WITH_EIGEN=ON \
-D BUILD_NEW_PYTHON_SUPPORT=ON \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D WITH_V4L=ON \
-D WITH_FFMPEG=OFF \
-D BUILD_EXAMPLES=OFF \
-D BUILD_TESTS=OFF \
-D BUILD_PERF_TESTS=OFF \
-D BUILD_DOCS=OFF \
-D BUILD_opencv_python2=OFF \
-D BUILD_opencv_python3=ON \
-D BUILD_opencv_video=OFF \
-D BUILD_opencv_videoio=OFF \
-D BUILD_opencv_videostab=OFF \
-D PYTHON_EXECUTABLE=$(which python) \
"$OPENCV_DIR"
make -j2
sudo make install
pip install opencv-python
```
# Check install
```
python -c "import cv2;print(cv2.__version__)"
```
and you'll got `3.2.0`.