feat: use hexo

source/_posts/2017/2017-03-23-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`.