macOSにhomebrew経由でPython3用OpenCV3がインストールできないとき、先にnumpyをインストールしておくと上手くいく(かもしれない)。
- macOS Sierra(10.12.3)
- Python 3.6.0
- OpenCV 3.2.0(-dev)
$ brew install numpy --with-python3
$ brew tap homebrew/science
$ brew install opencv3 --with-contrib --with-python3 --without-python --HEAD
$ echo "/usr/local/opt/opencv3/lib/python3.6/site-packages/" \
> /usr/local/lib/python3.6/site-packages/opencv3.pth