在MAC上安装OpenCV Python

1.进入~目录
cd ~
2.安装homebrew（已安装可省略这一步）

ruby -e"$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

3.更新homebrew

brew update

4.安装python（已安装可省略）
brew install python
5.在家目录下打开 .bash_profile加入以下代码，配置环境变量（如果不配置，python会执行OS自带的目录下的numpy包）:

export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python2.7/site-packages  

6.将环境变量加入
source ~/.bash_profile
7.将science加入homebrew下（必须执行这步才能安装opencv!)
brew tap homebrew/science
8.安装opencv

brew info opencv
brew install opencv

9.查看环境变量是否正确加入(opencv的版本注意改成你下载的版本，我这里是2.4.12_2)

cd /usr/local/Cellar/opencv/2.4.12_2
cat ~/.bash_profile | grep PYTHONPATH

10.将opencv包链接到python的上下文中

cd /usr/local/lib/python2.7/site-packages
ln -s /usr/local/Cellar/opencv/2.4.12_2/lib/python2.7/site-packages/cv.py cv.py
ln -s /usr/local/Cellar/opencv/2.4.12_2/lib/python2.7/site-packages/cv2.so cv2.so