1，下载好opencv 以及 opencv contrib 文件
sudo apt-get install build-essential
sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev # 处理图像所需的包
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev liblapacke-dev
sudo apt-get install libxvidcore-dev libx264-dev # 处理视频所需的包
sudo apt-get install libatlas-base-dev gfortran # 优化opencv功能
sudo apt-get install ffmpeg
安装命令：
cd opencv-3.2.0
mkdir build
cmake -D WITH_CUDA=OFF -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local OPENCV_EXTRA_MODULES_PATH=
/home/hanxuan/opencv-3.2.0/opencv3.2.0/opencv_contrib-3.2.0/modules/ ..
make -j4
make install
有两个文件无法直接下载，需要我们手动下载。
最后，输入：
pip3 install opencv-python
错误
如果出现编译问题“undefined reference to `cblas_sgemm(CBLAS_ORDER, CBLAS_TRANSPOSE, CBLAS_TRANSPOSE, int, int, int, float, float const, int, float const, int, float, float*, int)'”
可能需要重新编译BLAS，CBLAS，LPACK。（我的另外一篇文章）然后再重新安装：
sudo apt-get install libatlas-base-dev gfortran
再编译就行。
