ubuntu16.04安装OpenCV
安装opencv：
1、查看OpenCV版本
2、安装
sudo apt install libopencv-dev
3、安装pip3
4、分别给python2和python3的环境安装opencv
sudo pip3 install opencv-python
5、安装验证
sudo pip3 install opencv-python
sudo pip3 install opencv-python
sudo pip3 install opencv-python