ubuntu16.04 安装opencv3.4.3以及opencv_contrib（命令行形式）

通过命令行下载opencv文件：
git clone https://github.com/Itseez/opencv.git
git clone https://github.com/Itseez/opencv_contrib.git

安装依赖项：

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

将opencv_contrib移到opencv文件夹，并在opencv文件夹创建build：mkdir build

进入build文件夹进行编译：

cmake -D CMAKE_INSTALL_PREFIX=/usr/local -D CMAKE_BUILD_TYPE=Release -D OPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules ..

然后是更加漫长的编译过程：

make -j8

sudo make install

至此安装结束

测试opencv：

进入samples：

编译：cmake .

make

./opencv_example