ubuntu 安装OpenCV3.4

安装 OpenCV3.4 可以按照以下步骤进行：

1. 安装依赖项

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install build-essential cmake git pkg-config
sudo apt-get install libjpeg8-dev libtiff5-dev libjasper-dev libpng12-dev
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
sudo apt-get install libxvidcore-dev libx264-dev
sudo apt-get install libgtk-3-dev
sudo apt-get install libatlas-base-dev gfortran

2. 下载 OpenCV 源代码

cd ~
git clone https://github.com/opencv/opencv.git
cd opencv
git checkout 3.4.0

3. 编译并安装 OpenCV

mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D INSTALL_C_EXAMPLES=OFF \
    -D OPENCV_ENABLE_NONFREE=ON \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D PYTHON_EXECUTABLE=/usr/bin/python2.7 \
    -D BUILD_EXAMPLES=ON ..
make -j4
sudo make install