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ubuntu下面编译opencv, 有坑，记录一下.

根据官方教程编译，坑少一点。

  1. 教程地址: https://docs.opencv.org/4.x/d7/d9f/tutorial_linux_install.html
  2. 下载opencv: wget -O opencv.zip https://github.com/opencv/opencv/archive/4.x.zip
  3. 下载扩展包, opencv contrib: wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.x.zip
  4. 解压并配置目录: 
    	unzip opencv.zip
 unzip opencv_contrib.zip
 # Create build directory and switch into it
 mkdir -p build && cd build
  5. 配置: cmake -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib-4.5.5/modules -D BUILD_opencv_python=OFF -D OPENCV_ENABLE_NONFREE=ON ../opencv-4.5.5
    1. DOPENCV_EXTRA_MODULES_PATH, 编译扩展包。没有扩展包很多功能用不了。
    2. BUILD_opencv_python=OFF, 关闭python extension. 在ubuntu下python extension总是编译不过。先跳过。
    3. OPENCV_ENABLE_NONFREE=ON, 下载编译专利算法包。要不然surf算法用不了。
  6. 编译: make -j8, 8线程编译.
  7. 安装: sudo make install