下载地址：https://github.com/opencv/opencv/archive/3.4.14.zip
1： 解压 ./opencv-source 2: cd ./opencv-source 3: mkdir build 4: cd build 5：cmake .. 6: make 7: make install
安装完成后默认没有face模块 扩展模块构建： 下载地址 https://github.com/opencv/opencv_contrib/archive/refs/tags/3.4.14.tar.gz
1：解压 tar -xzf .. ./opencv_contrib 2: cd ./opencv-source/build 3: cmake -DOPENCV_EXTRA_MODULES_PATH=<opencv_contrib_dir>/modules/face .. 4: make 5: make install