(1)到https://github.com/opencv/opencv下载opencv4.5.1，解压得到opencv-master
(2)安装依赖包
sudo apt-get install build-essential cmake unzip pkg-config
sudo apt-get install libjpeg-dev libpng-dev libtiff-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
sudo apt-get install python3-dev
(3)创建工作文件夹并编译安装
cd opencv-master
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D OPENCV_GENERATE_PKGCONFIG=YES -D WITH_1394=OFF …
make -j8
sudo make install
(4)设置环境变量
sudo vim /etc/ld.so.conf.d/opencv.conf
创建的文件中加入 /usr/local/lib，然后
sudo ldconfig
(5)
测试
cd ~/下载/opencv/samples/cpp/example_cmake
cmake .
make
./opencv_example
如果没有摄像头将capture.open(0)改为capture.open(". ./. ./data/tree.avi")
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