在树莓派上更新opencv

在树莓派上更新 OpenCV 可以采取以下步骤：

1. 更新系统软件包，确保树莓派上的所有软件都是最新的：

   sudo apt-get update
   sudo apt-get upgrade

2. 安装必要的依赖：

   sudo apt-get install build-essential cmake pkg-config
   sudo apt-get install libjpeg-dev libtiff5-dev libjasper-dev libpng-dev libwebp-dev libopenexr-dev
   sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev libdc1394-22-dev libgstreamer-plugins-base1.0-dev libgstreamer1.0-dev
   sudo apt-get install libgtk-3-dev libqtgui4 libqtwebkit4 libqt4-test python3-pyqt5
   sudo apt-get install libatlas-base-dev liblapacke-dev gfortran

3. 下载 OpenCV 源代码：

   wget -O opencv.zip https://github.com/opencv/opencv/archive/4.5.2.zip
   wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.5.2.zip
   unzip opencv.zip
   unzip opencv_contrib.zip

4. 编译并安装 OpenCV：

   cd opencv-4.5.2
   mkdir build
   cd build
   cmake -D CMAKE_BUILD_TYPE=RELEASE \
         -D CMAKE_INSTALL_PREFIX=/usr/local \
         -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-4.5.2/modules \
         -D ENABLE_NEON=ON \
         -D ENABLE_VFPV3=ON \
         -D BUILD_TESTS=OFF \
         -D INSTALL_PYTHON_EXAMPLES=OFF \
         -D OPENCV_ENABLE_NONFREE=ON ..
   make -j4
   sudo make install
   sudo ldconfig

5. 检查 OpenCV 是否安装成功：

   pkg-config --modversion opencv4

如果成功安装，则会显示 OpenCV 的版本号。