ubuntu下安装opencv4.6.0,安装后测试opencv

好的，安装OpenCV 4.6.0的步骤如下：

1. 更新包管理器:

   sudo apt update

2. 安装依赖项:

   sudo apt install build-essential cmake git pkg-config libgtk-3-dev \
    libavcodec-dev libavformat-dev libswscale-dev libv4l-dev \
    libxvidcore-dev libx264-dev libjpeg-dev libpng-dev libtiff-dev \
    gfortran openexr libatlas-base-dev python3-dev python3-numpy \
    libtbb2 libtbb-dev libdc1394-22-dev libopenexr-dev \
    libgstreamer-plugins-base1.0-dev libgstreamer1.0-dev

3. 克隆OpenCV仓库:

   git clone https://github.com/opencv/opencv.git
   cd opencv
   git checkout 4.6.0

4. 创建并进入build目录:

   cd ..
   mkdir build
   cd build

5. 配置OpenCV:

   cmake -D CMAKE_BUILD_TYPE=RELEASE \
         -D CMAKE_INSTALL_PREFIX=/usr/local \
         -D WITH_CUDA=OFF \
         -D WITH_CUDNN=OFF \
         -D OPENCV_DNN_CUDA=OFF \
         -D BUILD_opencv_python3=ON \
         -D OPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules \
         -D BUILD_EXAMPLES=ON ..

6. 编译和安装:

   make -j$(nproc)
   sudo make install
   sudo ldconfig

7. 测试OpenCV:

   cd ~/opencv/samples/cpp/
   g++ `pkg-config --cflags --libs opencv4` facedetect.cpp -o facedetect
   ./facedetect --face_cascade=../../data/haarcascades/haarcascade_frontalface_alt.xml --scale=1.3 lena.jpg

如果一切正常，你应该可以看到lena.jpg中的脸部被检测到了。

希望这可以帮助到你。