ubuntu20.04安装opencv3.4.1

Ubuntu 20.04 上安装 OpenCV 3.4.1 的步骤如下：

1. 安装依赖：

sudo apt update
sudo apt upgrade
sudo apt install build-essential cmake unzip pkg-config libjpeg-dev libpng-dev libtiff-dev libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev libgtk-3-dev libatlas-base-dev gfortran python3-dev

2. 下载 OpenCV 源码：

wget -O opencv.zip https://github.com/opencv/opencv/archive/3.4.1.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/3.4.1.zip
unzip opencv.zip
unzip opencv_contrib.zip

3. 编译并安装 OpenCV：

cd opencv-3.4.1
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D INSTALL_C_EXAMPLES=OFF \
    -D OPENCV_ENABLE_NONFREE=ON \
    -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-3.4.1/modules \
    -D PYTHON_EXECUTABLE=$(which python3) \
    -D BUILD_EXAMPLES=ON ..
make -j4
sudo make install
sudo ldconfig

4. 验证安装：

python3
>>> import cv2
>>> print(cv2.__version__)

如果输出了 "3.4.1"，则说明安装成功。