CentOS7.8 安装 OpenCV

文章目录

• • • 一、安装依赖
    • 二、安装OpenCV

一、安装依赖

系统依赖：

sudo yum -y install epel-release
sudo yum -y install gcc gcc-c++
sudo yum -y install cmake cmake3
sudo yum -y install autoconf automake bzip2 bzip2-devel cmake freetype-devel gcc gcc-c++ git libtool make mercurial pkgconfig zlib-devel
sudo yum -y install python-devel numpy gtk2-devel libdc1394-devel libv4l-devel gstreamer-plugins-base-devel

安装：FFmpeg（在线安装）：

sudo su          # 使用超级权限
rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro
rpm -Uvh http://li.nux.ro/download/nux/dextop/el7/x86_64/nux-dextop-release-0-1.el7.nux.noarch.rpm
yum -y install ffmpeg ffmpeg-devel
ffmpeg           # 查看安装情况

安装参考：https://linoxide.com/linux-how-to/install-ffmpeg-centos-7/
或者参考：https://commandnotfound.cn/linux/1/171/ffmpeg-%E5%91%BD%E4%BB%A4

安装：FFmpeg（离线安装）：https://www.cnblogs.com/blackhumour2018/p/9431393.html

二、安装OpenCV

2.1 下载安装

OpenCV官网下载：https://opencv.org/releases.html
或者命令下载：wget https://github.com/opencv/opencv/archive/3.4.4.zip
安装位置：path/to /install，根据自己路径设置。不指定时，默认安装路径在 /usr/local/

unzip opencv-3.4.12.zip
cd opencv-3.4.12
mkdir build && cd build

cmake -D CMAKE_BUILD_TYPE=RELEASE \
    -D CMAKE_INSTALL_PREFIX=/usr/local \
    -D INSTALL_C_EXAMPLES=ON \
    -D INSTALL_PYTHON_EXAMPLES=ON \
    -D OPENCV_GENERATE_PKGCONFIG=ON \
    -D BUILD_EXAMPLES=ON ..
'''
-- Configuring done
-- Generating done
-- Build files have been written to: /home/`username`/opencv-3.4.12/build
 
'''

make -j$(nproc)			#有几个CPU就用几个CPU
sudo make install

2.2 配置OpenCV

1. 添加库路径–执行：
   sudo ln -s /usr/local/lib64/pkgconfig/opencv.pc /usr/share/pkgconfig/
sudo ldconfig

2. 添加环境变量：
   sudo vi /etc/profile　　　　　打开此文件，在文件末尾另起行加入如下两行：（保存，退出）
   export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib64/pkgconfig
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib64
source /etc/profile　　　　　立即生效

3. pkg-config配置
   默认的pkg搜索链接路径/usr/lib/pkgconfig，需要将opencv.pc拷贝到pkg的默认路径下
   cp /usr/local/lib64/pkgconfig/opencv.pc /usr/lib/pkgconfig

4. 测试

   cd samples/cpp/example_cmake/
   make
   
   '''
   g++ example.cpp -o example.o -c -Wall -I/usr/local/include/opencv -I/usr/local/include
   g++ example.o -o opencv_example -L/usr/local/lib64 -lopencv_dnn -lopencv_highgui -lopencv_ml -lopencv_objdetect -lopencv_shape -lopencv_stitching -lopencv_superres -lopencv_videostab -lopencv_calib3d -lopencv_videoio -lopencv_imgcodecs -lopencv_features2d -lopencv_video -lopencv_photo -lopencv_imgproc -lopencv_flann -lopencv_core -ldl -lm -lpthread -lrt
   
   '''
   ./opencv_example         # 执行生成的程序
   Built with OpenCV 3.4.1   # 在这里会卡一阵
   

参考：
https://lvjianzhao.gitee.io/lvjianzhao/2020/07/03/Centos%207.6%E5%AE%89%E8%A3%85opencv/
https://linuxize.com/post/how-to-install-opencv-on-centos-8/

https://blog.csdn.net/whudee/article/details/93379780
https://blog.csdn.net/weixin_43470000/article/details/84962432