Centos7 安装 OpenCV 3.4.9

1. 配置好epel源

yum -y install epel-release

yum install gcc gcc-c++  

yum install cmake  

yum install python-devel numpy

yum -y install vim mlocate

2. 源码编译安装

百度网盘下载 Opencv 3.4.9 提取码：a0wt

tar xf OpenCV3.4.9.tar.gz

cd opencv-opencv-f990054

mkdir build

cd build

cmake -D WITH_TBB=ON -D WITH_EIGEN=ON ..

cmake -D BUILD_DOCS=ON -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_EXAMPLES=OFF .. cmake -D WITH_OPENCL=OFF -D WITH_CUDA=OFF -D BUILD_opencv_gpu=OFF -D BUILD_opencv_gpuarithm=OFF -D BUILD_opencv_gpubgsegm=OFF -D BUILD_opencv_gpucodec=OFF -D BUILD_opencv_gpufeatures2d=OFF -D BUILD_opencv_gpufilters=OFF -D BUILD_opencv_gpuimgproc=OFF -D BUILD_opencv_gpulegacy=OFF -D BUILD_opencv_gpuoptflow=OFF -D BUILD_opencv_gpustereo=OFF -D BUILD_opencv_gpuwarping=OFF ..

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..

make

make install

3. opencv配置与加载动态库

cd /etc/ld.so.conf.d

# 添加opencv编译产生的lib库路径到opencv.conf中 

/bin/bash -c 'echo "/usr/local/lib64" > /etc/ld.so.conf.d/opencv.conf'

加载 ldconfig

ldconfig 

添加PATH

vim /etc/bashrc

在文件末尾另起行加入

PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib64/pkgconfig

export PKG_CONFIG_PATH

保存，退出后重新加载配置文件

source /etc/bashrc

更新数据库

updatedb

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

mkdir /usr/lib/pkgconfig

cp /usr/local/lib64/pkgconfig/opencv.pc /usr/lib/pkgconfig/

4.opencv测试

cd opencv/samples/cpp/example_cmake

make

./opencv_example

有界面的话会有弹框，我这无界面会有如下提示

Built with OpenCV 3.4.9

[ WARN:0] VIDEOIO(V4L2:/dev/video0): can't open camera by index

No capture