centos7 cmake编译opencv+protobuf+ncnn

1、opencv编译

　　下载网址：Tags · opencv/opencv (github.com)

　　我下载的opencv-3.4.15

　　centos 终端输入：su 获取root权限；(以下所有命令皆在root权限下）

　　-安装所需（参考：(27条消息) CentOS 里安装 OpenCV_whudee的博客-CSDN博客_centos opencv）：

sudo yum -y install epel-release			# 安装epel扩展源
sudo yum -y install git gcc gcc-c++ cmake3
sudo yum -y install qt5-qtbase-devel
sudo yum install -y python36 python36-devel python36-pip
sudo yum install -y python python-devel python-pip
sudo yum -y install python-devel numpy python36-numpy
sudo yum -y install gtk2-devel
sudo yum install -y libpng-devel
sudo yum install -y jasper-devel
sudo yum install -y openexr-devel
sudo yum install -y libwebp-devel
sudo yum -y install libjpeg-turbo-devel 
sudo yum install -y freeglut-devel mesa-libGL mesa-libGL-devel
sudo yum -y install libtiff-devel 
sudo yum -y install libdc1394-devel
sudo yum -y install tbb-devel eigen3-devel
sudo yum -y install boost boost-thread boost-devel
sudo yum -y install libv4l-devel
sudo yum -y install gstreamer-plugins-base-devel

#=========== 安装 ffmpeg ===========
yum localinstall --nogpgcheck https://download1.rpmfusion.org/free/el/rpmfusion-free-release-7.noarch.rpm  https://download1.rpmfusion.org/nonfree/el/rpmfusion-nonfree-release-7.noarch.rpm
(可选) rpm --import http://li.nux.ro/download/nux/RPM-GPG-KEY-nux.ro
(可选) 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	# 安装ffmpeg依赖

　　第一次安装编译没安装上面的依赖库，也编译过去了，但是后面运行程序时出错了，所以还是老老实实安装这一坨吧。

　　-正式安装opencv

cd opencv-3.4.15
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local .
make
make install

2、ncnn编译

    2.1 protobuf编译

    下载网址：Tags · protocolbuffers/protobuf (github.com)

    我下载的protobuf-3.4.0

    centos终端输入：

cd protobuf-3.4.0
mkdir build20220119
cd build20220119
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local/protobuf -Dprotobuf_BUILD_TESTS=OFF -Dprotobuf_MSVC_STATIC_RUNTIME=OFF ../cmake
make
make install

    2.2 ncnn编译

　　下载网址：Tags · Tencent/ncnn (github.com)

　　我下载的ncnn-20211208

　　 centos终端输入：

cd ncnn-20211208 
mkdir -p build20220119
cd build20220119
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local/ncnn -DProtobuf_INCLUDE_DIR=/usr/local/protobuf/include -DProtobuf_LIBRARIES=/usr/local/protobuf/lib64/libprotobuf.a -DProtobuf_PROTOC_EXECUTABLE=/usr/local/protobuf/bin/protoc -DNCNN_VULKAN=OFF ..
make 
make install

　　ok,编译完成。