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OpenCV OpenCV 教程

分类: IT文章 • 2023-11-18 12:57:48

http://www.opencv.org.cn/opencvdoc/2.3.2/html/doc/tutorials/tutorials.html#opencv

# Installation in Linux

Build core modules

# Install minimal prerequisites (Ubuntu 18.04 as reference)
sudo apt update && sudo apt install -y cmake g++ wget unzip
# Download and unpack sources
wget -O opencv.zip https://github.com/opencv/opencv/archive/master.zip
unzip opencv.zip
# Create build directory
mkdir -p build && cd build
# Configure
cmake ../opencv-master
# Build
cmake --build .

Build with opencv_contrib

# Install minimal prerequisites (Ubuntu 18.04 as reference)
sudo apt update && sudo apt install -y cmake g++ wget unzip
# Download and unpack sources
wget -O opencv.zip https://github.com/opencv/opencv/archive/master.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/master.zip
unzip opencv.zip
unzip opencv_contrib.zip
# Create build directory and switch into it
mkdir -p build && cd build
# Configure
cmake -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib-master/modules ../opencv-master
# Build
cmake --build .


By default OpenCV will be installed to the /usr/local directory, all files will be copied to following locations:


    

  • 
/usr/local/bin - executable files
    • 

  • 
/usr/local/lib - libraries (.so)
    • 

  • 
/usr/local/cmake/opencv4 - cmake package
    • 

  • 
/usr/local/include/opencv4 - headers
    • 

  • 
/usr/local/share/opencv4 - other files (e.g. trained cascades in XML format)
    • 



Since /usr/local is owned by the root user, the installation should be performed with elevated privileges (sudo):




sudo make install


 




Build samples




# C
export C_INCLUDE_PATH=/usr/local/include/opencv4:$C_INCLUDE_PATH
# CPP
export CPLUS_INCLUDE_PATH=/usr/local/include/opencv4:$CPLUS_INCLUDE_PATH


 


cd samples/cpp/example_cmake


mkdir build


cd build


cmake ..


make


 








http://www.opencv.org.cn/opencvdoc/2.3.2/html/doc/tutorials/introduction/linux_install/linux_install.html#linux-installation


https://docs.opencv.org/master/d7/d9f/tutorial_linux_install.html


 


Cross compilation for ARM based Linux systems


https://docs.opencv.org/3.4.13/d0/d76/tutorial_arm_crosscompile_with_cmake.html


 


# 环境变量


【1】include头文件路径
# C
export C_INCLUDE_PATH=XXXX:$C_INCLUDE_PATH
# CPP
export CPLUS_INCLUDE_PATH=XXX:$CPLUS_INCLUDE_PATH

【2】link链接库文件路径
-fPIC -shared
-fPIC -static
链接库文件的搜索路径指定有两种方式：1）修改/etc/so.ld.conf 2）修改环境变量，在其中添加自己的路径

1）在环境变量中添加
动态链接库搜索路径：
export LD_LIBRARY_PATH=XXX:$LD_LIBRARY_PATH
静态链接库搜索路径：
export LIBRARY_PATH=XXX:$LIBRARY_PATH
以上修改可以直接命令行输入（一次性），可以在/etc/profile中完成（对所有用户生效），也可以在用户home目录下的.bashrc或.bash_profile中添加（针对某个用户生效）,修改完后重新登录即生效。

2）在/etc/ld.so.conf 中添加指定的链接库搜索路径（需要root权限），然后运行 /sbin/ldconfig，以达到刷新 /etc/ld.so.cache的效果。

以上两种方式均可以达到指定链接库搜索路径的效果。



###


海思平台OpenCV编译与进一步裁剪


https://zhuanlan.zhihu.com/p/198457743?utm_source=org.mozilla.firefox_beta


 





															

																					

								

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