如何用CMake和DevCPP编译OpenCV4？

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使用CMake版本3.19.2和OpenCV版本4.5.0进行编译，请访问以下链接获取源码：- OpenCV: [https://codeload.github.com/opencv/opencv/zip/4.5.0](https://codeload.github.com/opencv/opencv/zip/4.5.0)- OpenCV Contrib: [https://codeload.github.com/opencv/opencv_contrib/zip/4.5.0](https://codeload.github.com/opencv/opencv_contrib/zip/4.5.0)

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一、准备工作​

cmake 版本3.19.2​

opencv-4.5.0 ​​codeload.github.com/opencv/opencv/zip/4.5.0​​ ​

opencv-contrib-4.5.0 ​​codeload.github.com/opencv/opencv_contrib/zip/4.5.0​​ cmake编译​

二、解压文件、创建build文件夹​

设置环境变量​

OPENCV_DIR=D:\opencv\build\install​

OPENCV_PATH=D:\opencv​

PATH 末尾加入​D:\CMake\bin;D:\Dev-Cpp\MinGW64\bin;D:\opencv\build\bin​

三、设置opencv​
运行cmake-gui​

点击第一次Configure 会出现选择版本界面。