一、下载安装相关编译环境软件
1.1 Python3.8：安装路径:C:\Users\Administrator\AppData\Local\Programs\Python\Python38-32 安装包：python3.8.exe
1.2 QT5.14.2：安装路径:C:\Qt\Qt5.14.2
1.3 opencv4.5：解压路径D:\opencv\；安装包：opencv-4.5.0-vc14_vc15.exe
1.4 cmake-3.24：安装路径:C:\Program Files\CMake 安装包：cmake-3.24.0-win32-x86.exe
1.5 Java18：安装路径:C:\Program Files\Java\jdk-18.0.1 安装包：JavaSEDevelopmentKit.exe
二、打开我的电脑属性，设置环境变量Path包含如下配置：
C:\Program Files\CMake\bin;
C:\Qt\Qt5.14.2\5.14.2\mingw73_64\bin;
C:\Qt\Qt5.14.2\Tools\mingw73_64\bin;
C:\opencv\build\x64\vc15\bin;
3、打开CMake软件进行配置
点击 Configure，设置编译器
Specify the generator for this project: MinGW Makefiles
Specify native compilers
Next
Compilers C: C:/Qt/Qt5.14.2/Tools/mingw730_64/bin/gcc.exe
Compilers C++: C:/Qt/Qt5.14.2/Tools/mingw730_64/bin/g++.exe
Finish
设置源码位置：D:/opencv/sources
设置生成项目位置：D:/opencv/build_mingw64
点击Configure按钮后配置对应选项
WITH_OPENGL 勾选
WITH_QT 不勾选
OPENCV_ENABLE_ALLOCATOR_STATS 不勾选
WITH_OPENCL_D3D11_NV 不勾选
其中：OPENCV_VS_VERSIONINFO_SKIP需要点击Add Entry按钮手工新增,OPENCV_VS_VERSIONINFO_SKIP BOOL 1.
4、下载ffmpeg文件到指定位置
存放地址：
D:\opencv\build_mingw64\3rdparty\ffmpeg\ffmpeg_version.cmake
D:\opencv\build_mingw64\3rdparty\ffmpeg\opencv_videoio_ffmpeg.dll
D:\opencv\build_mingw64\3rdparty\ffmpeg\opencv_videoio_ffmpeg_64.dll
5、编译项目文件：
点击Generate按钮后，生成项目文件完成。
6、开始菜单中打开Qt目录下的mingw64菜单，进入编译窗口。
中跳转到到指定目录，执行下面命令：
D:\opencv\build_mingw64>mingw32-make -j 8
D:\opencv\build_mingw64>mingw32-make install
编译到68%时候会出错，需要运行新的mingw64窗口，执行命令
切换目录cd D:\opencv\build_mingw64\modules\word\CMakeFiles\opencv_world.dir
执行指令：C:\Qt\Qt5.14.2\Tools\mingw730_64\bin\windres.exe D:\opencv\build_mingw64\modules\world\vs_version.rc -O coff .\vs_version.rc.obj
日志记录如下：
D:\opencv\build_mingw64\modules>cd world
D:\opencv\build_mingw64\modules\world>cd CMakeFiles
D:\opencv\build_mingw64\modules\world\CMakeFiles>cd opencv_world.dir
D:\opencv\build_mingw64\modules\world\CMakeFiles\opencv_world.dir>C:\Qt\Qt5.14.2\Tools\mingw730_64\bin\windres.exe .\vs_version.rc -O coff .\vs_version.rc.obj
gcc: error: .\vs_version.rc: No such file or directory
gcc: warning: '-x c' after last input file has no effect
gcc: fatal error: no input files
compilation terminated.
C:\Qt\Qt5.14.2\Tools\mingw730_64\bin\windres.exe: preprocessing failed.
D:\opencv\build_mingw64\modules\world\CMakeFiles\opencv_world.dir>C:\Qt\Qt5.14.2\Tools\mingw730_64\bin\windres.exe D:\opencv\build_mingw64\modules\world\vs_version.rc -O coff .\vs_version.rc.obj
D:\opencv\build_mingw64\modules\world\CMakeFiles\opencv_world.dir>mingw32-make.exe -j 8
mingw32-make.exe: *** No targets specified and no makefile found. Stop.
D:\opencv\build_mingw64\modules\world\CMakeFiles\opencv_world.dir>cd ../../../
D:\opencv\build_mingw64\modules>mingw32-make.exe -j 8
直到正确编译结束后，执行安装指令：mingw32-make install
至此完成opencv对应的mingw-64版本软件的编译和安装