Install make, g++, CMake and OpenCV on Windows

Installing g++ and make

1. Download the installer from here MSYS2
2. Follow the steps mentioned in the link above
3. After installating, in the Windows search bar, type 'settings' to open your Windows Settings.
4. Search for Edit environment variables for your account.
5. Choose the Path variable and then select Edit, click new and paste C:\msys64\mingw64\bin if the installation is done at the default location.
6. Again click new and paste C:\msys64\usr\bin which is the path for make.exe
7. Select OK to save the updated PATH. You will need to reopen any console windows for the new PATH location to be available.

Installing CMake

1. Install from Binary distributions from here CMake
2. Run the installer.
3. When asked for, select “Add CMake to the system PATH for all users”.
4. Complete the installation.
5. Reopen any console windows for the new PATH location to be available.

Installing OpenCV

OpenCV by default provides binaries to compile with visual studio which is available for download here

1. Download OpenCV for windows from above link by downloading opencv-4.5.3-vc14_vc15.exe from the link above and extract it in C:\opencv

Installing OpenCV from source to compile with MinGW on Windows

2. Next download the source code (zip) from the same above link and extract in desired folder
3. Inside the opencv-4.5.3 folder create a new folder named build.
4. In command prompt navigate to the above directory and type cmake -G "MSYS Makefiles" ..
5. Next type mingw32-make install. This will take time to complete.
6. Once it has completed navigate to C:\opencv-4.5.3\build\install\x64 and copy the folder mingw and paste it in the directory C:\opencv\build\x64 where you can see vc14 and vc15 folders.
7. Now add C:\opencv\build\x64 and C:\opencv\build\x64 to PATH by following the steps mentioned in the installation process for g++ and make
8. Reopen any console windows for the new PATH location to be available.

Alternate for building OpenCV from source

1. Download the zip file named mingw provided in the repository and extract the folder inside
2. Copy the folder mingw and paste it in the directory C:\opencv\build\x64 where you can see vc14 and vc15 folders.
3. Follow steps 7 and 8 from above.

Check proper Installation

1. Clone the repository using

git clone https://github.com/Abhishek-Nalawade/Installation-of-CMake-g-OpenCV-on-Windows

2. Create build folder.
3. cd build and type cmake -G "MSYS Makefiles" ..
4. Next type make and after completion type shell-app. This should display the image if the installation was successfull.
5. If the image is displayed OpenCV is now ready to be used with any other desired C++ projects with MinGW on windows.