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How to Compile Opencv With Cmake?

4 minutes read

To compile OpenCV with CMake, you first need to create a build directory where the build files will be generated. Then, run CMake in that directory with the path to the OpenCV source code as an argument. This will generate the necessary build files for your specific platform and configuration.


After running CMake, you can use a build system like make to compile the OpenCV library by running the build commands in the build directory. Make sure to specify any additional options or parameters you may need during the build process.


Once the compilation is complete, you will have the OpenCV library compiled and ready to be used in your projects. You can link this library with your own code to utilize the functionality provided by OpenCV for computer vision and image processing tasks.


How to download OpenCV source code for compiling?

To download the OpenCV source code for compiling, you can follow these steps:

  1. Visit the official OpenCV website: https://opencv.org/
  2. Click on the "Download" tab in the top menu.
  3. Scroll down and click on the "Download Source" button.
  4. Choose the version of OpenCV that you want to download (e.g. 4.5.3).
  5. Save the downloaded .zip or .tar file to your computer.
  6. Extract the contents of the downloaded file to a folder on your computer.
  7. You now have the OpenCV source code ready for compiling.


You can compile the OpenCV source code using CMake and your preferred compiler (e.g. GCC, Visual Studio). Make sure to follow the installation instructions and documentation provided on the OpenCV website to successfully compile the source code.


How to compile OpenCV with C# bindings using CMake?

To compile OpenCV with C# bindings using CMake, follow these steps:

  1. Download and install CMake from the official website: https://cmake.org/download/
  2. Download the OpenCV source code from the official website: https://opencv.org/releases.html
  3. Create a new directory for building OpenCV with C# bindings, for example, mkdir build-csharp && cd build-csharp
  4. Run the CMake GUI and set the source code path to the OpenCV source directory and the build path to the directory created in step 3.
  5. Click on the "Configure" button and select your desired options, including enabling the C# bindings by adding the flag BUILD_opencv_csharp to true.
  6. Click on the "Generate" button to create the build files using the selected options.
  7. Open a terminal and navigate to the build directory created in step 3.
  8. Run the following command to build the OpenCV library with C# bindings: make -j4
  9. If the build process is successful, you can find the compiled OpenCV library with C# bindings in the build directory.
  10. You can now use the OpenCV library with C# bindings in your C# projects by referencing the generated DLL files in your project.


Note: Ensure that you have the necessary dependencies installed on your system before compiling OpenCV with C# bindings.


How to install CMake for compiling OpenCV?

To install CMake for compiling OpenCV, follow these steps:

  1. Download the latest version of CMake from the official website: https://cmake.org/download/
  2. Extract the downloaded archive to a directory on your computer.
  3. Open a terminal window and navigate to the directory where you extracted CMake.
  4. Run the following commands to configure and install CMake: ./bootstrap make sudo make install
  5. Verify that CMake has been successfully installed by running the following command in the terminal: cmake --version
  6. Now you can proceed with compiling OpenCV using CMake. Clone the OpenCV repository from GitHub and create a build directory: git clone https://github.com/opencv/opencv.git cd opencv mkdir build cd build
  7. Run the CMake command with the appropriate options to configure the build process: cmake ..
  8. Finally, compile OpenCV by running the following command: make
  9. Once the compilation process is complete, you can install OpenCV by running: sudo make install
  10. Verify that OpenCV has been successfully installed by running the following command: pkg-config --modversion opencv4


Now you have successfully installed CMake for compiling OpenCV.


How to compile OpenCV with OpenGL support using CMake?

To compile OpenCV with OpenGL support using CMake, follow these steps:

  1. Make sure you have CMake installed on your system. If not, you can download it from the CMake website.
  2. Download the OpenCV source code from the official OpenCV website.
  3. Create a new directory for building the OpenCV library. This directory should be different from the directory containing the source code.
  4. Open a terminal or command prompt and navigate to the directory where you created the build directory.
  5. Run the following CMake command to configure the build: 
1

cmake /path/to/opencv/source -DWITH_OPENGL=ON


Replace "/path/to/opencv/source" with the actual path to the directory containing the OpenCV source code.

  1. After running the CMake command, a Makefile or project file will be generated in the build directory.
  2. Now build the OpenCV library by running the following command: 
1

cmake --build .


This command will compile the OpenCV library with OpenGL support.

  1. Once the build process is complete, you can install the OpenCV library on your system by running:
1

sudo make install


Now you have successfully compiled the OpenCV library with OpenGL support using CMake. You can use this library in your projects that require OpenGL functionality.

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