With-CUDA.md

Pre Requirements

• If OpenCV has been installed previously, remove it using sudo apt purge libopencv*.
• Install some dependancy as follow:

  ~$ sudo apt install cmake libavcodec-dev libavformat-dev libavutil-dev \
      libeigen3-dev libglew-dev libgstreamer-plugins-base1.0-dev libgstreamer1.0-dev \
      libgtk2.0-dev libgtk-3-dev libjpeg-dev libpng-dev libpostproc-dev \
      libswscale-dev libtbb-dev libtiff5-dev libv4l-dev libxvidcore-dev libx264-dev \
      python-dev python-numpy python-py python-pytest \
      python3-dev python3-numpy python3-py python3-pytest \
      pkg-config qt5-default zlib1g-dev

Build Process

Clone OpenCV and OpenCV_Contrib Repository

• Clone this repository https://github.com/opencv/opencv.git.
• Clone this repository https://github.com/opencv/opencv_contrib.
• Change the branch to the most recent 4.2 version (the last version used was 4.2.0).

Build OpenCV

• Create build directory inside OpenCV repository and cd to that directory.
• Create Makefiles with the following options:

  ~$ cmake -D CMAKE_BUILD_TYPE=RELEASE \
      -D CMAKE_INSTALL_PREFIX="/usr/local/" \
      -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
      -D WITH_CUDA=ON \
      -D CUDA_ARCH_BIN=${ARCH_BIN} \
      -D CUDA_ARCH_PTX="" \
      -D ENABLE_FAST_MATH=ON \
      -D CUDA_FAST_MATH=ON \
      -D WITH_CUBLAS=ON \
      -D WITH_LIBV4L=ON \
      -D WITH_GSTREAMER=ON \
      -D WITH_GSTREAMER_0_10=OFF \
      -D WITH_QT=ON \
      -D WITH_OPENGL=ON \
      -D WITH_OPENCL=ON \
      -D BUILD_opencv_python2=OFF \
      -D BUILD_opencv_python3=OFF \
      OPENCV_GENERATE_PKGCONFIG=YES \
      ..

• Build OpenCV with make -j$(nproc) command.

Note: If there is a problem with OpenGL support, fix it with creating a new patch file which contain the following text:

diff --git a/cuda_gl_interop.h b/cuda_gl_interop.h
index 0f4aa17..e8c538c 100644
--- a/cuda_gl_interop.h
+++ b/cuda_gl_interop.h
@@ -59,13 +59,13 @@

 #else /* __APPLE__ */

-#if defined(__arm__) || defined(__aarch64__)
-#ifndef GL_VERSION
-#error Please include the appropriate gl headers before including cuda_gl_interop.h
-#endif
-#else
+//#if defined(__arm__) || defined(__aarch64__)
+//#ifndef GL_VERSION
+//#error Please include the appropriate gl headers before including cuda_gl_interop.h
+//#endif
+//#else
#include <GL/gl.h>
-#endif
+//#endif

 #endif /* __APPLE__ */

And then patch cuda_gl_interop.h header inside CUDA's header directory using sudo patch -N <header_file> <patch_file> command.

Note: If there is a problem with Eigen header, make sure that it has been installed. If it has been installed, check the include directory of Eigen/, OpenCV expects that it is placed in the root. If it is placed in another directory (example in eigen3/Eigen/), create symbolic link of that place to Eigen/ using ln -s <source_directory> <target_directory> command.

Post Install

Configure OpenCV Library Path

• Create new file opencv.conf inside /etc/ld.so.conf.d/ and fill it with the following text:

  /usr/local/lib
  

• Reload library path using sudo ldconfig command.

Build OpenCV-python

• Install OpenCV-python using pip

  ~$ sudo pip install opencv-python