Main

h1. Building OpenCV

h2. Prerequisites

# Install CUDA: https://docs.nvidia.com/cuda/cuda-installation-guide-linux/

# Install cuDNN:

<pre>

$ sudo apt install libcudnn8 libcudnn8-dev

</pre>

# Install OpenCV prereqs:

<pre>

$ sudo apt install build-essential cmake git pkg-config libgtk-3-dev libavcodec-dev libavformat-dev libswscale-dev libv4l-dev libxvidcore-dev libx264-dev libjpeg-dev libpng-dev libtiff-dev gfortran openexr libatlas-base-dev python3-dev python3-numpy libtbb2 libtbb-dev libdc1394-22-dev libopenexr-dev libgstreamer-plugins-base1.0-dev libgstreamer1.0-dev libvtk7-dev libdc1394-dev

</pre>

h2. Build from source

# From a working directory clone the contrib repository:

<pre>

$ git clone https://github.com/opencv/opencv_contrib.git

</pre>

# "Download":https://github.com/opencv/opencv/releases/tag/4.7.0 OpenCV release (currently 4.7.0) to working directory and untar:

<pre>

$ wget https://github.com/opencv/opencv/archive/refs/tags/4.7.0.tar.gz

$ tar xf 4.7.0.tar.gz

</pre>

# Create build directory and enter it:

<pre>

$ mkdir biuld

$ cd build

</pre>

# Configure build (NOTE: this will set the install directory to @/opt/local@, change as needed):

<pre>

$ cmake -D CMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/opt/local -DOPENCV_GENERATE_PKGCONFIG=ON -DOPENCV_EXTRA_MODULES_PATH=../..//opencv_contrib/modules -DBUILD_opencv_legacy=OFF -DWITH_CUDA=ON -DBUILD_TESTS=OFF -DBUILD_PERF_TESTS=OFF -DBUILD_EXAMPLES=OFF -DBUILD_opencv_apps=OFF ..

</pre>

# Build (this will take a while) then install:

<pre>

$ make -j32

$ sudo make install

</pre>

h2. Miscellaneous

* To use the OpenCV Python bindings you need to set the @PYTHONPATH@ to include the install directory under @/opt/local@:

<pre>

$ export PYTHONPATH="/opt/local/lib/python3.10/dist-packages"

</pre>