Raspbian/Ubuntu - Opencv installation

There are two ways to install opencv on ubuntu

1. Direct method(opencv Package )

2. install from source

Building the OpenCV library from source is the recommended way of installing OpenCV. The following steps should follow for installation.

Step 1.

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

Step2.

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

Step3.

mkdir ~/opencv_build && cd ~/opencv_build

cd ~/opencv_build/opencv

mkdir build && cd build

Step4.

sudo cmake -D CMAKE_BUILD_TYPE=RELEASE \ -D CMAKE_INSTALL_PREFIX=/usr/local \ -D INSTALL_C_EXAMPLES=ON \ -D INSTALL_PYTHON_EXAMPLES=ON \ -D OPENCV_GENERATE_PKGCONFIG=ON \ -D OPENCV_EXTRA_MODULES_PATH=~/opencv_build/opencv_contrib/modules \ -D BUILD_EXAMPLES=ON ..

Step5.

sudo make -j4

sudo make install

step6; To check installed version

pkg-config --modversion opencv4

Thats all , Before installation of opencv python3 environment must be installed.