Compile OpenCV from source

build_opencv.sh

#!/bin/bash

# Tested on
# ------------------------------
# OS                Ubuntu 18.04
# Platform          x86_64, aarch64
# Python            3.6

if [ $# != 1 ]; then
	echo -e "Usage:\n\t./build_opencv.sh VERSION\n\nExample:\n\t./build_opencv.sh 4.2.0"
	exit 1
fi

VERSION=$1

ROOT=`pwd`
SOURCE_DIR=$ROOT/source
INSTALL_DIR=$ROOT/install
PLATFORM=`uname -p`

mkdir -p $SOURCE_DIR
mkdir -p $INSTALL_DIR

sudo apt update
sudo apt install build-essential
sudo apt install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
sudo apt install python3-dev python3-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev

if [ ! -d $SOURCE_DIR/opencv ]; then
	cd $SOURCE_DIR
	git clone https://github.com/opencv/opencv.git
fi

if [ ! -d $SOURCE_DIR/opencv_contrib ]; then
	cd $SOURCE_DIR
	git clone https://github.com/opencv/opencv_contrib.git
fi

cd $SOURCE_DIR/opencv
git checkout $VERSION
cd $SOURCE_DIR/opencv_contrib
git checkout $VERSION

mkdir -p $ROOT/build/opencv-$VERSION
cd $ROOT/build/opencv-$VERSION

cmake $SOURCE_DIR/opencv \
	-DCMAKE_BUILD_TYPE=Release \
	-DCMAKE_INSTALL_PREFIX=$INSTALL_DIR \
	-DOPENCV_EXTRA_MODULES_PATH=$SOURCE_DIR/opencv_contrib/modules \
	-DOPENCV_ENABLE_NONFREE=ON \
	-DWITH_CUDA=ON \
	-DWITH_FFMPEG=ON \
	-DWITH_GSTREAMER=ON \
	-DBUILD_opencv_cudacodec=OFF \
	-DBUILD_opencv_python2=OFF \
	-DBUILD_opencv_python3=ON \
	-DPYTHON_PACKAGES_PATH=$INSTALL_DIR/python \
	-DPYTHON_DEFAULT_EXECUTABLE=/usr/bin/python3.6 \
	-DPYTHON3_EXECUTABLE=/usr/bin/python3.6 \
	-DPYTHON3_INCLUDE_DIR=/usr/include/python3.6m \
	-DPYTHON3_LIBRARY=/usr/lib/$PLATFORM-linux-gnu/libpython3.6m.so.1.0 \
	-DPYTHON3_NUMPY_INCLUDE_DIRS=/usr/local/lib/python3.6/dist-packages/numpy/core/include \
	-DBUILD_DOCS=OFF \
	-DBUILD_EXAMPLES=OFF \
	-DBUILD_TESTS=OFF

make -j8
make install