Install OpenCV 3.4.4

install-OpenCV3.sh

#!/bin/sh

echo "OpenCV installation by learnOpenCV.com"

# Delete installed opencv in system.
apt-get uninstall libopencv-dev -y

#Specify OpenCV version
cvVersion="3.4.4"

# Clean build directories
rm -rf opencv/build
rm -rf opencv_contrib/build

# Create directory for installation
mkdir installation
mkdir installation/OpenCV-"$cvVersion"

# Save current working directory
cwd=$(pwd)

sudo apt -y update
sudo apt -y upgrade

sudo apt -y remove x264 libx264-dev

## Install dependencies
sudo apt -y install build-essential checkinstall cmake pkg-config yasm
sudo apt -y install git gfortran
sudo apt -y install libjpeg8-dev libpng-dev

sudo apt -y install software-properties-common
sudo add-apt-repository "deb http://security.ubuntu.com/ubuntu xenial-security main"
sudo apt -y update

sudo apt -y install libjasper1
sudo apt -y install libtiff-dev

sudo apt -y install libavcodec-dev libavformat-dev libswscale-dev libdc1394-22-dev
sudo apt -y install libxine2-dev libv4l-dev
cd /usr/include/linux
sudo ln -s -f ../libv4l1-videodev.h videodev.h
cd "$cwd"

sudo apt -y install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev
sudo apt -y install libgtk2.0-dev libtbb-dev qt5-default
sudo apt -y install libatlas-base-dev
sudo apt -y install libfaac-dev libmp3lame-dev libtheora-dev
sudo apt -y install libvorbis-dev libxvidcore-dev
sudo apt -y install libopencore-amrnb-dev libopencore-amrwb-dev
sudo apt -y install libavresample-dev
sudo apt -y install x264 v4l-utils

# Optional dependencies
sudo apt -y install libprotobuf-dev protobuf-compiler
sudo apt -y install libgoogle-glog-dev libgflags-dev
sudo apt -y install libgphoto2-dev libeigen3-dev libhdf5-dev doxygen

sudo apt -y install python3-dev python3-pip python3-venv
sudo -H pip3 install -U pip numpy
sudo apt -y install python3-testresources

cd $cwd
############ For Python 3 ############
# create virtual environment
#python3 -m venv OpenCV-"$cvVersion"-py3
#echo "# Virtual Environment Wrapper" >> ~/.bashrc
#echo "alias workoncv-$cvVersion=\"source $cwd/OpenCV-$cvVersion-py3/bin/activate\"" >> ~/.bashrc
#source "$cwd"/OpenCV-"$cvVersion"-py3/bin/activate
#
## now install python libraries within this virtual environment
#pip install wheel numpy scipy matplotlib scikit-image scikit-learn ipython dlib
# 
## quit virtual environment
#deactivate
######################################

git clone https://github.com/opencv/opencv.git
cd opencv
git checkout $cvVersion
cd ..
 
git clone https://github.com/opencv/opencv_contrib.git
cd opencv_contrib
git checkout $cvVersion
cd ..

cd opencv
mkdir build
cd build

cmake -D CMAKE_BUILD_TYPE=RELEASE \
            -D CMAKE_INSTALL_PREFIX=$cwd/installation/OpenCV-"$cvVersion" \
            -D INSTALL_C_EXAMPLES=ON \
            -D INSTALL_PYTHON_EXAMPLES=ON \
            -D WITH_TBB=ON \
            -D WITH_V4L=ON \
            -D OPENCV_PYTHON3_INSTALL_PATH=$cwd/OpenCV-$cvVersion-py3/lib/python3.6/site-packages \
        -D WITH_QT=ON \
        -D WITH_OPENGL=ON \
        -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \
        -D BUILD_EXAMPLES=ON ..
        
make -j$(nproc)
make install

Solve to build error from https://github.com/opencv/opencv_contrib/pull/1905/files/c4419e4e65a8d9e0b5a15e9a5242453f261bee46

diffFilterWidget.cpp:72:44: error: ‘COLOR_BGR2HSV’ was not declared in this scope

72, 73번 줄의 COLOR_BGR2HSV을 cv::COLOR_BGR2HSV 로 바꾼다.