OpenCV 소스 빌드

기본 패키지 설치

# Install minimal prerequisites (Ubuntu 18.04 as reference)
sudo apt update && sudo apt install -y cmake g++ wget unzip
sudo apt-get install -y qtbase5-dev qtdeclarative5-dev

Mac

alias nproc="sysctl -n hw.logicalcpu"
brew install ninja

git clone https://github.com/opencv/opencv.git
mkdir build/
mkdir install/
cd build
cmake -DCMAKE_BUILD_TYPE=Release -D BUILD_ZLIB=OFF -DCMAKE_INSTALL_PREFIX=../install -GNinja ../opencv
time ninja

명령어 (only opencv)

git clone https://github.com/opencv/opencv.git
mkdir build/
mkdir install/
cd build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=../install ../opencv
make -j"$(nproc)"
sudo make install

명령어 v2 (opencv + contrib)

# Download and unpack sources
wget -O opencv.zip https://github.com/opencv/opencv/archive/4.x.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.x.zip
unzip opencv.zip
unzip opencv_contrib.zip
# Create build directory and switch into it
mkdir -p build && cd build
# Configure
cmake -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib-4.x/modules ../opencv-4.x
# Build
cmake --build .

명령어 v3 (opencv + contrib + python)

wget -O opencv.zip https://github.com/opencv/opencv/archive/4.x.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.x.zip
unzip opencv.zip
unzip opencv_contrib.zip
mkdir build/
mkdir install/
cd build
cmake -DCMAKE_BUILD_TYPE=Release -D BUILD_NEW_PYTHON_SUPPORT=ON -D BUILD_opencv_python3=ON -D HAVE_opencv_python3=ON -DPYTHON_DEFAULT_EXECUTABLE=$(which python3) -DCMAKE_INSTALL_PREFIX=../install -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib-4.x/modules ../opencv-4.x
make -j"$(nproc)"
sudo make install

명령어 v4 (opencv + contrib + cuda)

wget -O opencv.zip https://github.com/opencv/opencv/archive/4.5.5.zip
wget -O opencv_contrib.zip https://github.com/opencv/opencv_contrib/archive/4.5.5.zip
unzip opencv.zip
unzip opencv_contrib.zip
mkdir build/
mkdir install/
cd build
cmake -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=../install -DWITH_CUDA=ON -DENABLE_FAST_MATH=1 -DCUDA_FAST_MATH=1 -DWITH_CUBLAS=1 -DBUILD_opencv_cudacodec=OFF -DWITH_QT=ON -DWITH_OPENGL=ON -DFORCE_VTK=OFF -DWITH_TBB=OFF -DWITH_MKL=ON -DMKL_USE_MULTITHREAD=ON -DMKL_WITH_TBB=ON -DWITH_IPP=ON -DWITH_GDAL=ON -DWITH_XINE=OFF -DBUILD_EXAMPLES=OFF -DCUDA_ARCH_PTX="" -DCUDA_ARCH_BIN="6.2" -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules ../opencv
make -j"$(nproc)"
sudo make install

설치 완료

 

참고

OpenCV: Installation in Linux

https://docs.opencv.org/4.x/d7/d9f/tutorial_linux_install.html

how to build opencv for python3 when both python2 and python3 are installed

I was trying to build opencv for python3. However, cmake always sets python build option to be python2.7.11 even after I manually specified include and lib option for python3: -- Python 2: ...

https://stackoverflow.com/questions/37070304/how-to-build-opencv-for-python3-when-both-python2-and-python3-are-installed

예제 코드 실행

#include "opencv2/opencv.hpp"
#include <iostream>

using namespace std;

int main()
{
    cout << CV_VERSION << endl;
    return 0;
}