ImageProcee_CPP_WSL

This is a practice to use the openCV with C/C++in WSL2 platform.

Setting OpenCV and print the image

ref: Using OpenCV C++ on Windows Subsystem for Linux (WSL)

1. Update and Install Dependencies

Launch your Linux distribution and use the following commands to update your package manager and install the required dependencies for compiling OpenCV:

sudo apt-get install build-essential libgtk2.0-dev libgtk-3-dev libavcodec-dev libavformat-dev libjpeg-dev libswscale-dev libtiff5-dev

2. Download OpenCV and OpenCV Contrib Source Code

Download the OpenCV and OpenCV Contrib source code from the OpenCV GitHub repository:

mkdir ~/opencv_build && cd ~/opencv_build
git clone https://github.com/opencv/opencv.git
git clone https://github.com/opencv/opencv_contrib.git

Ensure both repositories are on the same version:

cd ~/opencv_build/opencv
git checkout 4.x
cd ../opencv_contrib
git checkout 4.x

3. Compile and Install OpenCV:

cd ~/opencv_build/opencv
mkdir build
cd build
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 ..
make -j$(nproc)
sudo make install

4. Configure Environment Variables :

To ensure the compiler can find the OpenCV libraries, you need to update the LD_LIBRARY_PATHenvironment variable. Add the following line to your~/.bashrc or ~/.profilefile:

5. 將opencv2的資料夾連結到include資料夾下

sudo ln -s /usr/include/opencv4/opencv2 /usr/include

6. 編寫Makefile

需要將以下文件添加到連結庫中:

• -lopencv_core
• -lopencv_highgui
• -lopencv_imgproc
• -lopencv_imgcodecs

Warning!! 在一般網路上的寫法不包含 "-lopencv_imgcodecs"，但在編譯後會出現 'undefined reference to cv::imread(std::__cxx11::basic_string… 对‘cv::imread(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, int)'的錯誤 (ref: 编译连接imread报错undefined reference to cv::imread(std::__cxx11::basic_string)

main: main.cpp
	g++ main.cpp -o main -lopencv_core -lopencv_highgui -lopencv_imgproc -lopencv_imgcodecs


clean:
	rm -rf main

7. 執行main

./main