linux编译opencv3

sudo apt-get update
sudo apt-get install build-essential cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

git clone https://github.com/opencv/opencv.git
cd opencv
git checkout 3.4.18  # 切换到特定版本

mkdir build
cd build

cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..

make -j$(nproc)  # 使用所有CPU核心加速编译
sudo make install

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

int main() {
    cv::Mat image = cv::imread("path_to_image.jpg");
    if (image.empty()) {
        std::cout << "Could not open or find the image" << std::endl;
        return -1;
    }
    cv::imshow("Display window", image);
    cv::waitKey(0);
    return 0;
}

g++ -o my_program my_program.cpp `pkg-config --cflags --libs opencv`

./my_program