Linux下用g++编译opencv程序

创建一个opencv程序，代码如下

test.cpp

#include 
#include 
#include 

using namespace cv;
using namespace std;

int main()
{
    //VideoCapture capture("video.aiv");//打开指定视频
    VideoCapture capture(0);//打开摄像头
    if (!capture.isOpened())//没有打开摄像头的话，就返回。
        return 1;
    Mat img1;
    Mat img_binary;
    while (true)
    {
        Mat frame;
        capture >> frame;
        cvtColor(frame, img1, CV_BGR2GRAY);//将原图转为灰阶图
        threshold(img1, img_binary, 100, 255, CV_THRESH_BINARY);//将灰度图转为二值图
        putText(frame, "Hello Word!!", Point(40, 60), FONT_HERSHEY_COMPLEX_SMALL, 2, Scalar(125, 125, 225), 1, 8, false);//显示字体在原图中
        imshow("原图", frame);
        imshow("灰度图", img1);
        imshow("二值图", img_binary);
        //waitKey(40);//等待40毫秒
        if (cvWaitKey(50) == 27){//按esc键退出
            IplImage tmp = IplImage(frame);
            CvArr* arr = (CvArr*)&tmp;
            cvSaveImage("Image.png", arr, 0);//保存当前屏幕上的图像到本地
            break;
        }
    }   
    return 0;
}

利用g++和pkg_conofig进行编译：

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