ubuntu 18.04 使用c++ opencv读取摄像头或视频

#include
using namespace cv;
int main(int argc,char *argv[])
{
	
        char  ch[10] = {'W','A','N','G',' ','T','E','S','T','\0'};
	char  te[100] = "test opencv camera";
	//从硬盘上打开视频
	cv::VideoCapture capture;
	capture.open(argv[1]);
	//循环显示每一
	Mat frame,gray;//定义一个Mat变量，用于存储每一的图像
	Size size = Size(capture.get(CV_CAP_PROP_FRAME_WIDTH), capture.get(CV_CAP_PROP_FRAME_HEIGHT));
    	VideoWriter writer;
    	writer.open("final.avi", CV_FOURCC('M', 'J', 'P', 'G'), 10, size, true);
		cv::Point p = cv::Point(10, 400);
	while (capture.read(frame))
	{
	//	capture>>frame;//读取当前帧
	//	cvtColor(frame,gray,COLOR_BGR2GRAY);
        //二值化处理
                //threshold(gray, gray, 0, 255, THRESH_BINARY | THRESH_OTSU);
		// cvtColor(gray, gray, COLOR_GRAY2BGR);
		 putText(frame, te, p, FONT_HERSHEY_SIMPLEX, 2, Scalar(0, 100, 100), 2, CV_AA);

		imshow("读取视频帧",frame);//显示当前顿
		writer.write(frame);
		waitKey(200);//延时30ms
	}
	system("pause");
	return 0;
}

编译

  g ++ -o test_1 test_1.cpp`pkg-config opencv --cflags --libs`

执行

./test /dev/video0

结果