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OpenCV视频操作基础

VideoCapture作用是从视频文件或从摄像头捕获视频并显示出来

读取并播放视频

先实例化在初始化

VideoCapture capture;
capture.open("MV.mp4");
if (!capture.isOpened()){printf("Open ERROR!\n");return -1;}

循环读入视频帧

	Mat frame,gray,bin;double FPS = capture.get(CV_CAP_PROP_FPS);printf("FPS:%f",FPS);namedWindow("Video", CV_WINDOW_AUTOSIZE);while (capture.read(frame)){cvtColor(frame, gray, COLOR_BGR2GRAY);threshold(gray, bin, 0, 255, THRESH_BINARY | THRESH_OTSU);imshow("Video", bin);char c  =	waitKey(100);//100ms 返回值为当前键盘按键值 ESC ASCII码是27if (c == 27){break;}}

调用摄像头采集图像

区别仅仅是在VideoCapture类初始化对象时填入一个0。

VideoCapture capture;
capture.open(0);