opencv学习笔记（4）---- 读取视频；调用摄像头；Canny边缘检测

读取视频

#include <opencv2\opencv.hpp>
using namespace cv;

int main() 
{
    VideoCapture capture("1.avi");
while (1)
    {
        Mat frame;
        capture >> frame;
        imshow("读取视频", frame);
        waitKey(30);
    }
return 0;
}

调用摄像头

#include <opencv2\opencv.hpp>
using namespace cv;
int main()
{
//从摄像头读入视频
    VideoCapture capture(0);
    Mat edges;

//循环显示每一帧
    while (1)
    {
        Mat frame;
        capture >> frame;   //读取当前帧
cvtColor(frame, edges, CV_BGR2GRAY);  //转换为灰度图
blur(edges, edges, Size(7, 7));     //模糊降噪
Canny(edges, edges, 0, 30, 0);      //边缘检测并显示
imshow("读取视频", edges);
waitKey(30);
    }
    return 0;
}

效果如图