OpenCV (Study note 6)-Video reading and display

The reading of video mainly utilizes the Videocapture class in OpenCV. You can also make calls to the camera.

There are two ways to provide read-in video in the Videocapture class.

Instantiate and initialize first

VideoCapture capture;capture.open("Sugar.avi");

Initializing at the same time as instantiation

capture("Sugar.avi");

After the video is read into the Videocapture class object, it is immediately possible to display each frame with a loop.
Sugar.avi also needs to be placed in the directory as 1.jpg.

#include<opencv2/opencv.hpp>usingnamespace cv;int main(){    VideoCapture capture("Sugar.avi");    while(1)    {        Mat frame;        capture>>frame;        imshow("读取视频", frame);        if(waitKey(600)                break;    }    return0;}

The results of the operation are as follows:

Earlier in the study note 5 written about canny edge detection, in fact, in the video we can also add in. The code is as follows:

#include <opencv2/opencv.hpp>using namespaceCvintMain () {Videocapture capture ("Sugar.avi"); Mat edges; while(1) {Mat frame;        capture>>frame;        Cvtcolor (frame, edges, cv_bgr2gray); Blur (edges, edges, Size (7,7)); Canny (edges, edges,0, -,3); Imshow ("read Video", edges);if(Waitkey ( -) >=0) Break; }return 0;}

The results of the operation are as follows:

More learning materials about OPENCV and image processing and pattern recognition will continue to be updated, so stay tuned for this blog.

OpenCV (Study note 6)-Video reading and display