Examples of VideoCapture

code:

using namespace cv;

int main(int, char)

VideoCapture cap(0); // open the default camera

if(!cap.isOpened()) // check if we succeeded

return -1;

Mat edges;

namedWindow("edges",1);

for(;;)

Mat frame;

cap >> frame; // get a new frame from camera

cvtColor(frame, edges, CV_BGR2GRAY);

GaussianBlur(edges, edges, Size(7,7), 1.5, 1.5);

Canny(edges, edges, 0, 30, 3);

imshow("edges", edges);

if(waitKey(30) >= 0) break;

// the camera will be deinitialized automatically in VideoCapture destructor

return 0;

Note: In C API the black-box structure CvCapture is used instead of VideoCapture.

Note:

A basic sample on using the VideoCapture interface can be found at opencv_source_code/samples/cpp/starter_video.cpp
Another basic video processing sample can be found at opencv_source_code/samples/cpp/video_dmtx.cpp
(Python) A basic sample on using the VideoCapture interface can be found at opencv_source_code/samples/python2/video.py
(Python) Another basic video processing sample can be found at opencv_source_code/samples/python2/video_dmtx.py
(Python) A multi threaded video processing sample can be found at opencv_source_code/samples/python2/video_threaded.py