How do I extract individual frames while taking video input from a webcam?

Here's a snippet of the program for Fall Detection which analyses a video clip frame-by-frame :

while ~isDone(vid)               % vid = vision.VideoFileReader(vidname);    where vidname is the filename of the video clip
    pause(0.0001);
    frame =  step(vid);
    frameNo = frameNo+1;
    

How do I edit it so that instead of a video clip the input is taken from my webcam?

Answer 1

[Saurabh Kumar]

You just need to create a VideoDevice System object (say vidobj) and replace vid with vidobj :

% Construct a VideoDevice System object associated with the Winvideo adaptor with device ID of 1.
vidobj = imaq.VideoDevice('winvideo', 1);           
    
while true                     % The program will run as long as the webcam is on.
    pause(0.0001);
    frame =  step(vidobj);
    frameNo = frameNo+1;
    

You can read more about acquiring frames through VideoDevice System object here :

https://in.mathworks.com/help/imaq/using-the-videodevice-system-object-to-acquire-frames.html

https://in.mathworks.com/help/imaq/imaq.videodevice.html